JP2005309370A - Optical module, optical multiplexer / demultiplexer, and optical multiplexer / demultiplexer unit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-function and low-cost optical transmission / reception module used in a metro / access optical communication network which can cope with three-wave multiplexing or more and can be easily aligned.
In this module, light having a wavelength of 1.3 μm from a laser diode 2 in a housing 1 is condensed with a condenser lens 10 and a capillary 14 (having a function of correcting an angular deviation from the optical axis of the diode 2), The light is reflected by the total reflection wavelength filter 6 and the wavelength separation filter 8 through the collimator lens 13 and received by the fiber collimator 5, and the light from the collimator 5 having a wavelength of 1.49 μm and a wavelength of 1.55 μm Is separated by the wavelength separation filter 8 acting as a total reflection mirror for the 1.55 μm light, and the 1.55 μm light is folded by the total reflection wavelength filter 7 and is coupled to the photodiode by the coupling lens 11. 3 and light of 1.49 μm is incident on the photodiode 4 by the coupling lens 12.
[Selection] Figure 1

Description

  INDUSTRIAL APPLICABILITY The present invention is mainly applied in the field of optical communication where high speed and large capacity are required, and is used for optical signal transmission / reception in a metro access system, as well as optical signal multiplexing or The present invention relates to an optical multiplexer / demultiplexer used for demultiplexing and an optical multiplexing / demultiplexing unit using the same.

  Compared to the awakening of the progress of optical communication in backbone systems such as long-distance backbone systems on land or submarine optical cable systems, optical access in metro access systems has not progressed as expected. is there. In addition, there is a dilemma that investment in the backbone system to make up for the increase in traffic will not progress due to the lack of progress in optical communication in the metro access system.

  In order to eliminate this dilemma and increase investment in optical communications for backbone and metro access systems, how to make optical transceiver modules for subscribers cheaper, and broadband services based on optical communications It is indispensable to let subscribers know that is suitable for full service and multi-service.

  Aside from the point of service, lowering the price of optical transceiver modules is a core issue in realizing the fiber-to-the-home (FTTH) concept of extending the optical fiber network from the 1980s to ordinary homes. there were. It has been realized as a low-priced product, currently called the media converter.

  However, in the broadband service using the media converter, the upstream digital signal from the subscriber side (the optical wavelength of 1.3 μm is used) and the downstream digital signal from the station side (optical wavelength 1. 5 μm is used), and the wavelength division multiplexing (WDM) is used to carry two wavelengths, and the conventional scheme has not been able to provide a moving image with the highest definition that is most attractive to the subscriber.

  Distribution of video (video, high-definition video, etc.) to subscribers that is about to start from now on is to be performed by optical signals with a wavelength of 1.55 μm that can be transmitted over long distances by optical fiber amplifiers. As much as possible, an upstream signal from a subscriber (having a wavelength of 1.3 μm), a downstream digital signal (having a wavelength of 1.49 μm slightly shorter than the current downstream signal wavelength), and a video signal It is considered desirable to provide a service in a three-wave multiplex manner (having both analog and digital wavelengths of 1.55 μm). This is because the optical fiber is newly laid and duplexed only for the video signal because the equipment burden on the telecommunications carrier and the subscriber is large, which becomes a major obstacle to the spread.

  In order to perform three-wave multiplexing transmission with one optical fiber, it is necessary to add a three-wave multiplexing / demultiplexing function to the optical transceiver module on the subscriber side. Conventionally known upstream and downstream digital signals can be handled by a known media converter after separating a video signal (having a wavelength of 1.55 μm) with a high extinction ratio. Such a media converter is a device that incorporates an optical transmission / reception module that supports two-wave multiplexing transmission, and also includes electrical and electronic circuits for driving and signal output. In other words, the multiplexing / demultiplexing of the three waves is performed by first separating the video signal with a high extinction ratio and processing the remaining signals having a wavelength of 1.3 μm and a wavelength of 1.49 μm by a known media converter. The separated video signal is input to a dedicated light receiver and converted into an electrical signal, and is further connected to the TV via a device called a dedicated set-top box. A dedicated receiver may be built into the set-top box.

  For this purpose, commercialization of a WDM filter module for separating a video signal is progressing, and a service is going to be performed by combining the WDM filter module, a media converter, and a video signal device. . However, the separation WDM filter module includes a two-core fiber collimator, a dielectric multilayer filter, and a one-core fiber, as in the high-density wavelength division multiplexing (DWDM) multiplexing / demultiplexing filter used in the long-distance trunk line system. It is manufactured by aligning the collimator (showing the operation of aligning the optical axes between the optical elements in the same manner as described below) and fixing the collimator to the holder by a highly reliable fixing method. Therefore, it is a very expensive module for use in a subscriber system. Contrary to the progress in lowering the price of media converters, it is strongly demanded to lower the price of WDM filter modules. On the other hand, the high cost of WDM filter modules is never desirable.

  As a method for coping with the increase in cost of the WDM filter module, there is a method that can be easily analogized to incorporate a video signal separation WDM filter in a media converter. In a new media converter with a built-in video separation WDM filter, it is desirable that the extinction ratio of a signal having a wavelength of 1.55 μm and a wavelength of 1.49 μm be 30 dB or more. Therefore, an optical waveguide type using a so-called passive alignment technique. A module or a fiber embedded type module cannot be easily handled, and a micro-optics type module using an active alignment method that performs alignment while operating a light emitting / receiving element is considered suitable.

  As a conventional micro-optics type optical transceiver module built in the media converter, for example, one having a configuration as shown in FIG. 22 (already developed but not a known invention) is cited.

  In this optical transmission / reception module, the light having an upstream wavelength of 1.3 μm emitted from the laser diode 111 in the housing 110 is converted into parallel light by the collimator lens 115 and passes through the WDM filter 114 as it is. The light enters the fiber collimator 113. In contrast, light having a wavelength of 1.5 μm downstream from the station building is emitted as parallel light from the fiber collimator, reflected by the WDM filter 114, and incident on the light receiving photodiode 112 by the condenser lens 116.

  The WDM filter 114 used here is a low-pass filter that functions as a wavelength separation filter that transmits light having a wavelength of 1.3 μm and reflects light having a wavelength of 1.5 μm, and has a performance of 200 nm. There is room for it. In addition, since the photodiode 112 for receiving light can also have a function of selectively receiving light having a wavelength of 1.5 μm, crosstalk is achieved regardless of the alignment of the WDM filter 114, the laser diode 111, and the photodiode 112. The alignment work can be performed without worrying about the extinction ratio. Of course, the WDM filter 114 may have a structure in which a high-pass filter having characteristics in which the relationship between transmission and reflection with respect to light having a wavelength of 1.3 μm and a wavelength of 1.5 μm is reversed is substituted.

  On the other hand, as a wavelength division multiplexing optical multiplexer / demultiplexer used for multiplexing or demultiplexing optical signals in a conventional wavelength division multiplexing communication system, for example, a small piece of GI fiber (refractive index distribution type multimode fiber) is attached to the tip. The single-mode optical fiber is optically arranged with two sets in one set of dielectric multilayer filters and one set in the other set so that the tip of each GI fiber faces the direction of the dielectric multilayer filter. There is a known configuration (see Patent Document 1).

  Further, as an optical multiplexer / demultiplexer having a function of multiplexing or demultiplexing an optical signal, for example, one having a configuration as shown in FIG. It is done.

  This optical multiplexer / demultiplexer includes one fiber collimator 501 having one input / output port on one side in a wavelength filter 498 having one wavelength selection function, and 2 having one input / output port on the other side. Two fiber collimators 499, 500 are provided, and light of two different wavelengths λ1, λ2 is separately incident from the two fiber collimators 499, 501 and multiplexed into one fiber collimator 500 via the wavelength filter 498, Alternatively, it is possible to enter and exit in both directions by entering from one fiber collimator 500 and demultiplexing into two fiber collimators 499 and 501 via a wavelength filter 498.

  In addition, an optical multiplexer / demultiplexer corresponding to the case where the number of wavelength multiplexing is 8 is also known (see Non-Patent Document 1, for example).

  Hereinafter, the optical multiplexer / demultiplexer disclosed in Non-Patent Document 1 will be described with reference to FIG. This optical multiplexer / demultiplexer is called an optical coupler, and is configured to correspond to the case where the number of wavelength multiplexing is 8 wavelengths by arranging in multiple stages.

  In other words, the optical multiplexer / demultiplexer includes a first fiber collimator 578 and a second fiber collimator 578 on one side of a housing 577 in which a first wavelength filter 581 and a second wavelength filter 582 are disposed. A fiber collimator 579 is provided, and a third fiber collimator 580 is provided on the other side. Each of these fiber collimators 578 to 580 functions as an optical signal input / output unit including a lens and an optical waveguide.

  The first wavelength filter 581 disposed in the housing 577 has a function of transmitting only the optical signal having the first wavelength λ1 having a predetermined wavelength range.

  As shown in FIG. 24, the first fiber collimator 578 inputs and outputs optical signals having wavelengths λ1, λ2,..., Λm from the first wavelength to the m-th (m is an integer of 2 or more). Is for. The second fiber collimator 579 is for inputting and outputting optical signals having the second to m-th wavelengths λ2,. The third fiber collimator 580 is for entering / exiting an optical signal having the first wavelength λ1.

  The optical multiplexer / demultiplexer having such a configuration has a function of demultiplexing or multiplexing an optical signal having the first wavelength λ1 with respect to an optical signal having another wavelength. The second wavelength filter 582 added in the housing 577 has a function similar to that of the first wavelength filter 581, and this is the optical signal of the first wavelength λ 1 by the first wavelength filter 581. This is to increase the selection ratio when the selection ratio is not sufficient. A two-core collimator is usually used for the fiber collimators 578 and 579 placed on one side of the housing 577.

Japanese Patent Laid-Open No. 11-38262 (Abstract, FIGS. 1 and 3) Denpa Shimbun 948 (issued September 5, 2002, pages 24 to 25)

  In the case of the optical transmission / reception module shown in FIG. 22 described above, some problems arise when an attempt is made to add a WDM filter for video signal separation. The following will be specifically examined and considered.

  First, when the light having the wavelength of 1.3 μm, the light having the wavelength of 1.49 μm and the wavelength of 1.55 μm is separated and the extinction ratio with the wavelength of 1.49 μm is kept high, the light receiving sensitivity of the wavelength of 1.55 μm is increased. It is necessary to align and fix the separation WDM filter and the emission port (a combination of a condensing lens and a photodiode or a fiber collimator) with a wavelength of 1.55 μm with high accuracy. The alignment work at this time is performed while making light having a wavelength of 1.55 μm and a wavelength of 1.49 μm incident from the fiber collimator. In order to perform alignment work with high accuracy, a micrometer for positioning each optical element with high accuracy is required, and a space for independently handling each optical element is also required. Of course, micrometers for performing these alignments are easily available at a relatively low cost, and the technology for positioning with high accuracy is within the scope of general-purpose technology. Then it doesn't matter.

  Next, with respect to the light that has passed through the WDM filter for separating the video signal, the space from the fiber collimator to the laser diode and the photodiode can be set, for example, by taking a space to perform alignment with high accuracy. Whereas it is about 10 mm, it can be increased to about 30 mm. For photodiodes that receive light with a wavelength of 1.49 μm, if the cross-sectional area of the light receiving portion is relatively large (approximately aperture φ = 50 μm), the incident angle Alignment is not so difficult due to the small dependence. Here, it is effective to utilize a technique for positioning with high accuracy as in the case described above.

  Furthermore, the cross-sectional area of the light emitting part of the laser diode is about φ = 10 μm, and the coupling efficiency to the fiber collimator depends greatly on the light emission angle from the light emitting part, and depends on the distance between the laser diode and the fiber collimator. On the other hand, the coupling efficiency tends to decrease exponentially. Therefore, even if the light emitted from the laser diode is converted into parallel light by the collimator lens, the alignment becomes very large if the distance to the fiber collimator to be coupled is large. It becomes difficult. That is, if the light from the laser diode is to be aligned, it becomes difficult to manufacture a micro-optics module having a structure incorporating a WDM filter for video signal separation.

  In addition, as a requirement from the electric / electronic circuit side, in the conventional module, the laser diode and photodiode drive circuits can be installed relatively close to the optical elements, specifically on the same substrate. Although the drive circuit can be arranged, the laser diode and photodiode aligned with the two-stage reflection and transmission WDM filter corresponding to the three-wave multiplexing are also affected by the space for handling. It is difficult to dispose the drive circuit on the same substrate because distant disposition is required.

  In short, it is not easy to manufacture an optical transceiver module by applying a WDM filter for video signal separation corresponding to three-wave multiplexing based on the basic configuration of the optical transceiver module shown in FIG. Higher-performance optical transceiver modules used in metro systems are also required to be further reduced in price, but in reality, they are difficult to implement due to similar problems.

  On the other hand, in the case of the optical multiplexer / demultiplexer for wavelength multiplexing communication capable of bidirectional input / output shown in FIG. 23 and FIG. 24 described above, light of two different wavelengths λ1, λ2 is basically multiplexed or demultiplexed. In order to multiplex or demultiplex light of three or more different wavelengths, a fiber collimator that works as an optical element having an input / output port is required. It is necessary to prepare according to the number of wavelength multiplexing, but when constructing a function for multiplexing or demultiplexing light of many different wavelengths in this way, the number of parts increases due to the increase in the number of input / output ports. In addition to the high manufacturing cost, there is a problem that the arrangement of the input / output ports becomes complicated and the manufacturing becomes difficult, and there is a space for storing the extra length of the fiber for input / output. Need it There is a problem that it is difficult to make a module smaller by circumstances. Further, when a plurality of basic structures are connected in multiple stages, there is a problem that the insertion loss in each path becomes equal to the sum of the paths according to the number of stages, resulting in an insertion loss deviation.

  The present invention has been made to solve such problems, and one of the technical problems is that it can easily cope with more than three-wave multiplexing for realizing an inexpensive optical access network for subscribers. It is an object of the present invention to provide an inexpensive optical module that can be aligned with high accuracy. Another technical object of the present invention is to provide a high-performance and inexpensive optical transceiver module used in an optical communication network of a metro access system. Furthermore, another technical problem of the present invention is that even if a function for multiplexing or demultiplexing a plurality of light beams having different wavelengths can be constructed, the number of parts can be reduced, and the cost can be reduced. It is an object of the present invention to provide a high-performance optical multiplexer / demultiplexer in which the module can be reduced in size and the insertion loss deviation can be suppressed.

  According to the present invention, at least one laser diode, an optical lens, a wavelength filter, and a fiber collimator are provided in each case, and the optical light emitted from the laser diode in the case is provided. In the optical module having a function of coupling the light transmitted through the lens to the fiber collimator through the wavelength filter in free space, the optical lens is a condensing lens that condenses the light emitted from the laser diode; A collimator lens that collimates the light emitted from the laser diode, and a fiber that collects the light emitted from the laser diode by the condenser lens is built in between the condenser lens and the collimator lens. In addition, a capillary whose both end faces are polished is provided, and the collimator lens is a capillary face. (The first configuration) optical module for a parallel beam of light emitted from the bar is obtained.

  According to the invention, in the above optical module, the wavelength filter includes at least 2 so that the wavelength of the parallel light emitted from the collimator lens laser can be totally reflected and the light direction can be changed at least twice in the housing. As a result, an optical module (second configuration) in which the parallel light is incident at a predetermined incident angle can be obtained.

  Furthermore, according to the present invention, in any one of the above optical modules, an optical module (third configuration) can be obtained in which the wavelength filter is a dielectric multilayer film.

  In addition, according to the present invention, in any one of the optical modules described above, an optical module (fourth configuration) in which an optical isolator having a dedicated wavelength is added to the laser diode according to the transmission speed can be obtained. .

  According to the present invention, in any one of the above optical modules, between the wavelength filter and the fiber collimator, the light transmitted or totally reflected by the wavelength filter is directed only to the fiber collimator side, and the laser An optical module (the fifth configuration) is obtained in which isolators corresponding to the entire wavelength range of the diodes used are arranged.

  On the other hand, according to the present invention, at least one photodiode, an optical lens, a wavelength filter, and a fiber collimator are provided in the casing, and the parallel light incident from the fiber collimator in the casing is detected. In the optical module having a function of coupling the optical filter through the optical lens to the photodiode in free space, the wavelength filter totally reflects the wavelength of the parallel light incident from the fiber collimator. In order to change the direction of the light beam at least twice in the housing, at least two or more are arranged so that the parallel light can be incident at a predetermined incident angle. An optical module including a coupling lens that couples the total reflected parallel light to the photodiode (No. 1) The configuration) is obtained.

  Further, according to the present invention, in the above optical module, an optical module (seventh configuration) is obtained in which the wavelength filter is a dielectric multilayer film.

  On the other hand, according to the present invention, at least one laser diode, a photodiode, an optical lens, a wavelength filter, and a fiber collimator are provided in the casing, and light emitted from the laser diode in the casing. A function of allowing the optical lens transmitted through the optical lens to be coupled to the fiber collimator through the wavelength filter in free space, and the parallel light incident from the fiber collimator in the housing via the wavelength filter. An optical module having a function of coupling the photodiode to the photodiode in free space by transmitting the optical lens, and the optical lens includes a condensing lens that collects light emitted from the laser diode; A collimator lens that collimates the light emitted from the laser diode. Between the lens and the collimator lens, there is a built-in fiber that collects the light emitted from the laser diode by the condensing lens, and a capillary whose both end faces are polished. The wavelength filter is configured to convert at least one of the wavelength of the parallel light emitted from the collimator lens laser and the wavelength of the parallel light incident from the fiber collimator into the casing. In order to change the direction of the light at least twice, at least two or more are arranged so that the parallel light can be incident at a predetermined incident angle, and the optical lens is paralleled by a wavelength filter. An optical module (eighth configuration) is obtained that includes a coupling lens that couples the total reflected light to the photodiode. .

  Further, according to the present invention, in the above optical module, an optical module (with a ninth configuration) comprising a dielectric multilayer film as the wavelength filter can be obtained.

  Furthermore, according to the present invention, in any one of the above optical modules, an optical module (with a tenth configuration) in which an optical isolator having a dedicated wavelength is added to the laser diode in accordance with the transmission speed can be obtained.

  On the other hand, according to the present invention, the housing having the first side surface and the second side surface facing each other, the first input / output port disposed on the first side surface of the housing, and the second of the housing The second input / output port to the fifth input / output port arranged on the side surface of the optical signal, and the first input / output port has an optical signal having a wavelength group composed of the first to fourth wavelengths different from each other. The second incident / exit port through the fifth incident / exit port enter / exit optical signals having the first wavelength through the fourth wavelength, respectively. The housing transmits the optical signal having the first wavelength incident from the first incident / exit port toward the second incident / exit port and the incident from the second incident / exit port. First optical transmission means for transmitting an optical signal having a first wavelength toward the first input / output port; An optical signal having the second wavelength incident from the first input / output port is transmitted to the third input / output port, and an optical signal having the second wavelength incident from the third input / output port is transmitted to the third input / output port. A second light transmission means for transmitting toward the first input / output port, and an optical signal having a third wavelength incident from the first input / output port, toward the fourth input / output port; Third optical transmission means for transmitting an optical signal having the third wavelength incident from the fourth input / output port toward the first input / output port, and fourth input from the first input / output port And an optical signal having the fourth wavelength incident from the fifth input / output port toward the first input / output port. An optical multiplexer / demultiplexer having the fourth optical transmission means for transmitting is obtained.

  In this optical multiplexer / demultiplexer, the first light transmission means is disposed between the first side surface and the second side surface in the housing, and has the first wavelength and the second wavelength. A first wavelength filter that transmits an optical signal and reflects an optical signal having a third wavelength and a fourth wavelength; and a first wavelength filter and a second side surface in the vicinity of the second input / output port A second wavelength filter disposed between and transmitting an optical signal having the first wavelength and reflecting an optical signal having the second wavelength, and the second optical transmission means includes: A first wavelength filter, a second wavelength filter, a third wavelength filter which is disposed in the vicinity of the third input / output port and transmits only an optical signal having the second wavelength; and a second wavelength Reflecting the optical signal having the second wavelength reflected by the filter toward the third wavelength filter; And a first reflecting means for reflecting the optical signal having the second wavelength that has entered the housing from the three input / output ports and transmitted through the third wavelength filter toward the second wavelength filter. The third light transmission means is disposed in the vicinity of the first wavelength filter and the fourth input / output port, transmits an optical signal having the third wavelength, and has the fourth wavelength. A fourth wavelength filter that reflects the optical signal and an optical signal that is disposed on the first side surface side of the housing and that has the third wavelength and the fourth wavelength reflected by the first wavelength filter. An optical signal having the third wavelength that is reflected toward the fourth wavelength filter, is incident into the housing from the fourth input / output port, and passes through the fourth wavelength filter, and the fourth wavelength filter. The reflected optical signal having the fourth wavelength is directed to the first wavelength filter. And a fourth light transmitting means is disposed in the vicinity of the first wavelength filter, the fourth wavelength filter, and the fifth incident / exit port, and the fourth light transmitting means. A fifth wavelength filter that transmits only an optical signal having a wavelength of λ, and an optical signal having a fourth wavelength reflected by the fourth wavelength filter that is reflected toward the fifth wavelength filter; Comprising a third reflecting means for reflecting the optical signal having the fourth wavelength that has entered the housing from the input / output port and transmitted through the fifth wavelength filter toward the fourth wavelength filter; Each is preferred. Furthermore, in this optical multiplexer / demultiplexer, it is also preferable that each of the first to third reflecting means is constituted by a single mirror.

  According to the invention, in the optical multiplexer / demultiplexer, the first optical transmission means is disposed in the vicinity of the second input / output port and transmits only the optical signal having the first wavelength. An optical multiplexer / demultiplexer including a first wavelength filter that reflects an optical signal having the second to fourth wavelengths can be obtained.

  In this optical multiplexer / demultiplexer, the second optical transmission means is disposed in the vicinity of the first wavelength filter and the third input / output port, and transmits only the optical signal having the second wavelength, and A second wavelength filter that reflects an optical signal having a third wavelength and a fourth wavelength, and a second wavelength that is disposed on the first side surface side of the housing and reflected by the first wavelength filter The optical signal having the second wavelength is reflected from the optical signal having the fourth wavelength toward the second wavelength filter, and is incident on the third input / output port and passes through the second wavelength filter. The first reflecting means for reflecting toward the first wavelength filter, the third light transmitting means includes a first wavelength filter, a second wavelength filter, and a fourth input / output port. Is disposed in the vicinity, transmits only the optical signal having the third wavelength, and A third wavelength filter that reflects an optical signal having a length, and a light having a third wavelength and a fourth wavelength that are disposed on the first side surface in the housing and reflected by the second wavelength filter The optical signal of the third wavelength that reflects the signal toward the third wavelength filter and is incident from the fourth input / output port and passes through the third wavelength filter is directed toward the second wavelength filter. The second reflecting means for reflecting the light, and the fourth light transmitting means includes a first wavelength filter, a second wavelength filter, a third wavelength filter, and a vicinity of the fifth input / output port. And a fourth wavelength filter that transmits only an optical signal having the fourth wavelength, and a fourth wavelength filter that is disposed on the first side surface in the housing and reflected by the third wavelength filter. An optical signal having a wavelength of λ is reflected toward the fourth wavelength filter, and It comprised the transmitted optical signal of the wavelength of the fourth wavelength filter is incident fourth through entry and exit ports and a third reflecting means for reflecting the third wavelength filter, respectively preferable. Furthermore, in this optical multiplexer / demultiplexer, it is also preferable that the first reflecting means to the third reflecting means are constituted by a single mirror.

  In addition, according to the present invention, optical multiplexing / demultiplexing for multiplexing / demultiplexing an optical signal having a wavelength group composed of different wavelengths from the first wavelength to the Pth (P is an integer of 3 or more). A housing having a first side surface and a second side surface facing each other, a first input / output port disposed on the first side surface of the housing, and a second side surface of the housing The second input / output port to the (P + 1) th input / output port are arranged for inputting / exiting an optical signal having a wavelength group to / from the housing. The second input / output port through the (P + 1) th input / output port are for inputting and outputting optical signals having the first wavelength through the Pth wavelength, respectively. And p-th (p is a positive integer less than or equal to P) light-transmitting means. An optical signal having the p-th wavelength incident from the first port is transmitted to the (p + 1) -th input / output port, and an optical signal having the p-th wavelength incident from the (p + 1) -th input / output port is transmitted. An optical multiplexer / demultiplexer that transmits toward the first input / output port is obtained.

  According to the present invention, there is provided an optical multiplexer for multiplexing optical signals having a wavelength group consisting of wavelengths different from each other from a first wavelength to a Pth (P is an integer of 3 or more) A housing having a first side surface and a second side surface facing each other, an emission port disposed on the first side surface of the housing, and a first incident port through a second side surface of the housing A P-th incident port, and the emission port is for emitting an optical signal having a wavelength group from the housing, and the first to P-th incidence ports are the first wavelength to the first wavelength, respectively. This is for entering an optical signal having a P-th wavelength, and the casing includes first to P-th light transmission means, and the p-th (p is a positive integer equal to or less than P) ) Light transmission means directs an optical signal having the p-th wavelength incident from the p-th incident port toward the exit port. Optical multiplexer to obtain reached.

  Furthermore, according to the present invention, there is provided an optical demultiplexer for demultiplexing an optical signal having a wavelength group composed of a first wavelength to a Pth wavelength (P is an integer of 3 or more) different from each other. A housing having a first side surface and a second side surface facing each other, an incident port disposed on the first side surface of the housing, and a first emission port disposed on the second side surface of the housing To the Pth exit port, the entrance port is for entering an optical signal having a wavelength group into the casing, and the first exit port to the Pth exit port have the first wavelength, respectively. To emit an optical signal having the Pth wavelength, and the housing includes first to Pth optical transmission means, and the pth (p is a positive integer less than or equal to P) The optical transmission means transmits the optical signal having the p-th wavelength incident from the incident port toward the p-th emission port. That optical demultiplexer is obtained.

  On the other hand, according to the present invention, a housing having a first side surface and a second side surface facing each other, and a first input / output port and a second input / output port disposed on the first side surface of the housing, , And a third input / output port disposed on the second side surface of the housing, and the first input / output port is composed of different first to fourth wavelengths. An optical signal having a first wavelength group and an optical signal having a second wavelength group consisting of other wavelengths are input / exited to / from the housing. 2 for inputting / exiting optical signals of two wavelength groups to / from the housing, and the third input / output port through the sixth input / output port are light having the first wavelength through the fourth wavelength, respectively. This is for entering and exiting signals, and the housing is arranged in the vicinity of the first entrance and exit ports and the second entrance and exit ports In addition, the optical signal having the first wavelength group among the optical signals incident from the first input / output port is transmitted, and the optical signal having the second wavelength group is transmitted to the second input / output port. The optical signal having the second wavelength group reflected from the second input / output port, and reflecting the reflected optical signal having the second wavelength group to the second side surface. Transmitting / reflecting means for combining the optical signal having the first wavelength group incident from the side and emitting it to the first input / output port; and transmitting / reflecting means from the first input / output port An optical signal having a first wavelength incident thereon is transmitted toward a third input / output port, and an optical signal having the first wavelength incident from the third input / output port is transmitted / reflected. A first light transmitting means for transmitting the first input / output port through the means, and a first input / output port The optical signal having the second wavelength incident through the transmission / reflection means is transmitted toward the fourth input / output port, and the light having the second wavelength incident from the fourth input / output port is transmitted. A second light transmitting means for transmitting a signal toward the first input / output port via the transmission / reflection means, and a third wavelength incident from the first input / output port via the transmission / reflection means. Is transmitted toward the fifth input / output port, and the optical signal having the third wavelength incident from the fifth input / output port is transmitted through the transmission / reflection means to the first input / output port. Third optical transmission means for transmitting toward the input / output port, and an optical signal having the fourth wavelength incident from the first input / output port via the transmission / reflection means toward the sixth input / output port An optical signal having the fourth wavelength transmitted and incident from the sixth input / output port An optical multiplexer / demultiplexer having the fourth light transmitting means for transmitting the light to the first input / output port via the transmission / reflection means is obtained.

  In this optical multiplexer / demultiplexer, the first optical transmission means is disposed between the transmission / reflection means and the second side surface of the housing, and receives an optical signal having the first wavelength and the second wavelength. A first wavelength filter that transmits and reflects an optical signal having a third wavelength and a fourth wavelength; and between the first wavelength filter and the second side surface in the vicinity of the third input / output port. And a second wavelength filter configured to transmit an optical signal having the first wavelength and reflect an optical signal having the second wavelength, and the second optical transmission means includes: A wavelength filter and a second wavelength filter, a third wavelength filter disposed near the fourth input / output port and transmitting only an optical signal having the second wavelength, and reflected by the second wavelength filter Reflecting the reflected optical signal having the second wavelength toward the third wavelength filter; And a first reflecting means for reflecting the optical signal having the second wavelength, which has entered the housing from the four input / output ports and transmitted through the third wavelength filter, toward the second wavelength filter. The third light transmitting means is disposed in the vicinity of the first wavelength filter and the fifth input / output port, transmits an optical signal having the third wavelength, and has the fourth wavelength. A fourth wavelength filter that reflects the optical signal and an optical signal that is disposed on the first side surface side of the housing and that has the third wavelength and the fourth wavelength reflected by the first wavelength filter. An optical signal having the third wavelength that is reflected toward the fourth wavelength filter, is incident on the housing from the fifth input / output port, and is transmitted through the fourth wavelength filter; and a fourth wavelength filter. The reflected optical signal having the fourth wavelength is directed to the first wavelength filter. And the fourth light transmitting means are disposed in the vicinity of the first wavelength filter, the fourth wavelength filter, and the sixth input / output port, and the fourth light transmitting means. A fifth wavelength filter that transmits only an optical signal having a wavelength and an optical signal having a fourth wavelength reflected by the fourth wavelength filter toward the fifth wavelength filter; Comprising a third reflecting means for reflecting the optical signal having the fourth wavelength which has entered the housing from the emission port and transmitted through the fifth wavelength filter toward the fourth wavelength filter; Each is preferred. Furthermore, in this optical multiplexer / demultiplexer, it is also preferable that the first reflecting means to the third reflecting means are constituted by a single mirror.

  On the other hand, according to the present invention, in the optical multiplexer / demultiplexer, the first optical transmission means is disposed in the vicinity of the third input / output port and transmits only the optical signal having the first wavelength, An optical multiplexer / demultiplexer including a first wavelength filter that reflects an optical signal having the second to fourth wavelengths is obtained.

  In this optical multiplexer / demultiplexer, the second optical transmission means is disposed in the vicinity of the first wavelength filter and the fourth input / output port, transmits only the optical signal having the second wavelength, and A second wavelength filter that reflects an optical signal having a third wavelength and a fourth wavelength, and a second wavelength that is disposed on the first side surface side of the housing and reflected by the first wavelength filter The optical signal having the second wavelength is reflected from the optical signal having the fourth wavelength toward the second wavelength filter, and is incident on the fourth input / output port and passes through the second wavelength filter. The first reflecting means for reflecting toward the first wavelength filter, and the third light transmitting means includes the first wavelength filter and the second wavelength filter, and the vicinity of the fifth input / output port. And transmitting only the optical signal having the third wavelength, and the fourth wavelength A third wavelength filter that reflects an optical signal having a length, and a light having a third wavelength and a fourth wavelength that are disposed on the first side surface in the housing and reflected by the second wavelength filter The optical signal of the third wavelength reflected from the signal toward the third wavelength filter and then incident from the fifth input / output port and transmitted through the third wavelength filter is directed to the second wavelength filter. And the fourth light transmitting means are arranged in the vicinity of the first wavelength filter, the second wavelength filter, the third wavelength filter, and the sixth input / output port. And a fourth wavelength filter that transmits only an optical signal having a fourth wavelength, and a fourth wavelength filter that is disposed on the first side surface in the housing and is reflected by the third wavelength filter. The optical signal having the wavelength is reflected toward the fourth wavelength filter, and further And third reflecting means for reflecting the optical signal of the fourth wavelength that has entered from the input / output port of the first light and transmitted through the fourth wavelength filter toward the third wavelength filter. . Furthermore, in this optical multiplexer / demultiplexer, it is also preferable that the first reflecting means to the third reflecting means are constituted by a single mirror.

  Further, according to the present invention, an optical signal having a first wavelength group composed of wavelengths different from each other from a first wavelength to a Pth (where P is an integer of 3 or more) is multiplexed with another optical signal. An optical multiplexer / demultiplexer for multiplexing / demultiplexing an optical signal having the first wavelength group from the other optical signal, the first side surface and the second side facing each other A housing having a plurality of side surfaces, a first input / output port and a second input / output port disposed on the first side surface of the housing, and a third input / output port disposed on the second side surface of the housing. Port to (P + 2) input / output port, and the first input / output port includes an optical signal having a first wavelength group and an optical signal having a second wavelength group composed of other wavelengths. The second input / output port is used to input / output an optical signal of the second wavelength group to / from the housing. The third input / output ports through (P + 2) input / output ports are for inputting and outputting optical signals having the first wavelength through the Pth wavelength, respectively. A transmission / reflection unit disposed in the vicinity of the exit port and the second entrance / exit port; and a first light transmission unit to a P-th transmission unit, wherein the transmission / reflection unit is connected to the first entrance / exit port. Of the incident optical signal, the optical signal having the first wavelength group is transmitted, the optical signal having the second wavelength group is reflected toward the second incident / exit port, and the second incident / exit is further reflected. The optical signal having the second wavelength group incident from the port is reflected, and the reflected optical signal having the second wavelength group is incident from the second side surface side. It is combined with the optical signal and output toward the first input / output port, and the pth (p is a positive integer less than or equal to P) optical transmission. The means transmits the optical signal having the pth wavelength incident from the first input / output port through the transmission / reflection means to the (p + 2) th input / output port, and further, the (p + 2) th input / output port. An optical multiplexer / demultiplexer which transmits an optical signal having the p-th wavelength incident from an output port toward the first input / output port via the transmission / reflection means.

  By the way, according to the present invention, an optical multiplexing / demultiplexing unit comprising a plurality of optical multiplexing / demultiplexing devices connected in series / parallel can be obtained.

  Furthermore, according to the present invention, the first optical multiplexer / demultiplexer to the Nth optical multiplexer are adapted so as to correspond to a P × N (where P is an integer of 3 or more) wavelength with respect to a natural number N of 2 or more. An optical multiplexing / demultiplexing unit configured by cascading demultiplexers, wherein the nth (where N and n are integers satisfying the relation 1 ≦ n ≦ N), Optical signals having an nth wavelength group consisting of P (n−1) +1} to Pn wavelengths are demultiplexed / multiplexed with other optical signals, or light having the nth wavelength group The first optical multiplexer / demultiplexer through the Nth optical multiplexer / demultiplexer are respectively provided with the first casing through the Nth casing. Each of the first to Nth casings has a first side surface and a second side surface facing each other, and the nth optical multiplexer / demultiplexer has a Qth equal to P + 2 {Q (n-1) +1} input / output ports and {Q (n-1) +2} input / output ports arranged on the first side surface of the housing, and the nth housing {Q (n-1) +3} th input / output port to Qnth input / output port arranged on the second side surface, and the {Q (n-1) +1} th input / output port is nth And (n + 1) th wavelength group to optical signal having Nth wavelength group are input to and output from the nth housing, and {Q (n− 1) The +2} input / output port is for inputting / outputting optical signals of the (n + 1) th wavelength group to the Nth wavelength group to / from the nth housing (where n is N) If equal, this indicates that there is no optical signal input / output), the {Q (n-1) +3} th input / output port through the Qnth input / output port are {P (n-1) +1} respectively. For the input and output of an optical signal having a wavelength of Pn to a wavelength of Pn, and the {Q (n-1) +2} input / output port of the nth casing is the (n + 1) th casing Thus, an optical multiplexing / demultiplexing unit optically coupled to the (Qn + 1) th input / output port (where n is equal to N indicates that there is no connection destination) is obtained.

  In this optical multiplexing / demultiplexing unit, the nth casing is arranged in the vicinity of the {Q (n−1) +1} th input / output port and the {Q (n−1) +2} th input / output port. n transmission / reflection means and {P (n-1) +1} th light transmission means to Pnth light transmission means, wherein the n transmission / reflection means has {Q (n-1) + 1th }, The optical signal having the nth wavelength group among the optical signals incident from the input / output ports is transmitted, and the optical signal having the (n + 1) th wavelength group to the Nth wavelength group is transmitted as {Q (n −1) +2} reflected from the input / output port and the (n + 1) th wavelength group to the Nth wavelength group incident from the {Q (n−1) +2} input / output port. And the reflected optical signal having the (n + 1) th wavelength group to the Nth wavelength group is incident from the second side surface side. Are combined with the optical signal having the wavelength group and output toward the {Q (n−1) +1} input / output port, and the {P (n−1) +1} th optical transmission means to Pn The optical transmission means of the (Q (n−1) +1) th input / output port through the nth transmission / reflection means enter the {(P (n−1) +1) th wavelength to Pn. An optical signal having a wavelength is transmitted to the {Q (n−1) +3} to Qn input / output ports, and further from the {Q (n−1) +3} to Qn input / output ports. The incident optical signals having the wavelengths {P (n-1) +1} to Pn are input to the {Q (n-1) +1} input / output ports via the nth transmission / reflection means. It is preferable to transmit toward.

  On the other hand, according to the present invention, one input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to transmit three light beams, and the outer side on the other side. Two input / output ports are provided in the vicinity, and light of two different wavelengths are separately incident from the two input / output ports and multiplexed to the one input / output port, or from the one input / output port An optical multiplexer / demultiplexer that can enter and exit in both directions by entering and splitting into the two input / output ports, and transmits light of one wavelength at two different wavelengths, and A wavelength filter that reflects the light of the other wavelength and a total reflection mirror that totally reflects the light of the other wavelength are provided in the casing, and further one of the one input / output port and the two input / output ports. The input and output ports of each light beam have approximately the same optical axis. So that the wavelength filter is arranged at a predetermined angle on the optical axis, and the total reflection mirror is used to transmit and receive the light rays entering and exiting at the other entrance and exit ports of the two entrance and exit ports. The two input / output ports are arranged so that the optical axis is substantially parallel to the optical axis of the light beam coupled to one of the two input / output ports. Are disposed at a predetermined position at a predetermined angle with respect to the optical axis of the light beam entering and exiting the other light incident / exit port. Are coupled optically through a wavelength filter, and light of the other wavelength is transmitted between one input / output port and the other input / output port in the two input / output ports. Optically connected via a wavelength filter and total reflection mirror. Demultiplexer to be obtained.

  Further, according to the present invention, one input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to be able to transmit five light beams, and the outer side on the other side. There are four input / output ports in the vicinity, and light of four different wavelengths is separately incident from the four input / output ports and multiplexed to the one input / output port, or from the one input / output port An optical multiplexer / demultiplexer capable of bi-directional input / output by entering and demultiplexing into the four input / output ports, wherein the first wavelength and the second wavelength are at four different wavelengths. A first wavelength filter that transmits light and reflects light of the third wavelength and the fourth wavelength; and a second wavelength that transmits light of the first wavelength and reflects light of the second wavelength A wavelength filter, a third wavelength filter that transmits only light of the second wavelength, and light of the third wavelength. And a fourth wavelength filter that reflects light of the fourth wavelength, a fifth wavelength filter that transmits only light of the fourth wavelength, and a first that totally reflects light of the second wavelength. A total reflection mirror, a second total reflection mirror that totally reflects light of the third wavelength and the fourth wavelength, and a third total reflection mirror that totally reflects light of the fourth wavelength are provided in the housing. In addition, the first input / output port of the one input / output port and the four input / output ports are arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams substantially coincide with each other. Each of the first wavelength filter and the second wavelength filter is disposed at a predetermined angle on the optical axis, and the first total reflection mirror, the second total reflection mirror, and the third total reflection mirror have four input channels. Second input / output port, third input / output port, and fourth input / output port in the output port The second input / output port and the third input / output port so that the optical axis of the light beam entering / exiting the light beam is substantially parallel to the optical axis of the light beam coupled from one input / output port to the first input / output port. And a third wavelength filter, a fourth wavelength filter, a first wavelength filter, a fourth wavelength filter, a fourth wavelength filter, a fourth wavelength filter, and a fourth wavelength filter. 5 wavelength filters are arranged at predetermined angles with respect to the respective optical axes, and the first wavelength light is transmitted between one input / output port and the first input / output port. And a second wavelength filter, and the second wavelength light is transmitted between one input / output port and the second input / output port between the first wavelength filter and the second wavelength filter. , And optical via a third wavelength filter and a first total reflection mirror And the light of the third wavelength passes between the first input / output port and the third input / output port via the first wavelength filter, the fourth wavelength filter, and the second total reflection mirror. The fourth wavelength light is optically coupled between the first input / output port and the fourth input / output port, and the fifth wavelength filter and the fifth wavelength filter. An optical multiplexer / demultiplexer optically coupled through the second total reflection mirror and the third total reflection mirror is obtained.

  In addition, according to the present invention, three input / output ports are provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to be able to transmit seven light beams, and the outer side of the other side is provided. 4 input / output ports in the vicinity, and light of six different wavelengths in the three input / output ports, the second input / output port in the four input / output ports, the third input / output port, And the fourth input / output port separately to be combined with the first input / output port in the four input / output ports, or the first input / output port to enter the 3 Bi-directional input / output can be performed by demultiplexing into one input / output port and the second input / output port, the third input / output port, and the fourth input / output port in the four input / output ports. Possible optical multiplexer / demultiplexer, first wavelength, second wave at 6 different wavelengths , And a first wavelength filter that transmits light of the third wavelength and reflects light of the fourth wavelength, fifth wavelength, and sixth wavelength, and transmits light of the first wavelength, And a second wavelength filter that reflects light of the second wavelength and the third wavelength, a third wavelength filter that transmits light of the second wavelength and reflects light of the third wavelength, and A fourth wavelength filter that transmits only light of the third wavelength, a fifth wavelength filter that transmits light of the fourth wavelength and reflects light of the fifth wavelength and the sixth wavelength, A sixth wavelength filter that transmits light of the sixth wavelength and reflects light of the sixth wavelength, a seventh wavelength filter that transmits only the light of the sixth wavelength, the second wavelength and the third wavelength A first mirror surface that reflects light of a wavelength and a second mirror surface that reflects light of a fifth wavelength and a sixth wavelength are each provided on one side. And the first input / output port and the first input / output port of the three input / output ports substantially coincide with each other in the optical axis of the incident / exit light beam. The first wavelength filter and the second wavelength filter are respectively arranged at predetermined angles on the optical axis, and the third wavelength filter, the fourth wavelength filter, and the total reflection mirror are The optical axes of the light beams entering / exiting the second input / output port and the third input / output port in the three input / output ports are 3 from the first input / output port in the four input / output ports. The second input / output ports of the three input / output ports and the second input / output ports of the three input / output ports so as to be substantially parallel to the optical axis of the light beam coupled to the first input / output port of the three input / output ports; With respect to the optical axis of the light beam entering and exiting the third entrance / exit port. The second input / output port and the fifth wavelength filter in the four input / output ports arranged at a predetermined angle at a predetermined angle have an optical axis in the direction of the light reflected by the first wavelength filter. The third input / output port, the fourth input / output port, the sixth wavelength filter, and the seventh wavelength filter in the four input / output ports, which are arranged to coincide with each other, are the four input / output ports. The optical axes of the light beams entering and exiting the third entrance and exit ports are substantially parallel to the optical axes of the second entrance and exit ports in the four entrance and exit ports. The light having the first wavelength is arranged at a predetermined position at a predetermined angle so that the first input / output port in the four input / output ports and the first input / output port in the three input / output ports. Through the first wavelength filter and the second wavelength filter. The second wavelength light is optically coupled between the first input / output port in the four input / output ports and the second input / output port in the three input / output ports. The first wavelength filter, the second wavelength filter, and the third wavelength filter and the total reflection mirror are optically coupled, and the light of the third wavelength is the first at the four input / output ports. The first wavelength filter, the second wavelength filter, the third wavelength filter, and the fourth wavelength filter between the input / output port of the first and third input / output ports of the three input / output ports The fourth wavelength light is optically coupled through the reflection mirror, and the fourth wavelength light is transmitted between the first input / output port and the second input / output port in the four input / output ports. And a fifth wavelength filter and a total reflection mirror to be optically coupled, The first wavelength filter, the fifth wavelength filter, and the sixth wavelength filter are arranged between the first input / output port and the third input / output port in the four input / output ports. The sixth wavelength light is optically coupled through the total reflection mirror, and the sixth wavelength light is transmitted between the first input / output port and the fourth input / output port in the four input / output ports. An optical multiplexer / demultiplexer optically coupled through the filter, the fifth wavelength filter, the sixth wavelength filter, and the seventh wavelength filter and the total reflection mirror is obtained.

  In addition, according to the present invention, one input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to transmit five light beams, and the outer side on the other side. There are four input / output ports in the vicinity, and light of four different wavelengths is separately incident from the four input / output ports and multiplexed to the one input / output port, or from the one input / output port An optical multiplexer / demultiplexer that can enter and exit in both directions by entering and demultiplexing into the four input / output ports, and transmits light of the first wavelength at four different wavelengths, And a first wavelength filter that reflects the light of the other second wavelength, the third wavelength, and the fourth wavelength, the light of the second wavelength, and the third wavelength and the fourth wavelength. The second wavelength filter that reflects the light of the third wavelength, the light of the third wavelength that transmits the light, and the light of the fourth wavelength A third wavelength filter that transmits, a fourth wavelength filter that transmits only light of the fourth wavelength, a total reflection mirror that totally reflects light of the second wavelength, the third wavelength, and the fourth wavelength; A translucent substrate in which the first to fourth wavelength filters and the total reflection mirror are fixed is provided in the housing, and the first and fourth input / output ports and the first and fourth input / output ports The first wavelength filter, which is arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams substantially coincide with each other, is fixed at a predetermined angle on the optical axis. The total reflection mirrors arranged at and fixed to the light-transmitting substrate are incident / exited into the second input / output port, the third input / output port, and the fourth input / output port in the four input / output ports. The optical axis of the light beam is coupled from one input / output port to the first input / output port Predetermined with respect to the optical axes of the light beams entering and exiting the second input / output port, the third input / output port, and the fourth input / output port so as to be substantially parallel to the optical axis of the light beam The second wavelength filter, the third wavelength filter, and the fourth wavelength filter that are arranged at predetermined positions and fixed to the translucent substrate are respectively at predetermined angles with respect to the respective optical axes. The light having the first wavelength is optically coupled between the one input / output port and the first input / output port through a first wavelength filter fixed to the light-transmitting substrate, The light having the second wavelength passes through the second wavelength filter, the third wavelength filter, and the total reflection mirror that are respectively fixed to the translucent substrate between the one input / output port and the second input / output port. The third wavelength light is coupled to one input / output port and a third input / output port. A first wavelength filter, a second wavelength filter, and a third wavelength filter and a total reflection mirror, which are respectively fixed to the light-transmitting substrate between the first and second reflection ports. The light of the wavelength includes a first wavelength filter, a second wavelength filter, a third wavelength filter, and a first wavelength filter fixed to the light-transmitting substrate between one input / output port and a fourth input / output port, respectively. Thus, an optical multiplexer / demultiplexer optically coupled through the four wavelength filters and the total reflection mirror is obtained.

  Further, according to the present invention, one input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed so as to be able to transmit five light beams, and the outer side on the other side. There are four input / output ports in the vicinity, and light of four different wavelengths is separately incident from the four input / output ports and multiplexed to the one input / output port, or from the one input / output port An optical multiplexer / demultiplexer capable of bi-directional input / output by entering and demultiplexing into the four input / output ports, wherein the first wavelength and the second wavelength are at four different wavelengths. A first wavelength filter that transmits light and reflects light of the third wavelength and the fourth wavelength; and a second wavelength that transmits light of the first wavelength and reflects light of the second wavelength A wavelength filter, a third wavelength filter that transmits only light of the second wavelength, and a light of third wavelength. And a fourth wavelength filter that reflects light of the fourth wavelength, a fifth wavelength filter that transmits only light of the fourth wavelength, and a first total filter that totally reflects light of the second wavelength. A reflection mirror; a second total reflection mirror that totally reflects light of the third wavelength and the fourth wavelength; a third total reflection mirror that totally reflects light of the fourth wavelength; and a first wavelength filter. To a fifth wavelength filter, and a translucent substrate to which the first total reflection mirror and the third total reflection mirror are fixed, are provided in the casing, and further, one input / output port and four input / output ports are provided. The first input and output ports are arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams substantially coincide with each other, and the first wavelength filter and the second wavelength filter fixed to the translucent substrate. Each of the wavelength filters is arranged on the optical axis at a predetermined angle, and is fixed to the translucent substrate. The total reflection mirror, the third total reflection mirror, and the second total reflection mirror are the second input / output port, the third input / output port, and the fourth input / output port in the four input / output ports. The second input / output port and the third input / output port so that the optical axis of the light beam entering / exiting is substantially parallel to the optical axis of the light beam coupled from one input / output port to the first input / output port. A third wavelength filter which is disposed at a predetermined position at a predetermined angle with respect to the optical axis of the light entering / exiting the fourth input / output port, and is fixed to the translucent substrate, The fourth wavelength filter and the fifth wavelength filter are arranged at predetermined angles with respect to the respective optical axes, and the light of the first wavelength is transmitted to one input / output port and the first input / output port. Between the first wavelength filter and the second wavelength filter fixed to the translucent substrate. A first wavelength filter optically coupled through a filter, and having a second wavelength fixed to the translucent substrate between one input / output port and the second input / output port; The second wavelength filter, and the third wavelength filter and the first total reflection mirror are optically coupled to each other, and the third wavelength light is transmitted between one input / output port and the third input / output port. The first wavelength filter, the fourth wavelength filter, and the second total reflection mirror that are fixed to the translucent substrate between them are optically coupled, and the light of the fourth wavelength is one input / output The first wavelength filter, the fourth wavelength filter, the fifth wavelength filter, the second total reflection mirror, and the translucency fixed to the translucent substrate between the port and the fourth input / output port Optical multiplexer / demultiplexer optically coupled via a third total reflection mirror fixed to the substrate Obtained.

  Further, according to the present invention, one input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to be able to transmit five light beams, and the outer side on the other side. There are four input / output ports in the vicinity, and light of four different wavelengths is separately incident from the four input / output ports and multiplexed to the one input / output port, or from the one input / output port An optical multiplexer / demultiplexer capable of bi-directional input / output by entering and demultiplexing into the four input / output ports, wherein the first wavelength and the second wavelength are at four different wavelengths. A first wavelength filter that transmits light and reflects light of the third wavelength and the fourth wavelength; and a second wavelength that transmits light of the first wavelength and reflects light of the second wavelength A wavelength filter, a third wavelength filter that transmits only light of the second wavelength, and light of the third wavelength. And a fourth wavelength filter that reflects light of the fourth wavelength, a fifth wavelength filter that transmits only light of the fourth wavelength, and a first that totally reflects light of the second wavelength. A total reflection mirror, a second total reflection mirror that totally reflects light of the third wavelength and the fourth wavelength, a third total reflection mirror that totally reflects light of the fourth wavelength, and three total reflections A first translucent substrate to which a mirror and a first wavelength filter are fixed, a first wavelength filter to a fifth wavelength filter, a first total reflection mirror, and a third total reflection mirror to be fixed. 2 translucent substrates are disposed in the housing, and the first input / output port in the one input / output port and the four input / output ports substantially each has an optical axis of the incident / exit light beam. 1st which is arrange | positioned on a substantially straight line so that it may correspond, and was fixed to the 1st translucent board | substrate and the 2nd translucent board | substrate. The wavelength filter and the second wavelength filter fixed to the second translucent substrate are arranged at predetermined angles on the optical axis, respectively, and the first translucent substrate and the second translucent substrate The first total reflection mirror fixed to the first light transmission substrate, the second total reflection mirror fixed to the first light transmission substrate, and the first light transmission substrate and the second light transmission substrate. The third total reflection mirror thus formed has an optical axis of 1 for light beams incident on and output from the second input / output port, the third input / output port, and the fourth input / output port in the four input / output ports. The second input / output port, the third input / output port, and the fourth input port so as to be substantially parallel to the optical axis of the light beam coupled from the one input / output port to the first input / output port. A second translucent substrate disposed at a predetermined position at a predetermined angle with respect to the optical axis of the light beam entering / exiting the input / output port; The third wavelength filter, the fourth wavelength filter, and the fifth wavelength filter fixed respectively to the optical axes are arranged at predetermined angles with respect to the respective optical axes, and the light of the first wavelength is one A first wavelength filter fixed to the first light-transmitting substrate and the second light-transmitting substrate between the input / output port and the first light-emitting port and the second light-transmitting substrate are fixed. The second wavelength filter is optically coupled through the second wavelength filter, and the light having the second wavelength is transmitted between the first input / output port and the second input / output port. A first wavelength filter fixed to the transparent substrate, a second wavelength filter fixed to the second transparent substrate, and a third wavelength fixed to the second transparent substrate. Light is transmitted through the filter, the first translucent substrate, and the first total reflection mirror fixed to the second translucent substrate. And the light of the third wavelength is fixed to the first light-transmitting substrate and the second light-transmitting substrate between one input / output port and the third input / output port. Are optically coupled via a wavelength filter of, a fourth wavelength filter fixed to the second light transmissive substrate, and a second total reflection mirror fixed to the first light transmissive substrate, A first wavelength filter fixed to the first light-transmitting substrate and the second light-transmitting substrate between one input / output port and the fourth input / output port; A fourth wavelength filter fixed to the second light transmitting substrate, a fifth wavelength filter fixed to the second light transmitting substrate, and a second wavelength filter fixed to the first light transmitting substrate. Optically coupled via the total reflection mirror of the first optically coupled mirror and the third total reflection mirror fixed to the first and second translucent substrates. Vessel can be obtained.

  In addition, according to the present invention, one input / output port is provided in the vicinity of the outer side on one side of the opposite wall surface in the casing formed so as to be able to transmit five light beams, and the outer side on the other side. 4 input / output ports in the vicinity, and light of four different wavelengths are separately incident from the four input / output ports and multiplexed to the one input / output port, or the one input / output port Is an optical multiplexer / demultiplexer capable of bi-directional input / output by demultiplexing into the four input / output ports by entering from the first and second wavelengths, and the first wavelength and the second wavelength at four different wavelengths A first wavelength filter that transmits light of the third wavelength and reflects light of the third wavelength and the fourth wavelength, and a second wavelength that transmits light of the first wavelength and reflects light of the second wavelength Wavelength filter, a third wavelength filter that transmits only light of the second wavelength, and light of the third wavelength A fourth wavelength filter that transmits and reflects light of the fourth wavelength; a fifth wavelength filter that transmits only light of the fourth wavelength; and light of the third wavelength and light of the fourth wavelength A first total reflection mirror that totally reflects light, a second total reflection mirror that totally reflects light of a second wavelength, a third total reflection mirror that totally reflects light of a fourth wavelength, First translucent substrate to which total reflection mirror to third total reflection mirror and first wavelength filter are fixed, and second translucent substrate to which first wavelength filter to fifth wavelength filter are fixed And a third light-transmitting substrate to which the first light-transmitting substrate and the second light-transmitting substrate are fixed are provided in the housing, and further, there is one input / output port and four input / output ports. The first incident / exit ports are arranged on a substantially straight line so that the optical axes of the incident / exiting light beams substantially coincide with each other. The first wavelength filter fixed to the translucent substrate and the second translucent substrate and the second wavelength filter fixed to the second translucent substrate each have a predetermined angle on the optical axis. The first total reflection mirror, the second total reflection mirror, and the third total reflection mirror that are arranged in the first and second transparent substrates are respectively fixed to the first light transmitting substrate. The optical axes of the light beams entering and exiting the first input / output port, the third input / output port, and the fourth input / output port are relative to the optical axis of the light beam coupled from one input / output port to the first input / output port. So as to be substantially parallel to each other at a predetermined angle with respect to the optical axes of the light beams entering and exiting the second entrance / exit port, the third entrance / exit port, and the fourth entrance / exit port. The third wavelength filter and the fourth wave, which are arranged at positions and fixed to the second light-transmitting substrate, respectively. The long filter, the fifth wavelength filter, and the third light-transmitting substrate are arranged at predetermined angles with respect to the respective optical axes. A first wavelength filter fixed to the first light-transmitting substrate and the second light-transmitting substrate, and a second wavelength fixed to the second light-transmitting substrate. The light having the second wavelength is optically coupled through the filter, and the first light-transmitting substrate and the second light-transmitting substrate are provided between the one input / output port and the second input / output port. A first wavelength filter fixed to the second light transmitting substrate, a second wavelength filter fixed to the second light transmitting substrate, a third wavelength filter fixed to the second light transmitting substrate, and the first wavelength filter. Optically coupled through a second total reflection mirror fixed to the translucent substrate, and the third wavelength light is transmitted through one input / output port. The first wavelength filter fixed to the first light-transmitting substrate and the second light-transmitting substrate between the first and third input / output ports and the fourth wavelength fixed to the second light-transmitting substrate Are coupled optically via a first total reflection mirror fixed to the first light-transmitting substrate, and light having a fourth wavelength is transmitted through one input / output port and a fourth input / output port. A first wavelength filter fixed to the first light-transmitting substrate and the second light-transmitting substrate between the output port, a fourth wavelength filter fixed to the second light-transmitting substrate, and Optically via a fifth wavelength filter fixed to the second translucent substrate, a first total reflection mirror and a third total reflection mirror fixed to the first translucent substrate. An optical multiplexer / demultiplexer to be coupled is obtained.

  According to the first configuration of the optical module of the present invention, the coupling efficiency between the laser diode and the fiber collimator can be easily increased, and the light emitted from the laser diode can be efficiently and shortened. Since the optical fiber module can be coupled to a fiber collimator located sufficiently away in time, an optical module can be configured at low cost. According to the second configuration, in the optical module having a plurality of laser diodes, the laser diodes can be arranged at arbitrary positions with respect to the housing, and the arrangement of each laser diode and the electric / electronic circuit for driving can be arranged. Since the arrangement becomes easy, the degree of freedom in design increases. According to the third configuration, wavelength selectivity is improved in addition to the effects of the first configuration and the second configuration. According to the 4th structure, the construction | assembly of the optical module according to the required transmission rate is attained. According to the fifth configuration, since the optical isolator disposed between the wavelength filter and the fiber collimator corresponds to the entire wavelength range of the laser diode to be used, even when a plurality of laser diodes are provided, The wavelength of the oscillation light from the laser diode can be stabilized and guided to the fiber collimator effectively, and an optical module corresponding to the required transmission speed can be constructed without adopting the fourth configuration. Is possible. According to the sixth configuration, in the optical module having a plurality of photodiodes, the photodiodes can be arranged at arbitrary positions with respect to the casing, and the arrangement of each photodiode and the driving electric / electronic circuit Is easy to arrange. According to the seventh configuration, wavelength selectivity is improved in addition to the effects of the sixth configuration. According to the eighth configuration, the effects of the first configuration, the second configuration, and the sixth configuration described above are combined. According to the ninth configuration, wavelength selectivity is improved in addition to the effect of the eighth configuration. According to the tenth configuration, it is possible to construct an optical module according to the required transmission rate in addition to the effects of the eighth configuration and the ninth configuration. Furthermore, the optical module of the present invention can be obtained by simply increasing the number of wavelength filters or combining two or four-wave multiplexing optical modules, for example, eight or more waves such as eight-wave multiplexing or sixteen-wave multiplexing. It can be applied to a transmission module, an optical reception module, or an optical transmission / reception module, and also for an optical module for high-density wavelength division multiplexing (DWDM) with a very narrow wavelength interval, a dielectric multilayer film together with a laser diode and a photodiode. It can be applied by appropriately combining the wavelength filters according to the above.

  In the case of the optical multiplexer / demultiplexer according to the present invention, in one embodiment, the first input / output port is disposed on the first side surface of the casing, and the second input / output port is provided on the second side surface of the casing. A fifth input / output port is disposed, and a structure in which the first light transmission means to the fourth light transmission means are provided in the housing and the optical signals are spatially coupled is employed, so that a fiber is provided in the housing. Because there is no need to provide a space to store the extra length, the number of fiber collimators as input and output ports can be reduced, so the number of parts can be reduced and the parts can be downsized, and the insertion loss deviation is suppressed. become able to. Furthermore, in the case of the optical multiplexer / demultiplexer of another form, the first input / output port and the second input / output port are arranged on the first side surface of the housing, and the third input / output port is arranged on the second side surface of the housing. A port to sixth input / output ports are arranged, and a structure that includes transmission / reflection means and first light transmission means to fourth light transmission means in the casing to spatially couple optical signals is adopted. As a result, the number of fiber collimators can be reduced, and there is no need to provide a space for storing the extra fiber length in the housing. This reduces the number of parts, reduces the size of the parts, and suppresses the insertion loss deviation. It becomes possible to construct an optical multiplexing / demultiplexing unit having a multi-stage configuration.

  Further, in the case of the optical multiplexer / demultiplexer according to the present invention, the wavelength multiplexing number required for the outer side of one side and the other side of the opposing wall surface outside the housing formed to transmit a predetermined number of light beams is adjusted. In addition, an input / output port (a fiber collimator having the same) is provided, and a wavelength filter and a total reflection mirror are appropriately combined in the housing to combine light in a spatial manner, and light of different wavelengths is combined or Since the function of demultiplexing is built, the number of input / output ports (fiber collimators with it) can be reduced, so the number of parts can be reduced and the cost can be reduced, and the extra fiber length is stored in the housing. This makes it possible to reduce the size of the components without having to provide a space for the transmission, and as a result, the arrangement of the input / output ports can be simplified according to the required number of wavelength multiplexing, thereby reducing the size of the module. High-performance products that may be so is obtained. In particular, in the case of the optical multiplexer / demultiplexer of the present invention, a preferable end face of the casing is formed by using a dielectric multilayer film for the wavelength filter and the total reflection mirror disposed in the casing, and effectively totally reflecting a specific wavelength. Since an input / output port (a fiber collimator having the same) can be disposed in the optical multiplexer / demultiplexer, the optical multiplexer / demultiplexer can be easily configured as a high-performance device at a low cost after being downsized.

  The best mode of the optical module of the present invention is based on the first configuration described above, and the second configuration is adopted on this. Alternatively, the sixth configuration or the eighth configuration is adopted.

  Any material that can be used as a case such as a metal such as stainless steel, hastelloy, or kovar, or glass, plastic, ceramics, or the like can be applied to the casing used in each of these configurations. Examples of laser diodes include Fabry-Perot lasers and distributed feedback lasers (DFB lasers), and surface-emitting laser diodes can also be used. In either case, they can be enclosed in a package such as a can, mini-dill, or butterfly. It is desirable to use it as a stopped structure.

  Examples of collimator lenses and condenser lenses include aspherical lenses, spherical lenses, rod lenses, and diffractive lenses. In the case of a rod lens, a GRIN (Graded Index) lens, a D lens obtained by processing a spherical lens into a rod shape, and the like can be exemplified in addition to those obtained by processing the end surface into a C lens.

  It is desirable to use a wavelength filter having a configuration in which a dielectric multilayer film is formed on an optical glass substrate. In the optical glass substrate here, as the substrate glass, various optical glasses can be used in addition to quartz glass and Pyrex (registered trademark) glass, and as the substrate, in addition to normal optical glass, polymers such as polyimide are used. A substrate may be used, and when used as a total reflection mirror, there is no problem even if a metal, an absorptive glass, a crystal substrate, or the like is used.

  The fiber collimator includes a pigtail fiber, an aspheric lens, a spherical lens, a rod lens, a diffractive lens, etc., in which the fiber is inserted and fixed in a glass, zirconia, or plastic or metal capillary and the end face is polished at a predetermined angle and accuracy. Can be exemplified.

  As the capillary containing the fiber, any material can be used as long as various fibers can be fixed and the fiber end surface can be polished with a preferable angle and surface accuracy. Specifically, a zirconia ferrule, a glass ferrule, Examples include plastic ferrules and metal ferrules. Examples of the condensing lens disposed between the capillary and the laser diode include the above-described aspherical lens, spherical lens, rod lens, and diffractive lens.

By the way, in such an optical module, an optical isolator may be added to the laser diode in order to stabilize the wavelength of the oscillation light from the laser diode. Such an optical isolator is indispensable when a standard specification with a signal transmission speed of 2.4 gigabits / second or more and a transmission distance of 10 km or more is required. A structure in which a polarizer, a glass polarizer or a birefringent polarizer, and a magnet are combined. As the Faraday rotator, it is preferable to use a magnetic garnet produced by a liquid phase epitaxial growth method. Examples of the glass polarizer include a polar core manufactured by Corning, and CUPO manufactured by HOYA. Examples of the birefringent polarizer material include a rutile crystal, an yttrium vanadate crystal, a gadolinium vanadate crystal, and a lithium niobate crystal. More preferably, a magnetic garnet crystal having a high coercive force is used for the Faraday rotator. If a garnet having a high holding force is used, it is not necessary to use a permanent magnet by magnetizing prior to active alignment, so the number of parts can be reduced and the size can be reduced. Examples of the garnet material having a high coercive force include a composition of Gd _1.4 Y _0.6 Bi _1.0 Fe _4.0 Ga _1.0 O ₁₂ .

  In any case, in such an optical module, it is desirable to perform alignment with respect to each optical element as easily as possible. Marking is made in advance at a position where each optical element is to be arranged, and each optical element is applied to the marking. A passive adjustment method may be performed by arranging the elements, and an alignment operation may be performed by performing an active adjustment method when fixing and finely adjusting the optical arrangement.

  On the other hand, the optical multiplexer / demultiplexer according to the present invention is adapted to the number of wavelength multiplexing required for the outer side on the one side and the other side of the opposing wall surface outside the housing formed to transmit a predetermined number of light beams. A function to combine and demultiplex many different wavelengths of light with an input / output port and a structure that couples light spatially by appropriately combining wavelength filters and total reflection mirrors in the housing It is.

  Any material can be used for the housing here as long as it can be used as a case such as glass, plastic, ceramics, etc., in addition to metals such as stainless steel, hastelloy, and kovar.

  As an input / output port, a fiber collimator can be exemplified. However, as a fiber collimator, a fiber is inserted and fixed in a capillary made of glass, zirconia, plastic or metal, and the end face is polished at a predetermined angle and accuracy. The thing of the structure which combined the pigtail fiber and lens which were made is illustrated. As the input / output port, it is also possible to use a configuration in which alignment and fixing are performed later with a fiber, a laser diode, and a photodiode that are to be coupled using only a lens. Examples of the lens (including the condensing function) constituting the fiber collimator include an aspherical lens, a spherical lens, a rod lens, and a diffraction lens. Examples of the rod lens include a rod lens whose end face is processed into a C lens, a GRIN (Graded Index) lens, a D lens whose spherical lens is processed into a rod shape, and the like. Examples of the pigtail fiber include a normal single-mode fiber, a dispersion-shifted single-mode fiber, a single-mode fiber that can reduce the bending radius, and a polarization-maintaining single-mode fiber.

  It is desirable to use a wavelength filter or a total reflection mirror having a structure in which a dielectric multilayer film is formed on an optical glass substrate. As a glass material of the optical glass substrate, various optical glasses can be used in addition to quartz glass and Pyrex (registered trademark) glass. As the substrate, in addition to ordinary optical glass, a polymer substrate such as polyimide may be used. Further, when used as a total reflection mirror, it is not a problem to use a metal, light-absorbing glass, crystal substrate, or the like. No. As the light-transmitting substrate, a polymer material or an optical crystal can be used in addition to optical glass. However, when the influence of birefringence is not preferable, it is desirable to use optical glass. Note that the translucency is not a problem as long as it is guaranteed in the used wavelength region.

  It is desirable to adjust the optical axis in the optical multiplexer / demultiplexer of the present invention as easily as possible. That is, marking is performed in advance on the place where each optical element such as a wavelength filter and a total reflection mirror to be used is to be placed, and each optical element is placed with respect to those markings by a passive adjustment method. After adjusting the optical axis, the optical axis may be adjusted by an active adjustment method when fixing with an adhesive or the like. As a method for fixing each optical element, when a fiber collimator is fixed, metal solder or glass solder, welding with a YAG laser, or an optical adhesive is exemplified. In the case of fixing the wavelength filter and the total reflection mirror, it is exemplified that metal solder or glass solder is used in addition to using an optical adhesive.

  In the following, some examples will be given, and the optical module of the present invention will be specifically described including its manufacturing process and alignment work.

  FIG. 1 is a schematic diagram illustrating a basic configuration of an optical module according to Embodiment 1 of the present invention. This optical module is a three-wave multiplexing optical transceiver module corresponding to an upstream signal wavelength of 1.3 μm, a downstream signal wavelength of 1.49 μm, and a downstream video signal wavelength of 1.55 μm. This corresponds to an example based on the configuration to the tenth configuration (including the first configuration to the fourth configuration, the sixth configuration, and the seventh configuration).

  In the optical transceiver module according to the first embodiment, as a preparation before the manufacturing process, first, a holding unit for holding the laser diode 2, the photodiodes 3 and 4, and the fiber collimator 5 with respect to the stainless steel casing 1 As an optical element disposed in the housing 1, the dielectric filter is a dielectric multi-layer film, and the total reflection wavelength filters 6 and 7 are divided into functions as wavelength filters, and for wavelength separation. Filters 8 and 9, a condenser lens 10, a coupling lens 11 and 12, a collimator lens 13, and a capillary 14 incorporating a fiber, which are divided into functions in light handling, are prepared. Marking for positioning was performed. Further, pinholes necessary for the alignment operation of the laser diode 2 were formed at predetermined positions on the wall surface (end surface) of the housing 1 on the fiber collimator 5 side facing the laser diode 2.

  Prior to assembling and manufacturing the optical transceiver module according to the first embodiment, the optical transceiver module according to the first embodiment is compared with the optical transceiver module according to the first embodiment. The assembly was made without the capillary 14 and other optical elements, and was used for comparison.

  When manufacturing such an optical transceiver module of the comparative study example, first, the emitted light having a wavelength of 1.3 μm from the laser diode 2 is converted into parallel light by the collimator lens 13 and provided on the end face of the casing 1 on the light beam. The light emitted from the pinhole was received by the fiber collimator 5 and fine alignment of the laser diode 2, the collimator lens 13, and the fiber collimator 5 was performed so that the light intensity was maximized. This alignment operation took 40 minutes, but the optical loss including the fiber collimator 5 was 5 dB. The position of the fiber collimator 5 of the comparative study example is set to the same distance as the case where the light beam is folded back by the total reflection wavelength filter 6 and the wavelength separation filter 9 required for the configuration of the first embodiment with respect to the laser diode 2 in advance. ing.

  Next, a total reflection wavelength filter 6 that acts as a total reflection mirror with respect to light having a wavelength of 1.3 μm, light having a wavelength of 1.49 μm and a wavelength of 1.55 μm are transmitted, and light having a wavelength of 1.3 μm is transmitted. The wavelength separation filter 9 acting as a total reflection mirror is arranged at a marked position by a dedicated handling jig linked to a micrometer. Further, after the fiber collimator 5 is mounted on the holding portion, the total reflection wavelength filter 6 and the wavelength separation filter 9 are finely adjusted using a micrometer to introduce light from the laser diode 2 into the fiber collimator 5 (pin The light emitted from the hole is received at a predetermined position by the fiber collimator 5), and the alignment work including the fiber collimator 5 is performed so that the light intensity becomes maximum. Although this alignment operation took as long as 3 hours, the coupling loss due to the folding of the light beam by the two filters (the total reflection wavelength filter 6 and the wavelength separation filter 9) was described above. It became 6 dB or more in addition to 5 dB, and exceeded 11 dB in total, and it was found that the desired 8 dB or less could not be suppressed.

  On the other hand, in the optical transmission / reception module of Example 1, the alignment work for returning the light from the laser diode 2 by the total reflection wavelength filter 6 and the wavelength separation filter 9 and coupling to the fiber collimator 5 was performed.

  First, alignment is performed to condense light from the laser diode 2 onto a fiber core of a capillary (having a built-in fiber and polished on both ends) positioned on a marking provided in advance by a condenser lens 10; Light emitted from the fiber built in the capillary 14 was converted into parallel light by the collimator lens 13. Here, by finely adjusting the laser diode 2, the condensing lens 10, the collimator lens 13, and the fiber collimator 5, the light emitted from the pinhole is transmitted by the fiber collimator 5 as in the comparative example described above. The alignment work was performed so as to be received at a predetermined position. Although this alignment work was less than 15 minutes, the loss including the fiber collimator 5 was 3 dB. Note that the optical axis of the fiber built in the capillary 14 is positioned with high accuracy by using a micrometer on the optical axis that should be originally, and the angular deviation from the optical axis of the laser diode 2 can be accurately corrected. it can.

  Subsequently, as in the case of the comparative study described above, the total reflection wavelength filter 6 and the wavelength separation filter 9 that act as a total reflection mirror with respect to light having a wavelength of 1.3 μm are respectively placed on the micrometers at the marked positions. It is arranged by a dedicated handling jig that is linked, and both the total reflection wavelength filter 6 and the wavelength separation filter 9 are finely adjusted by a micrometer, and the light from the laser diode 2 is introduced into the fiber collimator 5 to obtain the light intensity. Alignment was performed so that the Although this alignment operation only takes 15 minutes, the coupling loss due to the folding of the light beam by the two filters (total reflection wavelength filter 6 and wavelength separation filter 9) is In addition to the above-described 3 dB, it was 2 dB or less, and the total was less than 5 dB, and the desired 8 dB or less could be suppressed.

  The above results mean that the allowable tilt angle from the optical axis of the emitted light from the laser diode 2 depends greatly on the presence or absence of the capillary 14 incorporating the fiber. That is, in the absence of the capillary 14 that is a component of the optical transceiver module of the first embodiment, it is inevitable that the light of the laser diode 2 is slightly tilted with respect to the optical axis due to the limit of the alignment equipment. When the light is emitted from the pinhole through the collimator lens 13 and received by the fiber collimator 5, the loss is increased as compared with the optimum alignment.

  When there is such a tilt angle shift, the angle shift doubles each time when the light is reflected by the total reflection mirror. This is because the incident angle and the reflection angle are the same, and therefore the incident angle deviation and the reflection angle deviation are equal and added. In this configuration, since the total angle deviation becomes four times by using two total reflection mirrors, in the comparative study example, the increase in loss is unavoidable due to the large influence of the angle deviation. It is. The influence of the angle deviation is large because the cross-sectional area of the emitting part of the laser diode 2 is very small (diameter φ = 1 μm) and the refractive index is large, so the spreading angle of the emitted light becomes large. It is easy.

  The capillary 14 with a built-in fiber is positioned in advance with a high precision with respect to a preferable optical axis. It is relatively easy to combine with the above in consideration of the angular deviation of the light emitted from the laser diode 2. The coupled light is confined to the fiber and its direction is corrected to the optical axis of the fiber. That is, the role of the fiber built in the capillary 14 is to correct the angular deviation of the laser diode 2 with high accuracy.

  Since the optical axis can be corrected in this way, even if the optical path is changed using a total reflection mirror, the influence of the angle deviation can be extremely reduced, and the coupling between the laser diode 2 and the fiber collimator 5 can be achieved. The efficiency can be increased and the optical axis can be corrected, so that the time required for alignment can be greatly shortened. As a result, the laser diode 2 and the fiber collimator 5 can be adjusted with high accuracy. A wick can be made.

  Next, two wavelengths of light having a wavelength of 1.49 μm and a wavelength of 1.55 μm are incident from the fiber collimator 5, and the two wavelengths of light having passed through the wavelength separation filter 9 are totally reflected with respect to the light having a wavelength of 1.55 μm. Separated by another wavelength separation filter (dielectric filter made of a dielectric multilayer film) 8 acting as The light having a wavelength of 1.55 μm reflected by the wavelength separation filter 8 is turned back by the total reflection wavelength filter 7 acting as a total reflection mirror and enters the photodiode 3 for wavelength 1.55 μm via the coupling lens 11. To do. Prior to bringing the photodiode 3, it is also possible to confirm the separation ratio with light having a wavelength of 1.49 μm using another fiber collimator.

  In order to increase the coupling efficiency, the total reflection wavelength filter 7, the wavelength separation filter 8, the coupling lens 11, and the photodiode 3 were finely adjusted with a micrometer. Since the dependence on the incident angle is small, the laser diode 2 is not so difficult without using a capillary.

  Further, the light having a wavelength of 1.49 μm that has passed through the wavelength separation filter 8 is incident on the photodiode 4 having a wavelength of 1.49 μm by the coupling lens 12. Adjusting the positions of the coupling lens 12 and the photodiode 4 to increase the coupling efficiency is the same as in the case of the wavelength of 1.55 μm described above.

  Thus, the manufacture of the optical transceiver module according to Example 1 was completed. Preferred features of the optical transceiver module according to the first embodiment are that the coupling efficiency of light from the laser diode 2 is high, the time required for alignment is shortened, and a wavelength filter that acts as a total reflection mirror for a specific wavelength There are various points such as that the laser diode 2 and the photodiodes 3 and 4 can be arranged on a preferable end face of the housing 1 by using two or more of the above.

  In the optical transceiver module according to the first embodiment, a fiber collimator is used instead of the combination of the photodiodes 3 and 4 and the coupling lenses 11 and 12, and the light received by the photodiodes 3 and 4 is guided by the pigtail fiber. There is no problem even if it is changed. In the optical transceiver module according to the first embodiment, the wavelength 1.31 μm, the wavelength 1.49 μm, and the wavelength 1.55 μm are used for the upstream signal, the downstream signal, and the video signal, respectively. It can be arbitrarily selected according to the application. However, in this case, the wavelength filter may be matched with the selected wavelength. Further, depending on the transmission speed, it is also effective to add an optical isolator having a dedicated wavelength to the laser diode 2 separately.

  FIG. 2 is a schematic diagram illustrating a basic configuration of an optical module according to Embodiment 2 of the present invention. This optical module is a three-wave multiplexing optical transceiver module corresponding to an upstream signal wavelength of 1.3 μm, a downstream signal wavelength of 1.49 μm, and a downstream video signal wavelength of 1.55 μm. This corresponds to other examples based on the first to tenth configurations (including the first configuration to the fourth configuration, the sixth configuration, and the seventh configuration).

  In the optical transceiver module according to the second embodiment, as preparation before the manufacturing process, first, as in the case of the first embodiment, the laser diode 16, the photodiodes 17, 18 and the fiber are formed on the stainless steel casing 15. A holding part for holding the collimator 19 is processed, and each of them is a dielectric filter made of a dielectric multilayer film as an optical element arranged in the housing 15, and is used as a wavelength filter for total reflection. The wavelength filters 22 and 23, the wavelength separation filters 20 and 21, the condenser lens 24, the coupling lenses 25 and 26, the collimator lens 27, and the capillaries 28 with built-in fibers, which are divided into functions for handling light. Each of these optical elements was prepared and marked for approximate positioning. Also in this case, pinholes necessary for the alignment operation of the laser diode 16 are formed at predetermined positions on the wall surface (end surface) of the housing 15 on the fiber collimator 19 side facing the laser diode 16.

  Prior to active alignment, the wavelength separation filter 21 that reflects light having a wavelength of 1.55 μm and transmits light having a wavelength of 1.49 μm and 1.31 μm and a light having a wavelength of 1.49 μm are reflected. In addition, a wavelength separation filter 20 that transmits light having a wavelength of 1.31 μm was positioned and fixed by a handling jig interlocked with a micrometer according to the marking.

  Next, alignment work for passing the light from the laser diode 16 through the two wavelength separation filters 20 and 21 and coupling the light to the fiber collimator 19 was performed. Here, alignment is first performed by condensing the light from the laser diode 16 onto the fiber core of a capillary 28 (with a built-in fiber and polished on both ends) positioned on a marking previously applied by a condenser lens 24. The collimator lens 27 converted the emitted light from the fiber built in the capillary 28 into parallel light. The laser diode 16, the condensing lens 24, the capillary 28, the collimator lens 27, and the fiber collimator 19 were finely adjusted to perform alignment work so that the coupling efficiency was maximized. Although the alignment work was less than 10 minutes, the coupling loss including the fiber collimator 19 was 3 dB or less. Note that the optical axis of the fiber built in the capillary 28 is positioned with high accuracy by using a micrometer on the optical axis that should originally be, and the angular deviation of the laser diode 16 from the optical axis can be accurately corrected. it can.

  Subsequently, two wavelengths of light having a wavelength of 1.49 μm and a wavelength of 1.55 μm were incident from the fiber collimator 19 and separated by the wavelength separation filter 21.

  Since the wavelength separation filter 21 acts as a total reflection mirror for light having a wavelength of 1.55 μm, the light having a wavelength of 1.55 μm reflected here is folded back by the total reflection wavelength filter 23 acting as a total reflection mirror. Then, it enters the photodiode 18 for wavelength 1.55 μm through the coupling lens 26. Prior to using the photodiode 18, it is also possible to confirm the separation ratio with light having a wavelength of 1.49 μm using another fiber collimator.

  In order to increase the coupling efficiency, the total reflection wavelength filter 23, the coupling lens 26, and the photodiode 18 are finely adjusted with a micrometer. Due to the small angle dependence, there was no difficulty as much as the laser diode 16 without using a capillary.

  Further, the light having a wavelength of 1.49 μm that has passed through the wavelength separation filter 21 is reflected by the wavelength separation filter 20, is further folded by the total reflection wavelength filter 22 that acts as a total reflection mirror, and then is coupled by the coupling lens 25. The light enters the photodiode 17 for a wavelength of 1.49 μm. Adjusting the positions of the total reflection wavelength filter 22, the coupling lens 25, and the photodiode 17 to increase the coupling efficiency is the same as in the case of the wavelength of 1.55 μm described above.

  Thus, the manufacture of the optical transceiver module according to Example 2 was completed. As in the case of the first embodiment, the preferred characteristics of the optical transceiver module according to the second embodiment are that the coupling efficiency of light from the laser diode 16 is high, the time required for the alignment work can be shortened, and for a specific wavelength. In addition, the use of two or more wavelength filters acting as total reflection mirrors makes it possible to arrange the laser diode 16 and the photodiodes 17 and 18 on a preferable end face of the housing 15. Further, the selection of the wavelength can be arbitrarily made in the same manner as described in the first embodiment, and the same applies to the effectiveness of separately adding an optical isolator having a dedicated wavelength to the laser diode 16 depending on the transmission speed.

  FIG. 3 is a schematic diagram illustrating a basic configuration of an optical module according to Embodiment 3 of the present invention. This optical module multiplexes light from two laser diodes 32 and 33 that emit light having a wavelength of 1.49 μm and a wavelength of 1.51 μm, and transmits the multiplexed light through a single fiber. It is a module and corresponds to an example based on the first to fourth configurations described above.

  In the case of the optical transmission module according to the third embodiment, as a manufacturing procedure, as in the case of the first embodiment, holding for holding the laser diodes 32 and 33 and the fiber collimator 34 with respect to the stainless steel casing 31 is performed. The optical filter is a dielectric filter made of a dielectric multilayer film as an optical element disposed in the housing 31, and a total reflection wavelength filter 35 and a wavelength separation filter that are divided into functions as wavelength filters. 36, condensing lenses 37 and 39 and collimator lenses 38 and 40, which are divided into functions in light handling, and capillaries 41 and 42 containing fibers, and approximate positioning of these optical elements. Marked to do. Also in this case, a pinhole necessary for performing an alignment operation at an intermediate stage is formed at a predetermined position at a position facing the laser diode 32 on the wall surface (end surface) of the housing 31 on the fiber collimator 34 side. .

  Prior to the active alignment work of emitting the laser diode 33 and using the light, the wavelength separation filter 36 that reflects light having a wavelength of 1.49 μm and transmits light having a wavelength of 1.51 μm is marked in accordance with the marking. It was positioned and temporarily fixed by a handling jig interlocked with the micrometer. Further, a fiber collimator is disposed at the position where the laser diode 33 that emits light having a wavelength of 1.51 μm is to be placed so as to face the fiber collimator 34 on the light receiving side, and light having a wavelength of 1.51 μm is introduced into one fiber collimator. Thus, alignment was performed so that the loss of light intensity was minimized.

  Next, the alignment operation for reflecting the light from the laser diode 32 by the two total reflection wavelength filters 35 and the wavelength separation filter 36 and coupling it to the fiber collimator 34 was performed. Here, alignment is first performed by condensing the light from the laser diode 32 onto the fiber core of a capillary 41 (which has a built-in fiber and whose both end surfaces are polished) positioned at a marking provided in advance by a condenser lens 37. The light emitted from the fiber built in the capillary 41 was converted into parallel light by the collimator lens 38. Thereafter, the parallel light was received by another fiber collimator disposed at a relatively equal distance from the laser diode 32 through the pinhole described above to the fiber collimator 34. The alignment operation was performed so as to maximize the coupling efficiency by finely adjusting the laser diode 32, the condenser lens 37, the capillary 41, and the collimator lens 38.

  Subsequently, a total reflection wavelength filter 35 that acts as a total reflection mirror with respect to light having a wavelength of 1.49 μm is placed at the marking position by a handling jig interlocked with a micrometer. The separation filter 36 was finely adjusted with a micrometer so that the amount of light received from the laser diode 32 with a wavelength of 1.49 μm was maximized.

  Although these alignment operations were performed in less than 15 minutes, the coupling loss including the fiber collimator 34 was 3 dB or less. A micrometer is used to position the optical axis that should be originally positioned with high accuracy, and the angular deviation of the laser diode 32 from the optical axis can be accurately corrected.

  Next, a laser diode 33 that emits light having a wavelength of 1.51 μm is mounted, and the laser diode 33, the condensing lens 39, the capillary 42, and the collimator lens 40 are finely adjusted while the wavelength separation filter 36 is left as it is. Thus, alignment was performed so that the coupling efficiency of 1.51 μm wavelength light to the fiber collimator 34 was maximized. Although this alignment work was less than 10 minutes, the coupling loss including the fiber collimator 34 was 3 dB or less. The optical axis of the fiber built in the capillary 42 is positioned with high accuracy by using a micrometer on the optical axis that should be originally, and the angular deviation of the laser diode 33 from the optical axis can be accurately corrected. .

  Thus, the manufacture of the optical transmission module according to Example 3 was completed. The preferred characteristics of the optical transmission module according to the third embodiment are that, as in the first embodiment, the coupling efficiency of light from the laser diodes 32 and 33 is high, the time for alignment work can be shortened, and the specific wavelength is reduced. In addition, the use of two or more wavelength filters acting as total reflection mirrors makes it possible to arrange the laser diodes 32 and 33 on the preferable end face of the housing 31.

  In the optical transmission module according to the third embodiment, the wavelengths used are 1.49 μm and 1.51 μm, but these can be arbitrarily selected as in the above-described embodiments. The filter may be matched to the selected wavelength. Further, if the laser diodes 32 and 33 used here are replaced with photodiodes, they can be changed as an optical receiving module, and if an optical isolator having a dedicated wavelength is added to each of the laser diodes 32 and 33 depending on the transmission speed. Effectiveness is the same as that described in each of the above-described embodiments.

  FIG. 4 is a schematic diagram illustrating a basic configuration of an optical module according to Embodiment 4 of the present invention. This optical module multiplexes light from four laser diodes 52, 53, 54, and 55 that emit light having a wavelength of 1.49 μm, a wavelength of 1.51 μm, a wavelength of 1.53 μm, and a wavelength of 1.55 μm. This is an optical transmission module for four-wave multiplexing for transmission through a single fiber, and corresponds to other examples based on the first to fourth configurations described above.

  In the case of the optical transmission module according to the fourth embodiment, the manufacturing procedure is the same as in the first embodiment, in which four laser diodes 52, 53, 54, 55 and a fiber collimator are made with respect to the stainless steel casing 51. 56 is a dielectric filter made of a dielectric multilayer film as an optical element disposed in the housing 51, and the total reflection wavelength is divided into functions as a wavelength filter. Filters 57, 59, 61, wavelength separation filters 58, 60, 62, condenser lenses 63, 65, 67, 69, and collimator lenses 64, 66, 68, 70 that are divided into functions for handling light. The capillaries 71, 72, 73, and 74 containing the fibers were prepared, and markings for performing approximate positioning were applied to these optical elements. In this case, 3 is also necessary in order to perform the alignment work in the middle of the predetermined position at the position facing the laser diodes 52, 53, 54 on the wall surface (end face) of the housing 51 on the fiber collimator 56 side. Pinholes were formed at locations.

  Prior to an active alignment operation in which each of the laser diodes 52, 53, 54, and 55 emits light and uses the light, a wavelength that reflects light having a wavelength of 1.49 μm and transmits light having a wavelength of 1.51 μm Separation filter 58, wavelength separation filter 60 that reflects light in the wavelength range of 1.49 μm to 1.51 μm and transmits light of wavelength 1.53 μm, and wavelength 1.49 μm to wavelength 1.53 μm The wavelength separation filter 62 that reflects light in the range of 1.5 and transmits light having a wavelength of 1.55 μm was positioned and temporarily fixed by a handling jig interlocked with the micrometer according to the marking.

  Next, alignment work was performed to couple the light from the three laser diodes 52, 53, and 54 to the three fiber collimators arranged for preliminary alignment through pinholes. Here, first, a capillary in which light from the laser diodes 52, 53, and 54 is positioned on a marking provided in advance by the condenser lenses 63, 65, and 67 (both incorporate a fiber and both end surfaces are polished). Alignment for focusing on the fiber cores 71, 72, and 73 was performed, and emitted light from the fibers built in the capillaries 71, 72, and 73 was converted into parallel light by collimator lenses 64, 66, and 68, respectively. Thereafter, each parallel light was received by another three fiber collimators arranged at a relatively equal distance from the laser diodes 52, 53, and 54 through the three pinholes described above. By finely adjusting the laser diodes 52, 53, 54, the condenser lenses 63, 65, 67, the capillaries 71, 72, 73, and the collimator lenses 64, 66, 68, respectively, the coupling efficiency is adjusted to the maximum. The core work was done.

  Subsequently, a total reflection wavelength filter 57 that acts as a total reflection mirror with respect to light having a wavelength of 1.49 μm is placed at the marking position by a handling jig interlocked with the micrometer, and the total reflection wavelength filter 57 is set to the micrometer. The light having a wavelength of 1.49 μm from the laser diode 52 is reflected by the wavelength separation filter 58 and received by the fiber collimator disposed in the pinhole facing the laser diode 53. I tried to be the maximum. At this time, the optical axes of the laser diodes 52 and 53 coincide.

  Similarly, a total reflection wavelength filter 59 that acts as a total reflection mirror for light having a wavelength of 1.49 μm or a wavelength of 1.51 μm is arranged at the marking position by a handling jig interlocked with a micrometer, and the total reflection wavelength. The filter 59 is finely adjusted by a micrometer so that light having a wavelength of 1.49 μm and a wavelength of 1.51 μm from the laser diodes 52 and 53 is reflected by the wavelength separation filter 60 and disposed in a pinhole facing the laser diode 54. The fiber collimator receives light and maximizes the amount of light received. At this time, the optical axes of the laser diodes 52 and 53 coincide.

  Further, similarly, a total reflection wavelength filter 61 that acts as a total reflection mirror with respect to light having a wavelength of 1.49 μm or 1.53 μm is disposed at a marking position by a handling jig interlocked with a micrometer. The reflection wavelength filter 61 is finely adjusted by a micrometer so that light of a wavelength of 1.49 μm, a wavelength of 1.51 μm, and a wavelength of 1.53 μm from the laser diodes 52, 53, and 54 is received by the fiber collimator 56, and the amount of received light Was maximized.

  Finally, a laser diode 55 that emits light having a wavelength of 1.55 μm is attached, and the laser diode 55, the condensing lens 69, the capillary 74, and the collimator lens 70 are finely adjusted while the wavelength separation filter 62 is left as it is. Thus, the alignment operation was performed so that the coupling efficiency of the light having the wavelength of 1.55 μm to the fiber collimator 56 was maximized. By this alignment operation, the optical axes of the four laser diodes 52, 53, 54, and 55 all coincide.

  Even though these alignment operations were performed in less than 50 minutes, the coupling loss including the fiber collimator 56 was 3 dB or less for all four wavelengths. The optical axes of the fibers built in the capillaries 71, 72, 73, and 74 are positioned with high accuracy by using a micrometer on the optical axis that should be, and the optical axes of the laser diodes 52, 53, 54, and 55 Can be accurately corrected.

  Thus, the manufacture of the optical transmission module according to Example 4 was completed. The preferred characteristics of the optical transmission module according to the fourth embodiment are that the light coupling efficiency from the laser diodes 52, 53, 54, and 55 is high and the alignment work time can be shortened, as in the first embodiment. There are various points such as that laser diodes 52, 53, 54, and 55 can be arranged on a preferable end face of the casing 51 by using two or more wavelength filters that act as total reflection mirrors for a specific wavelength.

  In the optical transmission module according to the fourth embodiment, the wavelengths used are 1.49 μm, 1.51 μm, 1.53 μm, and 1.55 μm. In this case, the wavelength filter may be matched with the selected wavelength. Further, if the laser diodes 52, 53, 54, 55 used here are replaced with photodiodes, they can be changed as optical receiving modules, and each laser diode 52, 53, 54, 55 is separately dedicated depending on the transmission speed. The fact that it is effective to add an optical isolator having a wavelength is the same as the case described in each of the above embodiments.

  FIG. 5 is a schematic diagram illustrating a basic configuration of an optical module according to Embodiment 5 of the present invention. This optical module multiplexes light from four laser diodes 82, 83, 84, and 85 that emit light having a wavelength of 1.57 μm, a wavelength of 1.59 μm, a wavelength of 1.61 μm, and a wavelength of 1.63 μm. This is an optical transmission module for four-wave multiplexing for transmission using a single fiber, and corresponds to another example based on the first to fourth configurations (including the fifth configuration) described above.

  In the case of the optical transmission module according to the fifth embodiment, the manufacturing procedure is the same as in the fourth embodiment, in which four laser diodes 82, 83, 84, 85 and a fiber collimator are made with respect to the stainless steel casing 81. 86 is a dielectric filter made of a dielectric multilayer film as an optical element disposed in the casing 81, and the total reflection wavelength is divided into functions as a wavelength filter. Filters 87, 89, 90, wavelength separation filters 88, 91, 92; condensing lenses 93, 95, 97, 99, and collimator lenses 94, 96, 98, 100, which are divided into functions in light handling; Prepare capillaries 101, 102, 103, and 104 containing fibers and an optical isolator 105, and perform approximate positioning of each of these optical elements. It was subjected to a marking for. In this case, 3 is also necessary in order to perform alignment work in the middle of a predetermined position at a position facing the laser diodes 82, 83, 84 on the wall surface (end face) of the housing 81 on the fiber collimator 86 side. Pinholes were formed at locations.

  Prior to an active alignment operation in which each of the laser diodes 82, 83, 84, and 85 emits light and uses the light, a wavelength that reflects light having a wavelength of 1.57 μm and transmits light having a wavelength of 1.59 μm A separation filter 88, a wavelength separation filter 91 that reflects light having a wavelength of 1.61 μm and transmits light having a wavelength of 1.63 μm, and light in a range from a wavelength of 1.57 μm to a wavelength of 1.59 μm; In addition, a wavelength separation filter 92 that transmits light in a wavelength range of 1.61 μm to 1.63 μm was positioned and temporarily fixed by a handling jig interlocked with a micrometer according to each marking.

  Next, alignment work was performed to couple the light from the three laser diodes 82, 83, and 84 to the three fiber collimators arranged for preliminary alignment through the pinholes. Here, first, a capillary in which light from the laser diodes 82, 83, 84 is positioned in a pre-marked by the condensing lenses 93, 95, 97 (both contain a fiber and both end faces are polished). Alignment for focusing on the fiber cores 101, 102, and 103 was performed, respectively, and emitted light from the fibers built in the capillaries 101, 102, and 103 was converted into parallel light by the collimator lenses 94, 96, and 98, respectively. Thereafter, each parallel light was received by another three fiber collimators arranged at a distance relatively equal to the fiber collimator 86 from the laser diodes 82, 83, and 84 through the above-described three pinholes. By finely adjusting the laser diodes 82, 83, and 84, the condenser lenses 93, 95, and 97, the capillaries 101, 102, and 103, and the collimator lenses 94, 96, and 99, the coupling efficiency is adjusted to maximize. The core work was done.

  Subsequently, a total reflection wavelength filter 87 that acts as a total reflection mirror with respect to light having a wavelength of 1.57 μm is disposed at the marking position by a handling jig interlocked with the micrometer, and the total reflection wavelength filter 87 is set to the micrometer. And the light having a wavelength of 1.57 μm from the laser diode 82 is reflected by the total reflection wavelength filter 88 and received by the fiber collimator disposed in the pinhole facing the laser diode 83. Was maximized. At this time, the laser diodes 82 and 83 have the same optical axis.

  In addition, a total reflection wavelength filter 89 that acts as a total reflection mirror for light in the wavelength range from 1.57 μm to 1.59 μm is placed at the marking position by a handling jig linked to a micrometer, and is totally reflected. The wavelength filter 89 is finely adjusted with a micrometer so that light with wavelengths of 1.57 μm and 1.59 μm from the laser diodes 82 and 83 is reflected by the wavelength separation filter 92 and received by the fiber collimator 86 on the light receiving side. The amount of light received was maximized. At this point, the optical axes of the laser diodes 82 and 83 and the fiber collimator 86 coincide.

  Further, similarly, a total reflection wavelength filter 90 that acts as a total reflection mirror for light having a wavelength of 1.61 μm is disposed at a marking position by a handling jig interlocked with a micrometer, and the total reflection wavelength filter 90 is arranged. Was adjusted finely by a micrometer, and the light having a wavelength of 1.61 μm from the laser diode 84 was reflected by the wavelength separation filter 91 and received by the fiber collimator 86 so that the amount of received light was maximized. At this time, the optical axes of the laser diodes 82, 83, and 84 coincide.

  In addition, a laser diode 85 that emits light having a wavelength of 1.63 μm is attached, and the laser diode 85, the condensing lens 99, the capillary 104, and the collimator lens 100 are finely left with the wavelength separation filters 91 and 92 as they are. The alignment was performed so that the coupling efficiency of the light having a wavelength of 1.63 μm to the fiber collimator 86 was maximized. By this alignment operation, the optical axes of the four laser diodes 82, 83, 84, 85 all coincide.

  Finally, an optical isolator 105 that can cover the entire wavelength range of the laser diodes 82, 83, 84, 85 immediately before the fiber collimator 86 (light from the laser diodes 84, 85 that passes through the wavelength separation filter 92, or a wavelength separation filter) The laser diodes 82 and 83 that are totally reflected by the beam 92 are incident and directed to the fiber collimator 86 to emit the light, and the positions of the optical isolator 105 and the fiber collimator 86 are finely controlled. . The incorporation of such an optical isolator 105 is relatively easy because the optical axes of the four laser diodes 82, 83, 84, and 85 coincide with each other, but the optical isolator 105 itself has a sufficiently large return loss. Thus, it is sufficient to consider the polishing angle of the end face, the incident / reflection angle to the wavelength filter, the antireflection film, and the like.

  Although these alignment operations were less than 50 minutes, the coupling loss including the fiber collimator 86 was 3 dB or less for all four wavelengths. The optical axes of the fibers incorporated in the capillaries 101, 102, 103, and 104 are positioned with high accuracy by using a micrometer on the optical axis that should be originally, and the optical axes of the laser diodes 82, 83, 84, and 85 Can be accurately corrected.

  Thus, the manufacture of the optical transmission module according to Example 5 was completed. The preferred characteristics of the optical transmission module according to the fifth embodiment are that the light coupling efficiency from the laser diodes 82, 83, 84, 85 is high, and the alignment work time can be shortened, as in the first embodiment. There are various points such as that laser diodes 82, 83, 84, and 85 can be arranged on a preferable end face of the casing 81 by using two or more wavelength filters that act as total reflection mirrors for a specific wavelength.

  In the optical transmission module according to the fifth embodiment, the wavelengths used are 1.57 μm, 1.59 μm, 1.61 μm, and 1.63 μm, but this is also arbitrary as in the case described in the above-described embodiments. In this case, the wavelength filter may be matched with the selected wavelength. Further, if the laser diodes 82, 83, 84, 85 used here are replaced with photodiodes, they can be changed as optical receiving modules, and each laser diode 82, 83, 84, 85 is separately dedicated depending on the transmission speed. The fact that it is effective to add an optical isolator having a wavelength is the same as the case described in each of the above embodiments.

  Incidentally, in each of the embodiments described above, the optical transceiver module for performing three-wave multiplexing of the wavelength 1.31 μm, the wavelength 1.49 μm, and the wavelength 1.55 μm in the first embodiment, and the wavelength 1.3 μm in the second embodiment. , An optical transmission / reception module for performing three-wave multiplexing of a wavelength of 1.49 μm and a wavelength of 1.55 μm, an optical transmission module for multiplexing a wavelength of 1.49 μm and a wavelength of 1.51 μm in the third embodiment, and in the fourth embodiment An optical transmission module for performing four-wave multiplexing with a wavelength of 1.49 μm, a wavelength of 1.51 μm, a wavelength of 1.53 μm, and a wavelength of 1.55 μm, and in Example 5, a wavelength of 1.57 μm, a wavelength of 1.59 μm, and a wavelength of 1.61 μm , And an optical transmission module for performing four-wave multiplexing at a wavelength of 1.63 μm, the optical module of the present invention can simply increase the number of wavelength filters, or By combining optical modules such as wave multiplexing and four wave multiplexing, it is also possible to construct an optical transmission module, an optical reception module, or an optical transmission / reception module of four or more wave multiplexing such as eight wave multiplexing and sixteen wave multiplexing. In addition, it can be applied to a high-density wavelength division multiplexing (DWDM) optical module having a very narrow wavelength interval by appropriately combining a wavelength filter using a dielectric multilayer film together with a laser diode and a photodiode. It is not limited to the thing of the form.

  Hereinafter, the optical multiplexer / demultiplexer of the present invention will be described in detail with reference to some examples, including its manufacturing process.

  FIG. 6 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 6 of the present invention.

  The optical multiplexer / demultiplexer according to the sixth embodiment includes a housing 120 having a first side surface (right side surface in the drawing) and a second side surface (left side surface in the drawing) facing each other.

  A fiber collimator 121 as a first input / output port is disposed on the first side surface of the housing 120, and the second input / output port through the second input / output port are provided on the second side surface of the housing 120. Fiber collimators 122 to 125 as 5 input / output ports are arranged. These input / output ports may be referred to as optical signal input / output means, and in the case shown in the figure, are configured by a fiber collimator including an optical fiber and a lens. Here, the optical fiber and the lens are arranged at a position where the optical signal becomes collimated light.

  The fiber collimator 121 is for entering / exiting an optical signal having a wavelength group including first to fourth wavelengths λ <b> 1 to λ <b> 4 different from each other. The fiber collimators 122 to 125 are used to input and output optical signals having the first to fourth wavelengths λ1 to λ4, respectively.

  The casing 120 is composed of first to fourth light transmission means (hereinafter referred to as “light transmission” in the following description). Or a movement according to a predetermined optical path including reflection on the surface of the medium. Further, in the case 120, there are disposed a wavelength selection filter made up of five dielectric multilayers described later and three total reflection mirrors. The wavelength selective filter using the dielectric multilayer film may be simply called a wavelength filter.

  The first light transmission means transmits the optical signal having the first wavelength λ1 incident from the fiber collimator 121 (first input / output port) toward the fiber collimator 122 (second input / output port), and An optical signal having the first wavelength λ1 incident from the fiber collimator 122 (second input / output port) is transmitted toward the fiber collimator 121 (first input / output port).

  The second light transmission means transmits an optical signal having the second wavelength λ2 incident from the fiber collimator 121 (first input / output port) toward the fiber collimator 123 (third input / output port), and An optical signal having the second wavelength λ2 incident from the fiber collimator 123 (third input / output port) is transmitted toward the fiber collimator 121 (first input / output port).

  The third light transmission means transmits the optical signal having the third wavelength λ3 incident from the fiber collimator 121 (first input / output port) toward the fiber collimator 124 (fourth input / output port), and An optical signal having the third wavelength λ3 incident from the fiber collimator 124 (fourth input / output port) is transmitted toward the fiber collimator 121 (first input / output port).

  The fourth light transmission means transmits the optical signal having the fourth wavelength λ4 incident from the fiber collimator 121 (first input / output port) toward the fiber collimator 125 (fifth input / output port), and An optical signal having a fourth wavelength λ4 incident from the fiber collimator 125 (fifth input / output port) is transmitted toward the fiber collimator 121 (first input / output port).

  In the example shown in FIG. 6, the first light transmission means includes a first wavelength filter 126 and a second wavelength filter 127. The first wavelength filter 126 is disposed between the first side surface and the second side surface of the housing 120, and transmits an optical signal having the first wavelength λ1 and the second wavelength λ2. The optical signal having the third wavelength λ3 and the fourth wavelength λ4 is reflected. The second wavelength filter 127 is disposed between the first wavelength filter 6 and the second side surface of the housing in the vicinity of the fiber collimator 122 (second input / output port), and has a first wavelength. An optical signal having λ1 is transmitted and an optical signal having the second wavelength λ2 is reflected.

  The second light transmission means includes the first wavelength filter 126 and the second wavelength filter 127, the third wavelength filter 128, and the total reflection mirror (simply called a mirror) as the first reflection means. It is also good) 131. The third wavelength filter 128 is disposed in the vicinity of the fiber collimator 123 (third input / output port) and transmits only an optical signal having the second wavelength λ2. The first reflecting means 131 reflects the optical signal having the second wavelength λ2 reflected by the second wavelength filter 127 toward the third wavelength filter 128, and the fiber collimator 123 (third incident / exit). The optical signal having the second wavelength λ 2 that has entered the housing 120 from the port) and transmitted through the third wavelength filter 128 is reflected toward the second wavelength filter 127. In the example shown in FIG. 6, the first reflecting means is constituted by a total reflection mirror.

  The third light transmission means includes the first wavelength filter 126, the fourth wavelength filter 129, and the second total reflection mirror 132 as the second reflection means. The fourth wavelength filter 129 is disposed in the vicinity of the fiber collimator 124 (fourth input / output port), transmits an optical signal having the third wavelength λ3, and has the fourth wavelength λ4. Reflect the signal. The second mirror 132 is disposed on the first side surface side of the housing 120 and receives the optical signal having the third wavelength λ3 and the fourth wavelength λ4 reflected by the first wavelength filter 126. An optical signal having the third wavelength λ3 reflected toward the fourth wavelength filter 129 and transmitted through the fourth wavelength filter 129, and an optical signal having the fourth wavelength reflected by the fourth wavelength filter 129; Is reflected toward the first wavelength filter 126.

  The fourth light transmission means includes the first wavelength filter 126 and the fourth wavelength filter 129, the fifth wavelength filter 130, and the third total reflection mirror 133 as the third reflection means. ing. The fifth wavelength filter 130 is disposed in the vicinity of the fiber collimator 125 (fifth input / output port) and transmits only an optical signal having the fourth wavelength λ4. The third total reflection mirror 133 reflects the optical signal having the fourth wavelength λ 4 reflected by the fourth wavelength filter 129 toward the fifth wavelength filter 130, and the fiber collimator 125 (fifth input). The optical signal having the fourth wavelength λ 4 that is incident on the housing 120 from the output port) and transmitted through the fifth wavelength filter 130 is reflected toward the fourth wavelength filter 129.

  The fiber collimators 121 and 122 are arranged on a substantially straight line so that the first optical axes of the light rays entering and exiting the fiber collimators 121 and 122 substantially coincide with each other. The wavelength filters 126 and 127 are arranged at predetermined angles on the first optical axis.

  In the mirrors 131 to 133, the second to fourth optical axes of light rays entering and exiting the fiber collimators 123 to 125 are substantially parallel to the first optical axis of light rays from the fiber collimator 121 to the fiber collimator 122. As described above, they are arranged at predetermined angles with respect to the second optical axis to the fourth optical axis, respectively.

  The optical signal having the first wavelength λ 1 is optically coupled between the fiber collimators 121 and 122 via the wavelength filters 126 and 127. The optical signal having the second wavelength λ <b> 2 is optically coupled between the fiber collimators 121 and 123 via the wavelength filters 126 to 128 and the mirror 131. The optical signal having the third wavelength λ 3 is optically coupled between the fiber collimators 121 and 124 via the wavelength filters 126 and 129 and the mirror 132. The optical signal having the fourth wavelength λ4 is optically coupled between the fiber collimators 121 and 125 via the wavelength filters 126, 129, and 130 and the mirrors 132 and 133.

  Since the optical multiplexer / demultiplexer shown in FIG. 6 is an example in which the number of wavelength multiplexed signals is four, the dielectric multilayer wavelength selection filters required in this case are five wavelength filters 126 to 130, The total reflection mirrors required are three mirrors 131 to 133.

  Next, the operation of the optical multiplexer / demultiplexer will be described. First, the operation when demultiplexing will be described, and the operation when multiplexing will be described later.

  In the case of demultiplexing, an optical signal of the wavelength group (λ1 to λ4) enters the housing 120 as an incident optical signal from the fiber collimator 121. This incident optical signal enters the wavelength filter 126. Of the optical signals of the wavelength group (λ1 to λ4) incident on the wavelength filter 126, the optical signal having the first wavelength λ1 and the second wavelength λ2 is transmitted through the wavelength filter 126, and the third wavelength λ3 and the second wavelength λ3. The optical signal having the wavelength λ 4 of 4 is reflected by the wavelength filter 126. That is, the optical signals of the wavelength group (λ1 to λ4) are divided (separated) into two groups by the wavelength filter 126.

  The optical signal having the first wavelength λ 1 and the second wavelength λ 2 that has passed through the wavelength filter 126 is incident on the wavelength filter 127. The wavelength filter 127 is designed and manufactured to transmit an optical signal having the first wavelength λ1 and reflect an optical signal having the second wavelength λ2 among the incident optical signals. Then, the fiber collimators 121 and 122 and the wavelength filters 126 and 127 are aligned and fixed so that the optical signal having the first wavelength λ1 transmitted through the wavelength filter 127 is coupled to the fiber collimator 122.

  On the other hand, the optical signal having the second wavelength λ <b> 2 reflected by the wavelength filter 127 is reflected by the mirror 131 so as to be folded, and further passes through the wavelength filter 128. The fiber collimator 123, the mirror 131, and the wavelength filter 128 are aligned and fixed so that the optical signal having the second wavelength λ2 transmitted through the wavelength filter 128 is coupled to the fiber collimator 123. Here, the optical signal having the second wavelength λ <b> 2 is not the fiber collimator 124 but the fiber collimator 123.

  Subsequently, the operation of the optical signal having the third wavelength λ3 and the fourth wavelength λ4 reflected by the wavelength filter 126 will be described.

  The optical signal having the third wavelength λ 3 and the fourth wavelength λ 4 is turned back by the mirror 132 and enters the wavelength filter 129. The wavelength filter 129 is designed and manufactured so as to transmit an optical signal having the third wavelength λ3 and reflect an optical signal having the fourth wavelength λ4 among the incident optical signals. Then, the mirror 132, the wavelength filter 129, and the fiber collimator 124 are aligned and fixed so that the optical signal having the third wavelength λ3 transmitted through the wavelength filter 129 is coupled to the fiber collimator 124.

  On the other hand, the optical signal having the fourth wavelength λ 4 reflected by the wavelength filter 129 is folded by the mirror 133 and transmitted through the wavelength filter 130. The mirror 133, the wavelength filter 130, and the fiber collimator 125 are aligned and fixed so that the optical signal having the fourth wavelength λ4 transmitted through the wavelength filter 130 is coupled to the fiber collimator 125.

  Next, the operation when multiplexing is described. There is no problem if alignment has already been performed, but if alignment has not been performed, alignment may be performed in a manner opposite to that in the case of demultiplexing.

  More specifically, an optical signal having the second wavelength λ 2 incident on the housing 120 from the fiber collimator 123 is transmitted through the wavelength filter 128 and reflected by the mirror 131, and then folded back by the wavelength filter 127. Reflect on.

  On the other hand, the optical signal having the first wavelength λ 1 incident on the housing 120 from the fiber collimator 122 passes through the wavelength filter 127. At this time, the optical signal having the first wavelength λ1 transmitted through the wavelength filter 127 and the optical signal having the second wavelength λ2 reflected by the wavelength filter 127 are in a state where their optical axes coincide with each other. The light enters the wavelength filter 126. The optical signals having the first wavelength λ 1 and the second wavelength λ 2 incident on the wavelength filter 126 are transmitted through the wavelength filter 126 and optically coupled to the fiber collimator 121.

  The fiber collimators 122 and 123 are arranged substantially in parallel, but may not be completely parallel for the following reasons. That is, it is necessary to make some adjustments depending on the incident / exit angles of the fiber collimators 121 to 123, the fabrication accuracy of the wavelength filters 126 to 128 and the mirror 131, the mounting accuracy of each component on the housing 120, and the like. Nevertheless, the fiber collimators 122 and 123 can be arranged substantially in parallel.

  Further, the optical signal having the fourth wavelength λ 4 that enters the housing 120 from the fiber collimator 125 passes through the wavelength filter 130, is folded by the mirror 131, and is folded by the wavelength filter 129. The optical signal having the third wavelength λ 3 that enters the housing 120 from the fiber collimator 124 passes through the wavelength filter 129. The optical signal having the third wavelength λ3 transmitted through the wavelength filter 129 and the optical signal having the fourth wavelength λ4 reflected by the wavelength filter 129 are directed to the mirror 132 in a state where their optical axes coincide with each other. It emits toward. In other words, so that the optical axis of the optical signal having the third wavelength λ3 transmitted through the wavelength filter 129 and the optical axis of the optical signal having the fourth wavelength λ4 reflected by the wavelength filter 129 coincide with each other. Each optical component is aligned and fixed.

  Thus, the optical signal having the third wavelength λ3 and the fourth wavelength λ4 whose optical axes coincide with each other is folded by the mirror 132 and also folded by the wavelength filter 126 and transmitted through the wavelength filter 127. The mirror 132 is aligned so that optical signals having the third wavelength λ3 and the fourth wavelength λ4 that pass through the wavelength filter 127 are optically coupled to the fiber collimator 121.

  Of course, the fiber collimators 124 and 125 are also arranged substantially parallel to the fiber collimators 122 and 123.

  The inventors selected the center wavelengths of the optical signals having the first to fourth wavelengths (λ1 to λ4) to be used as 1.49 μm, 1.51 μm, 1.53 μm, and 1.55 μm, respectively. As a result, it was confirmed that the insertion loss was 0.7 dB or less and the isolation was 30 dB or more, and a good result was obtained. Of course, the wavelength to be selected is not limited to the above-mentioned value, and any wavelength can be selected as long as it satisfies the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band. is there.

  Next, a specific manufacturing method of the optical multiplexer / demultiplexer according to the sixth embodiment will be described. First, a holder for holding the fiber collimators 121 to 125 is processed on the stainless steel casing 120. Next, markings for roughly positioning the wavelength filters 126 to 130 and the mirrors 131 to 133 using dielectric multilayer films built in the casing 120 are applied to the casing 120.

  Prior to the active alignment operation, the wavelength filter 126 and the mirror 131 are positioned and temporarily fixed to the housing 120 by a handling jig interlocked with a micrometer according to the above-described marking. The wavelength filter 126 transmits an optical signal having a wavelength range of 1.49 μm to 1.51 μm and reflects an optical signal having a wavelength range of 1.53 μm to 1.55 μm. The mirror 131 reflects an optical signal having a wavelength of 1.51 μm.

  Next, an alignment operation for optically coupling the optical signal having a wavelength of 1.49 μm emitted from the fiber collimator 121 to the fiber collimator 122 through the wavelength filters 126 and 127 is performed. That is, an optical signal having a predetermined wavelength is made incident on the casing 120, and the fiber collimator 122 and the wavelength filters 126 to 129 are finely adjusted, thereby performing alignment so as to maximize the coupling efficiency.

  The alignment work here was less than 5 minutes. Nevertheless, it was confirmed that the coupling loss including the fiber collimators 121 and 122 was considerably less than 1 dB. Thereafter, the fiber collimators 121 and 122 are firmly fixed to the casing 120 by metal solder, and the wavelength filters 126 and 127 are firmly fixed by the ultraviolet curable optical adhesive. It was confirmed that there was almost no increase in loss due to this fixing work.

  Next, an optical signal having a wavelength of 1.51 μm is incident on the housing 120 from the fiber collimator 121 and reflected by the second wavelength filter 127. The optical signal having a wavelength of 1.51 μm reflected by the wavelength filter 127 is folded back by the mirror 131 made of a dielectric multilayer film, passes through the wavelength filter 128, and enters the fiber collimator 123. In order to increase the coupling efficiency, the mirror 131, the wavelength filter 128, and the fiber collimator 123 are finely adjusted with a micrometer. The fixing method to the housing 120 here is performed using metal solder for the fiber collimator 123 and an optical adhesive for the mirror 131 and the wavelength filter 128 as in the case described above. At this time, the casing 120 and the fiber collimator 122 are firmly held by the holding jig so that the misalignment of the fiber collimator 122 does not occur.

  The fiber collimators 124 and 125, the wavelength filters 129 and 130, and the mirrors 132 and 133 are aligned / fixed by the same method. Through the above operations, the optical multiplexer / demultiplexer according to the present invention can be manufactured.

  A preferable first feature of the optical multiplexer / demultiplexer according to the sixth embodiment is that an input / output port can be disposed on a preferable end face of the housing 120. This is because a dielectric multilayer filter that acts as a total reflection mirror is used for an optical signal having a plurality of specific wavelengths. The second feature is that the number of parts can be reduced and the parts can be miniaturized. The reason why the number of parts can be reduced is that a structure for coupling light spatially is adopted, and the number of fiber collimators can be reduced. The reason why the size of the component can be reduced is that it is not necessary to provide a space for storing the extra length of the fiber in the housing.

  In the optical multiplexer / demultiplexer according to the sixth embodiment, the light beam is divided into two groups, and the two groups can be independently aligned / controlled. Therefore, for example, as will be described later, when a laser diode or a phototransistor is directly installed at the input / output port, it is possible to easily perform alignment / assembly work taking into account the tolerance of alignment. Furthermore, since it can manufacture with the alignment precision and assembly procedure according to each group, an assembly operation can be facilitated. For example, it is assumed that laser diodes and photodiodes are alternately installed at the input / output ports. In this case, the operation of installing / aligning the plurality of laser diodes can be performed independently of the operation of installing / aligning the plurality of photodiodes. In general, since the operation of installing / aligning the photodiode is easier than that of the laser diode, the installation / alignment time can be shortened as compared with the case where the light beam is not divided into two groups.

  When only the multiplexing function is required or when high isolation is not required, one or both of the wavelength filters 128 and 130 can be omitted.

  In the embodiment 6, the case of an optical multiplexer / demultiplexer corresponding to four wavelengths has been described as an example. However, the optical multiplexer / demultiplexer of the present invention is not limited to this, and is a combination of a wavelength filter and a mirror. In principle, it corresponds to other numbers of wavelengths (indicating that multiplexing is possible for the number of wavelengths) such as 3 wavelengths, 5 wavelengths, 6 wavelengths, 8 wavelengths, 16 wavelengths, and even 32 wavelengths. It can also be applied to configurations.

  Next, a configuration of a general case of an optical multiplexer / demultiplexer for P (P is an integer of 3 or more) wavelength will be described.

  The P wavelength compatible optical multiplexer / demultiplexer is for multiplexing / demultiplexing optical signals having a wavelength group consisting of a first wavelength to a Pth wavelength (λ1 to λP) different from each other. The optical multiplexer / demultiplexer includes a housing having a first side surface and a second side surface facing each other, a first input / output port disposed on the first side surface of the housing, and a second side of the housing. A second input / output port to a (P + 1) th input / output port arranged on the side surface. The first entrance / exit port is for entering / exiting an optical signal having the above wavelength group to / from the housing. The second input / output port through the (P + 1) th input / output port are used to input / output optical signals having the first through Pth wavelengths (λ1 to λP), respectively. The housing includes first to Pth light transmission means.

  The p-th (p is a positive integer less than or equal to P) optical transmission means transmits the optical signal having the p-th wavelength (λp) incident from the first input / output port to the (p + 1) -th input / output port. Then, an optical signal having the p-th wavelength (λp) incident from the (p + 1) -th input / output port is transmitted toward the first input-output port.

  By the way, in the form according to the sixth embodiment, the case where the light input / output port is a fiber collimator has been described as an example. However, if only multiplexing is performed, a lens and a laser are used instead of the fiber collimators 122 to 125. It is also possible to use an LD module composed of a combination of diodes (LD). In this case, the optical multiplexer / demultiplexer can be used as an optical multiplexer. Furthermore, if only demultiplexing is performed, it is possible to use a PD module comprising a combination of a lens and a photodiode (PD) instead of the fiber collimators 122 to 125. In this case, the optical multiplexer / demultiplexer can be used as an optical demultiplexer. In addition, in the form according to the sixth embodiment, the three mirrors 131 to 133 can be integrated into a single mirror.

  FIG. 7 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 7 of the present invention. The basic structure of the optical multiplexer / demultiplexer according to the seventh embodiment is the same as that of the optical multiplexer / demultiplexer according to the sixth embodiment.

  More specifically, the optical multiplexer / demultiplexer according to the seventh embodiment includes a housing 148 having a first side surface (right side surface in the drawing) and a second side surface (left side surface in the drawing) facing each other. A fiber collimator 138 as a first input / output port is disposed on the first side surface of the housing 148. Fiber collimators 139 to 142 as second input / output ports to fifth input / output ports are arranged on the second side surface of the casing 148.

  The fiber collimator 138 (first input / output port) is for inputting / exiting an optical signal having a wavelength group composed of different first wavelength to fourth wavelength λ1 to λ4 to / from the housing 148. . The fiber collimators 139 to 142 (second input / output ports to 5 input / output ports) are used to input and output optical signals having first to fourth wavelengths λ1 to λ4, respectively. The housing 148 includes first to fourth light transmission means described below.

  The first light transmission means transmits the optical signal having the first wavelength λ1 incident from the fiber collimator 138 (first input / output port) toward the fiber collimator 139 (second input / output port), and An optical signal having the first wavelength λ1 incident from the fiber collimator 139 (second input / output port) is transmitted toward the fiber collimator 138 (first input / output port).

  The second light transmission means transmits the optical signal having the second wavelength λ2 incident from the fiber collimator 138 (first input / output port) toward the fiber collimator 140 (third input / output port), and An optical signal having the second wavelength λ2 incident from the fiber collimator 140 (third input / output port) is transmitted toward the fiber collimator 138 (first input / output port).

  The third light transmission means transmits the optical signal having the third wavelength λ3 incident from the fiber collimator 138 (first input / output port) toward the fiber collimator 141 (fourth input / output port), and An optical signal having a third wavelength λ3 incident from the fiber collimator 141 (fourth input / output port) is transmitted toward the fiber collimator 138 (first input / output port).

  The fourth light transmission means transmits the optical signal having the fourth wavelength λ4 incident from the fiber collimator 138 (first input / output port) toward the fiber collimator 142 (fifth input / output port), and An optical signal having a fourth wavelength λ4 incident from the fiber collimator 142 (fifth input / output port) is transmitted toward the fiber collimator 138 (first input / output port).

  As will be described below, the optical multiplexer / demultiplexer according to the seventh embodiment of the present invention differs from the optical multiplexer / demultiplexer according to the sixth embodiment in the configuration of the first optical transmission unit to the fourth optical transmission unit. .

  More specifically, the first light transmission means is composed of a wavelength filter 143 disposed in the vicinity of the fiber collimator 139, the wavelength filter 143 transmits only an optical signal having the first wavelength λ1, and The optical signal having the second wavelength to the fourth wavelength λ2 to λ4 is reflected.

  The second light transmission means includes all of the wavelength filter 143 described above, the wavelength filter 144 arranged in the vicinity of the fiber collimator 140, and the first reflecting means arranged on the first side surface side of the housing 148. And a reflection mirror 147. The wavelength filter 144 transmits only the optical signal having the second wavelength λ2, and reflects the optical signal having the third wavelength λ3 and the fourth wavelength λ4. The mirror 147 reflects the optical signal having the second to fourth wavelengths λ <b> 2 to λ <b> 4 reflected by the wavelength filter 143 toward the wavelength filter 144, and is incident from the fiber collimator 140 and passes through the wavelength filter 144. The optical signal having the second wavelength λ 2 is reflected toward the wavelength filter 143.

  The third light transmission means includes the above-described wavelength filters 143 and 144, the wavelength filter 145 disposed in the vicinity of the fiber collimator 141, and the second reflection means disposed on the first side surface inside the housing 148. As a total reflection mirror 147. The wavelength filter 145 transmits only the optical signal having the third wavelength λ3 and reflects the optical signal having the fourth wavelength λ4. The mirror 147 reflects the optical signal having the third wavelength λ 3 and the fourth wavelength λ 4 reflected by the wavelength filter 144 toward the wavelength filter 145, enters from the fiber collimator 141, and passes through the wavelength filter 145. The optical signal having the third wavelength λ 3 is reflected toward the wavelength filter 144.

  The fourth light transmission means includes the above-described wavelength filters 143, 144, 145, the wavelength filter 146 disposed in the vicinity of the fiber collimator 142, and the third side disposed in the first side surface in the housing 148. It comprises a total reflection mirror 147 as reflection means. The wavelength filter 146 transmits only the optical signal having the fourth wavelength λ4. The mirror 147 reflects the optical signal having the fourth wavelength λ 4 reflected by the wavelength filter 145 toward the wavelength filter 146, and enters the fiber collimator 142 and transmits the wavelength filter 146. The optical signal is reflected toward the wavelength filter 145.

  In the example shown in FIG. 7, the mirror 147 as the first to third reflecting means is composed of a single mirror. However, it goes without saying that there is no problem even if the mirror 147 is divided into two or three.

  The fiber collimators 138 and 139 are arranged on a substantially straight line so that the first optical axes of the incoming and outgoing light beams are substantially coincident with each other, and the wavelength filter 143 is arranged at a predetermined angle on the first optical axis. Has been placed.

  The mirror 147 is arranged so that the second to fourth optical axes of the light rays entering and exiting the fiber collimators 140 to 142 are substantially parallel to the first optical axis of the light rays from the fiber collimator 138 to the fiber collimator 139. They are arranged at a predetermined angle and at a predetermined position with respect to the second optical axis to the fourth optical axis.

  The wavelength filters 144 to 146 are respectively disposed at predetermined angles with respect to the second optical axis to the fourth optical axis. The optical signal having the first wavelength λ1 is optically coupled via the wavelength filter 143 between the fiber collimators 138 and 139. The optical signal having the second wavelength λ 2 is optically coupled between the fiber collimators 138 and 140 via the wavelength filters 143 and 144 and the mirror 147. The optical signal having the third wavelength λ3 is optically coupled between the fiber collimators 138 and 141 via the wavelength filters 143 and 145 and the mirror 147. The optical signal having the fourth wavelength λ4 is optically coupled between the fiber collimators 138 and 142 via the wavelength filters 143 to 146 and the mirror 147.

  In the configuration of the optical multiplexer / demultiplexer according to the seventh embodiment shown in FIG. 7, the number of repetitive reflections increases with respect to the optical signal having the fourth wavelength λ4. Instead, the wavelength filter shown in FIG. 126 can be omitted.

  Needless to say, the optical multiplexer / demultiplexer of the present invention is not limited to the embodiments described in the sixth and seventh embodiments, and various modifications can be made without departing from the technical scope of the present invention. For example, the applicable range of the present invention extends not only to an optical multiplexer / demultiplexer that uses multiple wave multiplexing of 6 waves or more, for example, 8 waves or 16 waves or more, but also high density wavelength multiplexing with a very narrow wavelength interval. The present invention is also applicable to (DWDM) optical multiplexer / demultiplexers. However, multiplexing of 6 waves or more can be dealt with by simply increasing the number of wavelength filters, or by combining a plurality of 2-wave and 4-wave multiplexing configurations. The optical multiplexer / demultiplexer for high-density wavelength multiplexing can be further easily handled by appropriately combining wavelength filters having dielectric multilayer films.

  FIG. 8 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 8 of the present invention. The optical multiplexer / demultiplexer according to the eighth embodiment includes a housing having a first side surface (left side surface in the drawing) and a second side surface (right side surface in the drawing) facing each other.

  A fiber collimator 151 serving as a first input / output port and a fiber collimator 152 serving as a second input / output port are disposed on the first side surface of the housing, and a third input / output port is disposed on the second side surface. Fiber collimators 153 to 156 are arranged as exit ports to sixth entrance / exit ports. Each input / output port may be referred to as an optical signal input / output unit, and is configured by a fiber collimator including an optical fiber and a lens. In particular, a two-core collimator is used for the fiber collimators 151 and 152 shown in FIG. Incidentally, the optical fiber and the lens constituting the optical signal input / output means are arranged at a position where the optical signal becomes collimated light.

  The fiber collimator 151 (first input / output port) includes an optical signal having a first wavelength group composed of a first wavelength to a fourth wavelength λ1 to λ4 that are different from each other, and a fifth wavelength that is the other wavelength. Or an optical signal having a second wavelength group consisting of (m + 3) th wavelengths λ5,..., Λm to λm + 3. The fiber collimator 152 (second input / output port) is for inputting / exiting the optical signal of the second wavelength group to / from the housing. The fiber collimators 153 to 156 (third input / output ports to sixth input / output ports) are for inputting and outputting optical signals having first to fourth wavelengths λ1 to λ4, respectively.

  The casing includes transmission / reflection means 157 and first to fourth light transmission means as described below.

  The transmission / reflection unit 157 is disposed in the vicinity of the fiber collimators 151 and 152, transmits an optical signal having the first wavelength group among the optical signals incident from the fiber collimator 151, and transmits the second wavelength group. Is reflected toward the fiber collimator 152, the optical signal having the second wavelength group incident from the fiber collimator 152 is reflected, and the optical signal having the reflected second wavelength group is reflected in the housing. Are combined with an optical signal having the first wavelength group incident from the second side surface, and output to the fiber collimator 151. In the case of the example shown in FIG. 8, the transmission / reflection unit 157 includes a wavelength selection filter (hereinafter simply referred to as “wavelength filter”) using a dielectric multilayer film.

  The first light transmission means transmits the optical signal having the first wavelength λ1 incident from the fiber collimator 151 via the wavelength filter 157 to the fiber collimator 153 and also receives the first wavelength incident from the fiber collimator 153. An optical signal having λ1 is transmitted to the fiber collimator 151 through the wavelength filter 157.

  The second light transmission means transmits the optical signal having the second wavelength λ2 incident from the fiber collimator 151 via the wavelength filter 157 to the fiber collimator 154 and the second wavelength incident from the fiber collimator 154. An optical signal having λ 2 is transmitted to the fiber collimator 151 through the wavelength filter 157.

  The third light transmission means transmits the optical signal having the third wavelength λ3 incident from the fiber collimator 151 via the wavelength filter 157 toward the fiber collimator 155 and the third wavelength incident from the fiber collimator 155. An optical signal having λ 3 is transmitted to the fiber collimator 151 through the wavelength filter 157.

  The fourth light transmission means transmits the optical signal having the fourth wavelength λ4 incident from the fiber collimator 151 via the wavelength filter 157 toward the fiber collimator 156 and the fourth wavelength incident from the fiber collimator 156. An optical signal having λ4 is transmitted to the fiber collimator 151 through the wavelength filter 157.

  In the example shown in FIG. 8, the first light transmission means includes a first wavelength filter 158 and a second wavelength filter 159. The first wavelength filter 158 is disposed between the wavelength filter 157 and the second side surface of the housing, transmits an optical signal having the first wavelength λ1 and the second wavelength λ2, and is third. The optical signal having the wavelength λ3 and the fourth wavelength λ4 is reflected. The second wavelength filter 159 is disposed between the first wavelength filter 158 and the second side surface of the housing in the vicinity of the fiber collimator 153, and transmits an optical signal having the first wavelength λ1. The optical signal having the second wavelength λ2 is reflected.

  The second light transmission means includes the above-described wavelength filters 158 and 159, the third wavelength filter 160, and the total reflection mirror 163 as the first reflection means. The third wavelength filter 160 is disposed in the vicinity of the fiber collimator 154 and transmits only an optical signal having the second wavelength λ2. The total reflection mirror 163 reflects the optical signal having the second wavelength λ2 reflected by the second wavelength filter 159 toward the third wavelength filter 160 and is incident on the first light from the fiber collimator 154 into the housing. The optical signal having the second wavelength λ <b> 2 that has passed through the third wavelength filter 160 is reflected toward the second wavelength filter 159. In the example shown in FIG. 8, the first reflecting means is constituted by a total reflection mirror 163. Hereinafter, the total reflection mirror is also simply referred to as a mirror.

  The third light transmission means includes the first wavelength filter 158, the fourth wavelength filter 161, and the second total reflection mirror 164 as the second reflection means.

  The fourth wavelength filter 161 is disposed in the vicinity of the fiber collimator 155, transmits an optical signal having the third wavelength λ3, and reflects an optical signal having the fourth wavelength λ4. The second mirror 164 is arranged on the first side surface side of the housing, and transmits the optical signal having the third wavelength λ3 and the fourth wavelength λ4 reflected by the first wavelength filter 158 to the fourth wavelength. An optical signal having the third wavelength λ3 reflected toward the wavelength filter 161 and further transmitted through the fourth wavelength filter 161 and an optical signal having the fourth wavelength λ4 reflected by the fourth wavelength filter 161 Reflected toward the first wavelength filter 158.

  The fourth transmission means includes the first wavelength filter 158 and the fourth wavelength filter 161 described above, the fifth wavelength filter 162, and the third total reflection mirror 165 as the third reflection means. Yes. The fifth wavelength filter 162 is disposed in the vicinity of the fiber collimator 156 and transmits only an optical signal having the fourth wavelength. The third mirror 165 reflects the optical signal having the fourth wavelength λ4 reflected by the fourth wavelength filter 161 toward the fifth wavelength filter 162, and further enters the housing from the fiber collimator 156. The optical signal having the fourth wavelength λ 4 that has passed through the fifth wavelength filter 162 is reflected toward the fourth wavelength filter 161.

  However, here, the fiber collimators 151 and 152 and the fiber collimator 153 are arranged on a substantially straight line so that the first optical axes of the light rays entering and exiting each other are substantially coincident with each other. In addition, the wavelength filter 157 and the wavelength filters 158 and 159 are arranged at predetermined angles, respectively.

  The second to fourth optical axes of the light beams entering and exiting the fiber collimators 154, 155, and 156 are substantially parallel to the first optical axis of the light beams from the fiber collimators 151 and 152 to the fiber collimator 153. The mirrors 163, 164, and 165 are respectively disposed at predetermined angles with respect to the second to fourth optical axes.

  The optical signal having the first wavelength λ1 is optically coupled between the fiber collimators 151 and 153 via the wavelength filter 157 and the wavelength filters 158 and 159. The optical signal having the second wavelength λ <b> 2 is optically coupled between the fiber collimators 151 and 154 via the wavelength filter 157, the wavelength filters 158, 159 and 160, and the mirror 163. The optical signal having the third wavelength λ3 is optically coupled between the fiber collimators 151 and 155 via the wavelength filter 157, the wavelength filters 158 and 161, and the mirror 164. The optical signal having the fourth wavelength λ4 is optically coupled between the fiber collimators 151 and 156 via the wavelength filter 157, the wavelength filters 158, 161 and 162, and the mirrors 164 and 165. Optical signals having wavelengths other than the first to fourth wavelengths λ1 to λ4 are optically coupled between the fiber collimators 151 and 152 via the wavelength filter 157.

  The optical multiplexer / demultiplexer shown in FIG. 8 shows a case where the number of wavelength multiplexed signals is four. In this case, the required wavelength filter by the dielectric multilayer film is five by the wavelength filters 158 to 162 except for one wavelength filter 157 that reflects other wavelength ranges, and the required total reflection mirror is The number of mirrors 163 to 165 is three.

  Next, the operation of the optical multiplexer / demultiplexer according to the eighth embodiment will be described. First, the operation when demultiplexing will be described, and the operation when multiplexing will be described later.

  In the case of demultiplexing, the optical signal of the first wavelength group and the optical signal of the second wavelength group are incident on the housing as incident optical signals from the fiber collimator 151. The wavelength filter 157 selectively transmits the optical signals of the first wavelength group λ1 to λ4 among the incident optical signals and enters the wavelength filter 158. Therefore, the wavelength filter 157 reflects and emits the second wavelength group λ5 to (λm + 3) of the incident optical signal toward the fiber collimator 152.

  In the example shown in FIG. 8, the fiber collimators 151 and 152 are configured by two-core collimators, but these may be configured by separate one-core collimators. However, compared to the case where the fiber collimators 151 and 152 are configured by separate single-core collimators, the one configured by the two-core collimator can reduce one lens and one ferrule, From the viewpoint of reducing the number of parts, a two-core collimator is more advantageous.

  Of the optical signals of the first wavelength group λ1 to λ4 incident on the wavelength filter 158, the optical signal having the first wavelength λ1 and the second wavelength λ2 is transmitted through the wavelength filter 158, and the third wavelength λ3 and the second wavelength λ3. An optical signal having a wavelength λ 4 of 4 is reflected by the wavelength filter 158. That is, the optical signals of the first wavelength group λ1 to λ4 are divided (separated) into two groups by the wavelength filter 158.

  The optical signal having the first wavelength λ 1 and the second wavelength λ 2 that has passed through the wavelength filter 158 enters the wavelength filter 159. The wavelength filter 159 is designed and manufactured to transmit an optical signal having the first wavelength λ1 of the incident optical signal and reflect an optical signal having the second wavelength λ2. Then, the fiber collimators 151 to 153, the wavelength filter 157, and the wavelength filters 158 and 159 are aligned / fixed so that the optical signal having the first wavelength λ1 transmitted through the wavelength filter 159 is coupled to the fiber collimator 153. .

  The optical signal having the second wavelength λ 2 reflected by the wavelength filter 159 is reflected by the mirror 163 so as to be reflected, and further passes through the wavelength filter 160. The fiber collimator 154, the mirror 163, and the wavelength filter 160 are aligned / fixed so that the optical signal having the second wavelength λ2 transmitted through the wavelength filter 160 is coupled to the fiber collimator 154. Here, the optical signal having the second wavelength λ <b> 2 is characterized in that the optical collimator is not the fiber collimator 155 but the fiber collimator 154.

  Subsequently, the operation of the optical signal having the third wavelength λ3 and the fourth wavelength λ4 reflected by the wavelength filter 158 will be described.

  The optical signal having the third wavelength λ 3 and the fourth wavelength λ 4 is turned back by the mirror 164 and enters the wavelength filter 161. The wavelength filter 161 is designed and manufactured to transmit an optical signal having the third wavelength λ3 and reflect an optical signal having the fourth wavelength λ4 among the incident optical signals. Then, the mirror 164, the wavelength filter 161, and the fiber collimator 155 are aligned and fixed so that the optical signal having the third wavelength λ3 that has passed through the wavelength filter 161 is coupled to the fiber collimator 155. Further, the optical signal having the fourth wavelength λ 4 reflected by the wavelength filter 161 is folded by the mirror 165 and passes through the wavelength filter 162. The mirror 165, the wavelength filter 162, and the fiber collimator 156 are aligned and fixed so that the optical signal having the fourth wavelength λ4 that has passed through the wavelength filter 162 is coupled to the fiber collimator 156.

  Next, the operation when multiplexing is described. There is no problem if alignment has already been performed, but if alignment has not been performed, alignment may be performed in a manner opposite to that of demultiplexing.

  Specifically, an optical signal having the second wavelength λ 2 incident on the housing from the fiber collimator 154 is transmitted through the wavelength filter 160, reflected by the mirror 163, and then folded by the wavelength filter 159. Reflect on.

  The optical signal having the first wavelength λ1 incident on the housing from the fiber collimator 153 passes through the wavelength filter 159. At this time, the optical signal having the first wavelength λ1 that passes through the wavelength filter 159 The optical signal having the second wavelength λ 2 reflected by the wavelength filter 159 enters the wavelength filter 158 in a state where their optical axes coincide with each other. The optical signals having the first wavelength λ 1 and the second wavelength λ 2 incident on the wavelength filter 158 are transmitted through the wavelength filter 158 and further transmitted through the wavelength filter 157 and coupled to the fiber collimator 151.

  The fiber collimators 153 and 154 are arranged substantially in parallel, but may not be completely parallel for the reason described below. That is, for these factors, it is necessary to make some adjustments depending on the incident / exit angles of the fiber collimators 151 to 154, the accuracy of manufacturing the wavelength filter 157, the wavelength filters 158 to 160, and the mirror 163, the mounting accuracy of each component on the housing, and the like. It is mentioned that there is. Nevertheless, the fiber collimators 153 and 154 can be arranged substantially in parallel.

  On the other hand, the optical signal having the fourth wavelength λ 4 incident on the housing from the fiber collimator 156 passes through the wavelength filter 162, is folded back by the mirror 165, and is further folded by the wavelength filter 161. The optical signal having the third wavelength λ 3 incident on the housing from the fiber collimator 155 passes through the wavelength filter 161. The optical signal having the third wavelength λ3 transmitted through the wavelength filter 161 and the optical signal having the fourth wavelength λ4 reflected by the wavelength filter 161 are directed toward the mirror 164 in a state where their optical axes coincide with each other. And exit. In other words, the optical axis of the optical signal having the third wavelength λ3 transmitted through the wavelength filter 161 and the optical axis of the optical signal having the fourth wavelength λ4 reflected by the wavelength filter 161 are matched. The optical element is aligned and fixed.

  Thus, the optical signal having the third wavelength λ3 and the fourth wavelength λ4 whose optical axes coincide with each other is folded by the mirror 164 and further folded by the wavelength filter 158 and transmitted through the wavelength filter 157. The mirror 164 is aligned so that optical signals having the third wavelength λ3 and the fourth wavelength λ4 that pass through the wavelength filter 157 are optically coupled to the fiber collimator 151.

  Of course, the fiber collimators 155 and 156 are also arranged substantially parallel to the fiber collimators 153 and 154.

  The inventors have selected the center wavelengths of the optical signals having the first to fourth wavelengths λ1 to λ4 to be 1.49 μm, 1.51 μm, 1.53 μm, and 1.55 μm, respectively. It was confirmed that the insertion loss was 0.7 dB or less, the isolation was 30 dB or more, and good results were obtained. However, the wavelength to be selected is not limited to the value described above, and can be arbitrarily selected as long as it satisfies the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band.

  Hereinafter, a specific method for manufacturing the optical multiplexer / demultiplexer according to the eighth embodiment will be described. First, a holding portion for holding the fiber collimators 151 to 156 is processed on a stainless steel casing. Next, markings are provided on the casing for approximate positioning of the wavelength filters 157 to 162 and the mirrors 163 to 165 using dielectric multilayer films built in the casing.

  The wavelength filter 157 is an optical signal other than the optical signal having the first wavelength group consisting of the first wavelength to the fourth wavelength with respect to the fiber collimators 151 and 152 (or the two-core collimator) in advance (that is, the second wavelength collimator). An optical signal having a wavelength group) is aligned so as to be optically coupled to the fiber collimator 152. After this alignment, the wavelength filter 157 is fixed to the housing together with the fiber collimators 151 and 152.

  Prior to the active alignment operation, the wavelength filter 158 and the mirror 163 are positioned and temporarily fixed to the housing by a handling jig interlocked with the micrometer in accordance with the marking described above. The wavelength filter 158 transmits an optical signal having a wavelength of 1.49 μm to 1.51 μm and reflects an optical signal having a wavelength of 1.53 μm to 1.55 μm. The mirror 163 reflects an optical signal having a wavelength of 1.51 μm.

  Next, an alignment operation for optically coupling the optical signal having a wavelength of 1.49 μm emitted from the fiber collimator 151 to the fiber collimator 153 through the wavelength filter 157 and the wavelength filters 158 and 159 is performed. In other words, the optical collimator 153 and the wavelength filters 158 and 159 are finely adjusted by causing an optical signal having a predetermined wavelength to enter the housing, thereby performing alignment so that the coupling efficiency is maximized.

  The alignment work here was less than 5 minutes. Nevertheless, it was confirmed that the coupling loss including the fiber collimator was well below 1 dB. Thereafter, the fiber collimators 151 to 153 are firmly fixed to the casing with metal solder, and the wavelength filters 157 to 159 are firmly fixed to the casing with an ultraviolet curable optical adhesive. It was confirmed that there was almost no increase in loss due to this fixing work.

  Further, an optical signal having a wavelength of 1.51 μm is incident on the housing from the fiber collimator 151 and reflected by the wavelength filter 159. The optical signal having a wavelength of 1.51 μm reflected by the wavelength filter 159 is folded by the mirror 163, passes through the wavelength filter 160, and enters the fiber collimator 154. In order to increase the coupling efficiency, the mirror 163, the wavelength filter 160, and the fiber collimator 154 are finely adjusted with a micrometer. The fixing method to the housing here is performed using metal solder for the fiber collimator 154 and an optical adhesive for the mirror 163 and the wavelength filter 160 as in the case described above. At this time, the housing and the fiber collimator 153 are firmly held by the holding jig so that the misalignment of the fiber collimator 153 does not occur.

  The fiber collimators 155 and 156, the wavelength filters 161 and 162, and the mirrors 164 and 165 are aligned and fixed by the same method. Through the above operation, the optical multiplexer / demultiplexer according to the eighth embodiment can be manufactured.

  A preferable first feature of the optical multiplexer / demultiplexer according to the eighth embodiment is that an input / output port can be disposed on a preferable end face of the casing. This is because a wavelength filter using a dielectric multilayer film that acts as a total reflection mirror for a plurality of specific wavelengths is used. The second feature is that the number of parts can be reduced and the parts can be miniaturized. The reason why the number of parts can be reduced is that a structure for coupling light spatially is adopted, and the number of fiber collimators can be reduced. The reason why the size of the component can be reduced is that it is not necessary to provide a space for storing the extra length of the fiber in the housing. The third feature is that an optical signal having another wavelength that does not perform multiplexing / demultiplexing for each wavelength can be guided to another optical path. This is because the fiber collimator 151 (first input / output port) is provided with a fiber collimator 152 (second input / output port), and a wavelength filter 147 is provided adjacent to the fiber collimator 152 (second input / output port).

  In the optical multiplexer / demultiplexer according to the eighth embodiment, when only the multiplexing function is required or when high isolation is not required, one or both of the wavelength filters 160 and 162 can be omitted. .

  Further, in the mode according to the eighth embodiment, the case where the light input / output port is a fiber collimator has been described as an example. However, if only multiplexing is performed, a lens and a laser diode are used instead of the fiber collimators 153 to 156. It is possible to use an LD module composed of a combination with (LD), and if only demultiplexing is performed, a PD module composed of a combination of a lens and a photodiode (PD) instead of the fiber collimators 155 to 156 It is also possible to use.

  Furthermore, in the form according to the eighth embodiment, the case where one optical multiplexer / demultiplexer corresponding to four wavelengths is configured is described as an example. However, the optical multiplexer / demultiplexer of the present invention is not limited to this. By combining wavelength filters and mirrors, in principle, other wavelengths such as 3 wavelengths, 5 wavelengths, 6 wavelengths, 8 wavelengths, 16 wavelengths and even 32 wavelengths can be multiplexed. It can also be applied to a configuration corresponding to the above.

  The configuration of the general case of the optical multiplexer / demultiplexer corresponding to the P (P is an integer of 3 or more) wavelength will be described below.

  The P wavelength compatible optical multiplexer / demultiplexer multiplexes / demultiplexes an optical signal having a first wavelength group consisting of a first wavelength to a Pth wavelength λ1 to λP different from each other, or This is for multiplexing / demultiplexing the optical signal having the first wavelength group from the other optical signals. The optical multiplexer / demultiplexer includes a casing having a first side surface and a second side surface facing each other, and a first input / output port and a second input / output port disposed on the first side surface of the casing. And a third input / output port to (P + 2) input / output port arranged on the second side surface. The first entrance / exit port is for entering / exiting an optical signal having the first wavelength group and an optical signal having the second wavelength group having other wavelengths to / from the housing. The second entrance / exit port is for entering / exiting the optical signal of the second wavelength group to / from the housing. The third input / output ports to (P + 2) input / output ports are used to input / output optical signals having the first to Pth wavelengths λ1 to λP, respectively.

  The housing includes transmission / reflection means disposed in the vicinity of the first input / output port and the second input / output port, and first to Pth light transmission means.

  The transmission / reflection means transmits the optical signal having the first wavelength group among the optical signals incident from the first input / output port, and transmits the optical signal having the second wavelength group to the second input / output port. Reflect towards The transmission / reflection means reflects the optical signal having the second wavelength group incident from the second input / output port, and further receives the reflected optical signal having the second wavelength group from the second side surface side. Are combined with an optical signal having the first wavelength group and output toward the first input / output port.

  The p-th (p is a positive integer less than or equal to P) light transmission means transmits the optical signal having the p-th wavelength λp incident from the first input / output port through the transmission / reflection means (p + 2) And the optical signal having the pth wavelength λp incident from the (p + 2) th input / output port is transmitted to the first input / output port through the transmission / reflection means. .

  FIG. 9 is a schematic diagram illustrating a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 9 of the present invention. The optical multiplexer / demultiplexer according to the ninth embodiment is an example in which a fiber collimator including a pigtail fiber and a lens is disposed as an optical signal input / output unit. The pigtail fiber and the lens are arranged at a position where the optical signal is collimated light in the housing. The example shown in FIG. 9 shows a case where the number of wavelength multiplexed signals to be multiplexed / demultiplexed one wavelength at a time is four. Aside from the wavelength filter 157 for entering and exiting the fiber collimator 152, the required number of wavelength filters using a dielectric multilayer film is five, and the number of required total reflection mirrors is also one.

  Referring to FIG. 9, when the optical multiplexer / demultiplexer according to the ninth embodiment is structurally compared with the optical multiplexer / demultiplexer according to the eighth embodiment illustrated in FIG. 8, the mirrors 163 to 165 are configured as one mirror. Since the parts are replaced with 166, the parts having the same functions as those shown in FIG.

  According to the optical multiplexer / demultiplexer according to the ninth embodiment, the required number of mirrors can be reduced by two compared to the eighth embodiment. However, it is necessary to devise the alignment method as much as the number of parts can be reduced. For this purpose, for example, the mirror alignment operation performed for each wavelength may be performed simultaneously for three wavelengths. . Alternatively, even if the mirror alignment operation is performed for one wavelength and two wavelengths, there is no problem in terms of performance. Of course, in this case, it is possible to adopt a configuration in which there are two mirrors.

  The inventors set the center wavelengths of the optical signals having the first to fourth wavelengths λ1 to λ4 entering and exiting the fiber collimators 153 to 156 to 1.27 μm, 1.29 μm, 1.31 μm, and 1. When 33 μm was selected, it was confirmed that the insertion loss was 0.7 dB or less and the isolation was 30 dB or more, and a good result was obtained. Of course, the wavelength to be selected is not limited to the above-mentioned value, and can be arbitrarily selected as long as it satisfies the propagation condition in the single mode from the 1.3 μm band to 1.6 μm.

  FIG. 10 is a schematic diagram illustrating a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 10 of the present invention. The optical multiplexer / demultiplexer according to the tenth embodiment has the same basic configuration as the optical multiplexer / demultiplexer according to the eighth embodiment shown in FIG.

  More specifically, the optical multiplexer / demultiplexer shown in FIG. 10 has a first side surface (side surface on the left side with respect to the paper surface) and a second side surface (side surface on the right side with respect to the paper surface) facing each other. Has a housing to hold.

  A fiber collimator 171 and a fiber collimator 172 as a first input / output port and a second input / output port are arranged on the first side surface of the housing, and the third input / output port through the second side surface. Fiber collimators 173 to 176 are disposed as sixth input / output ports.

  The fiber collimator 171 (first input / output port) includes an optical signal having a first wavelength group consisting of different first to fourth wavelengths λ1 to λ4, and other wavelengths λ5,. The optical signal having the second wavelength group consisting of λm to (λm + 3) is input to and output from the housing. The fiber collimator 172 (second input / output port) is for inputting / exiting an optical signal of the second wavelength group to / from the housing. The fiber collimators 173 to 176 (third input / output port to sixth input / output port) are for inputting and outputting optical signals having the first to fourth wavelengths λ1 to λ4, respectively.

  The housing includes transmission / reflection means 177 and first to fourth light transmission means to be described later.

  The transmission / reflection unit 177 is disposed in the vicinity of the fiber collimators 171 and 172, transmits an optical signal having the first wavelength group among the optical signals incident from the fiber collimator 171, and transmits the second wavelength. The optical signal having the second wavelength group is reflected from the fiber collimator 172, the optical signal having the second wavelength group incident from the fiber collimator 172 is reflected, and the reflected optical signal having the second wavelength group is reflected in the housing. Are combined with the optical signal having the first wavelength group incident from the second side surface and reflected toward the fiber collimator 171. In the example shown in FIG. 10, the transmitting / reflecting means 177 is composed of a wavelength selection filter (wavelength filter) made of a dielectric multilayer film.

  The first light transmission means transmits the optical signal having the first wavelength λ1 incident from the fiber collimator 171 (first input / output port) through the transmission / reflection means 177 to the fiber collimator 173 (third input / output port). ) And further, an optical signal having the first wavelength λ1 incident from the fiber collimator 173 (third input / output port) is transmitted through the transmission / reflection means 177 to the fiber collimator 171 (first input / output port). )

  The second light transmission means transmits an optical signal having the second wavelength λ2 incident from the fiber collimator 171 (first input / output port) via the transmission / reflection means 177 to the fiber collimator 174 (fourth input / output port). ), And further, an optical signal having the second wavelength λ2 incident from the fiber collimator 174 (fourth input / output port) is transmitted through the transmission / reflection means 177 to the fiber collimator 171 (first input / output port). )

  The third light transmission means transmits the optical signal having the third wavelength λ3 incident from the fiber collimator 171 (first input / output port) via the transmission / reflection means 177 to the fiber collimator 175 (fifth input / output port). ) And further, an optical signal having a third wavelength λ3 incident from the fiber collimator 175 (fifth input / output port) is transmitted through the reflection / reflection means 177 to the fiber collimator 171 (first input / output port). )

  The fourth light transmission means transmits an optical signal having a fourth wavelength λ4 incident from the fiber collimator 171 (first input / output port) via the transmission / reflection means 177 to the fiber collimator 176 (sixth input / output port). ) And further, an optical signal having a fourth wavelength λ4 incident from the fiber collimator 176 (sixth input / output port) is transmitted through the reflection / reflection means 177 to the fiber collimator 171 (first input / output port). )

  As will be described later, the optical multiplexer / demultiplexer according to the tenth embodiment differs from the optical multiplexer / demultiplexer according to the eighth embodiment in the configuration of the first optical transmission unit to the fourth optical transmission unit.

  Specifically, the first light transmission means includes a first wavelength filter 178 disposed in the vicinity of the fiber collimator 173 (third input / output port), and the first wavelength filter 178 includes: Only the optical signal having the first wavelength λ1 is transmitted, and the optical signal having the second to fourth wavelengths λ2 to λ4 is reflected.

  The second light transmission means includes the first wavelength filter 178 described above, the second wavelength filter 179 disposed in the vicinity of the fiber collimator 174 (fourth input / output port), and the first side surface of the housing. And a total reflection mirror 182 as a first reflecting means arranged on the side.

  The second wavelength filter 179 transmits only the optical signal having the second wavelength λ2, and reflects the optical signal having the third wavelength λ3 and the fourth wavelength λ4. The first total reflection mirror 182 reflects the optical signal having the second to fourth wavelengths λ2 to λ4 reflected by the first wavelength filter 178 toward the second wavelength filter 179, and further reflects the fiber. The optical signal having the second wavelength λ 2 that has entered from the collimator 174 (fourth input / output port) and transmitted through the second wavelength filter 179 is reflected toward the first wavelength filter 178.

  The third light transmission means includes the first wavelength filter 178 and the second wavelength filter 179 described above, a third wavelength filter 180 disposed in the vicinity of the fiber collimator 175 (fifth input / output port), And a total reflection mirror 182 as a second reflecting means disposed on the first side surface in the housing. The third wavelength filter 180 transmits only the optical signal having the third wavelength λ3 and reflects the optical signal having the fourth wavelength λ4. The total reflection mirror 182 reflects the optical signal having the third wavelength λ3 and the fourth wavelength λ4 reflected by the second wavelength filter 179 toward the third wavelength filter 180, and further, a fiber collimator 175 (first The optical signal having the third wavelength λ 3 that is incident from the input / output port 5 and transmitted through the third wavelength filter 180 is reflected toward the second wavelength filter 179.

  The fourth light transmission means includes a first wavelength filter 178, a second wavelength filter 179, a third wavelength filter 180, and a fiber collimator 176 (sixth input / output port) arranged near the first wavelength filter 178 described above. 4 wavelength filters 181 and a total reflection mirror 182 as a third reflecting means disposed on the first side surface inside the housing.

  The fourth wavelength filter 181 transmits only the optical signal having the fourth wavelength λ4. The total reflection mirror 182 reflects the optical signal having the fourth wavelength λ4 reflected by the third wavelength filter 180 toward the fourth wavelength filter 181, and further, a fiber collimator 176 (sixth input / output port). The optical signal having the fourth wavelength λ 4 that is incident on the first wavelength and passes through the fourth wavelength filter 181 is reflected toward the third wavelength filter 180.

  The fiber collimators 171 to 173 are arranged on a substantially straight line so that the first optical axes of the incoming and outgoing light beams are substantially coincident with each other, and wavelength filters 177 and 178 are respectively provided on the first optical axis. Are arranged at an angle of

  The mirror 182 so that the second to fourth optical axes of the light beams entering and exiting the fiber collimators 174 to 176 are substantially parallel to the first optical axis of the light beams from the fiber collimators 171 and 172 to the fiber collimator 173. Are arranged at a predetermined angle and at a predetermined position with respect to the second optical axis to the fourth optical axis. The wavelength filters 179 to 181 are respectively arranged at predetermined angles with respect to the second optical axis to the fourth optical axis.

  The optical signal having the first wavelength λ 1 is optically coupled between the fiber collimators 171 and 173 via the wavelength filter 177 and the wavelength filter 178. The optical signal having the second wavelength λ 2 is optically coupled between the fiber collimators 171 and 174 via the wavelength filter 177, the wavelength filters 178 and 179, and the mirror 182. The optical signal having the third wavelength λ3 is optically coupled between the fiber collimators 171 and 175 via the wavelength filter 177, the wavelength filters 178 and 180, and the mirror 182. The optical signal having the fourth wavelength λ4 is optically coupled between the fiber collimators 171 and 176 via the wavelength filter 177, the wavelength filters 178 to 180, and the mirror 182. Optical signals having wavelengths other than the first wavelength to the fourth wavelength λ1 to λ4 are optically coupled between the fiber collimators 171 and 172 via the wavelength filter 177.

  In the example shown in FIG. 10, the first reflecting means to the third reflecting means are constituted by a single mirror 182. However, there is no problem even if the mirror 182 is configured to be divided into two or three.

  In the configuration of the optical multiplexer / demultiplexer according to the tenth embodiment, the number of repetitive reflections increases for the optical signal having the fourth wavelength λ4. Instead, the wavelength required in the configuration of FIG. The filter 148 can be omitted.

  FIG. 11 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 11 of the present invention. The optical multiplexer / demultiplexer according to the eleventh embodiment has the same basic configuration as the optical multiplexer / demultiplexer according to the eighth embodiment shown in FIG. 8, and the number of filters and mirrors is the same as that of the eighth embodiment. However, the following points are different.

  Specifically, in the case of the optical multiplexer / demultiplexer according to the eleventh embodiment, the fiber collimators 154 and 155 as the fourth input / output ports and the fifth input / output ports arranged on the second side surface of the housing. The position of is different. That is, in the form according to the eleventh embodiment, the fiber collimators 153 to 156 as the third input / output ports through the sixth input / output ports are arranged in this order from the top to the bottom with respect to the paper surface on the second side surface of the housing. Is arranged in.

  Further, the positions of the wavelength filters 160 and 161 and the mirrors 163 to 165 in the housing are different. That is, the wavelength filters 159 to 162 are arranged in this order from the top to the bottom with respect to the paper surface on the second side surface side of the housing in a state of being close to the fiber collimators 153 to 156, respectively. Then, the mirrors 163 and 165 are arranged in the approximate center of the casing, and the mirror 164 is arranged on the first side surface side of the casing.

  It can be easily understood that the preferable characteristics of the configurations of the optical multiplexer / demultiplexers according to the ninth to eleventh embodiments are the same as those of the optical multiplexer / demultiplexer according to the ninth embodiment. The two fiber collimators 151 and 152 or the fiber collimators 171 and 172 arranged on the first side surface of the housing may be a single two-core collimator. Furthermore, instead of the four fiber collimators 153 to 156 or the fiber collimators 173 to 176 arranged on the second side surface of the casing, it is also possible to use an LD module or a PD module.

  FIG. 12 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexing / demultiplexing unit according to Embodiment 12 of the present invention. This optical multiplexing / demultiplexing unit is configured by using N stages of optical multiplexers / demultiplexers according to any one of the eighth to eleventh embodiments and connecting them in cascade. Therefore, this optical multiplexing / demultiplexing unit is also called a multistage optical multiplexer / demultiplexer.

  In the case of the optical multiplexing / demultiplexing unit shown in FIG. 12, an example is shown in which a fiber collimator composed of a pigtail fiber and a lens is arranged as an optical signal input / output unit. The input / output port disposed on the first side surface of each optical multiplexer / demultiplexer may be a combination of two single-core collimators or a two-core collimator.

  In this optical multiplexing / demultiplexing unit, N optical multiplexers / demultiplexers are cascade-connected so as to correspond to 4 × N wavelengths with respect to a natural number N of 2 or more. As the internal structure of each optical multiplexer / demultiplexer, the optical multiplexer / demultiplexer having any structure described in FIGS. 8 to 11 may be used. However, the (m + 3) wavelength and the 4N wavelength do not necessarily match here, but if they match, it is obvious that m = 4N−3. In general, the relationship 4N ≧ m + 3 is established. Hereinafter, in order to simplify the description, it is assumed that (m + 3) = 4N.

  More specifically, the optical multiplexing / demultiplexing unit includes a first optical multiplexer / demultiplexer to an Nth optical multiplexer / demultiplexer. The first optical multiplexer / demultiplexer is for demultiplexing / multiplexing the first wavelength group including the first wavelength to the fourth wavelength λ1 to λ4. The second optical multiplexer / demultiplexer is for demultiplexing / multiplexing the second wavelength group including the fifth wavelength to the eighth wavelength λ5 to λ8. The Nth optical multiplexer / demultiplexer is for demultiplexing / multiplexing the Nth wavelength group composed of the (4N-3) th wavelength to the 4Nth wavelength λm to (λm + 3).

  The first optical multiplexer / demultiplexer through the Nth optical multiplexer / demultiplexer have first through Nth housings 196, 203,.

  In the first optical multiplexer / demultiplexer, the first casing 196 includes a fiber collimator 197 as a first input / output port and a second input / output port on the first side surface (the left side surface with respect to the paper surface). , 198, and fiber collimators 199 to 202 as third input / output ports to sixth input / output ports on the second side surface (the side surface on the right side with respect to the paper surface).

  In the first optical multiplexer / demultiplexer, the fiber collimator 197 is different from the first housing 196 in the first to fourth N wavelengths λ1 to λ4, λ5 to λ8,. The optical signal having the first wavelength group to the Nth wavelength group consisting of λm + 3) is input and output. The fiber collimator 198 has a second wavelength group to an Nth wavelength group composed of the fifth to fourth N wavelengths λ5 to λ8,..., Λm to (λm + 3) with respect to the first casing 196. For entering and exiting an optical signal having The fiber collimator 199 is for entering / exiting an optical signal having the first wavelength λ1 with respect to the first casing 196. The fiber collimator 200 is for entering / exiting an optical signal having the second wavelength λ2 with respect to the first casing 196. The fiber collimator 201 is for entering / exiting an optical signal having the third wavelength λ3 with respect to the first casing 196. The fiber collimator 202 is for entering / exiting an optical signal having the fourth wavelength λ4 with respect to the first casing 196.

  In the second optical multiplexer / demultiplexer, the second casing 196 includes fiber collimators 204 and 205 on the first side surface (the left side surface with respect to the paper surface), and the second side surface (with respect to the paper surface). Fiber collimators 206 to 209 are provided on the right side surface. The fiber collimator 204 is optically connected to the fiber collimator 198.

  In the second optical multiplexer / demultiplexer, the fiber collimator 204 has a second wavelength composed of the fifth to fourth N wavelengths λ5 to λ8,..., Λm to (λm + 3) with respect to the second housing 203. This is for entering and exiting an optical signal having a wavelength group to an Nth wavelength group. The fiber collimator 205 has the third wavelength group to the Nth wavelength group composed of the ninth wavelength to the fourth N wavelength λ9,..., Λm to (λm + 3) with respect to the second casing 203. This is for entering and exiting an optical signal. The fiber collimator 206 is for entering / exiting an optical signal having the fifth wavelength λ5 with respect to the second casing 203. The fiber collimator 207 is for entering / exiting an optical signal having the sixth wavelength λ6 with respect to the second casing 203. The fiber collimator 208 is for entering / exiting an optical signal having the seventh wavelength λ7 with respect to the second casing 203. The fiber collimator 209 is for entering / exiting an optical signal having the eighth wavelength λ8 with respect to the second casing 203.

  In the Nth optical multiplexer / demultiplexer, the Nth housing 210 has (6N-5) and (6N-4) fiber collimators 211 on its first side surface (the left side surface with respect to the paper surface). 212, and the (6N-3) th fiber collimator to the 6Nth fiber collimators 213 to 216 are provided on the second side surface (the right side surface with respect to the paper surface). The (6N-5) th fiber collimator 211 is optically connected to the {6 (N-1) -4} th fiber collimator (not shown) of the (N-1) optical multiplexer / demultiplexer. .

  In the Nth optical multiplexer / demultiplexer, the (6N-5) -th fiber collimator 211 from the (4N-3) th wavelength to the 4Nth wavelength λm to (λm + 3) with respect to the Nth case 210. The optical signal having the Nth wavelength group is input and output. The (6N-4) th fiber collimator 212 is not used in this example. The (6N-3) -th fiber collimator 213 is for entering / exiting an optical signal having the (4N-3) -th wavelength λm with respect to the N-th casing 210. The (6N-2) -th fiber collimator 214 is for entering / exiting an optical signal having a (4N-2) -th wavelength λm + 1 with respect to the N-th casing 210. The (6N−1) th fiber collimator 215 is for entering and exiting an optical signal having a (4N−1) th wavelength λm + 2 with respect to the Nth casing 210. The 6N fiber collimator 216 is for entering and exiting an optical signal having a 4N wavelength λm + 3 with respect to the Nth housing 210.

  In the optical multiplexing / demultiplexing unit shown in FIG. 12, the present inventors set N = 4 and the center wavelengths of the optical signals having the first to 16th wavelengths λ1 to λ16 to be used are 1.27 μm and 1.29 μm. , 1.31 μm, 1.33 μm to 1.51 μm, 1.53 μm, 1.55 μm, and 1.57 μm, the insertion loss is 0.7 dB or less, and the isolation is 30 dB or more. It was confirmed that good results were obtained. Of course, the wavelength to be selected is not limited to the above-described value, and can be arbitrarily selected as long as it satisfies the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band.

  The optical multiplexing / demultiplexing unit according to the twelfth embodiment described above has a configuration corresponding to 16 wavelengths, but the optical multiplexing / demultiplexing unit of the present invention is not limited to this, and in principle 32 wavelengths can be combined. , 64 wavelengths, and even 128 other wavelengths such as 128 wavelengths (indicating that it is possible to multiplex that number) is applicable.

  Next, the first optical multiplexer / demultiplexer is connected in cascade so as to correspond to a P × N (P is an integer of 3 or more) wavelength with respect to a natural number N of 2 or more. The optical multiplexing / demultiplexing unit will be described.

  In the case of this optical multiplexing / demultiplexing unit, the nth (an integer satisfying 1 ≦ n ≦ N) optical multiplexer / demultiplexer is the nth wavelength composed of the {P (n−1) +1} wavelength to the Pn wavelength. For demultiplexing / multiplexing an optical signal having a group into another optical signal, or for demultiplexing / multiplexing an optical signal having an nth wavelength group from another optical signal, The optical multiplexer / demultiplexer through the Nth optical multiplexer / demultiplexer respectively have a first housing through an Nth housing. The first to Nth housings have first and second side surfaces that face each other.

  The nth optical multiplexer / demultiplexer has {Q (n−1) +1} th input / output ports and {Q (n) arranged on the first side surface of the nth housing with respect to Q equal to P + 2. -1) +2} input / output ports and {Q (n-1) +3} input / output ports through Qn input / output ports arranged on the second side surface of the nth housing.

  The {Q (n−1) +1} input / output port receives an optical signal having an nth wavelength group and an optical signal having an (n + 1) th wavelength group to an Nth wavelength group. It is for entering and exiting the body. The {Q (n−1) +2} input / output ports are for inputting / exiting optical signals of the (n + 1) th wavelength group to the Nth wavelength group to / from the nth housing (however, , When n is equal to N, there is no light signal incident / exit). The {Q (n−1) +3} th input / output port through the Qnth input / output port input and output optical signals having wavelengths of {P (n−1) +1} through Pn, respectively. belongs to.

  The {Q (n-1) +2} input / output ports of the nth casing are optically coupled to the (Qn + 1) th input / output ports of the (n + 1) th casing (provided that n When N is equal to N, there is no connection destination). Further, the nth casing is arranged in the vicinity of the {Q (n−1) +1} th input / output port and the {Q (n−1) +2} th input / output port. And a {P (n−1) +1} th light transmission means to a Pnth light transmission means.

  The nth transmission / reflection means transmits an optical signal having the nth wavelength group among the optical signals incident from the {Q (n−1) +1} input / output ports, and (n + 1) th. An optical signal having a wavelength group to an Nth wavelength group is reflected toward the {Q (n−1) +2} input / output port, and is further incident from the {Q (n −) + 2} input / output port. The optical signal having the (n + 1) th wavelength group to the Nth wavelength group is reflected, and the reflected optical signal having the (n + 1) th wavelength group to the Nth wavelength group is incident from the second side surface side. Are combined with the optical signal having the nth wavelength group and output toward the {Q (n-1) +1} input / output port.

  The {P (n−1) +1} th light transmission means through the Pnth light transmission means are incident from the {Q (n−1) +1} input / output ports via the nth transmission / reflection means, respectively. Transmitting the optical signal having the {P (n-1) +1} th to Pn th wavelengths to the {Q (n-1) +3} input / output ports to the Qn input / output ports; Further, an optical signal having a wavelength of {P (n−1) +1} th to Pn that is incident from the {Q (n−1) +3} input / output port to the Qn input / output port. The signal is transmitted toward the {Q (n-1) +1} input / output port through the transmission / reflection means.

  The specific manufacturing method of the optical multiplexing / demultiplexing unit according to the twelfth embodiment of the present invention is the same as that of the optical multiplexer / demultiplexer described in the eighth or ninth embodiment, and the preferable characteristics thereof are also in these cases. Since this is the same, the description is omitted.

  FIG. 13 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexing / demultiplexing unit according to Embodiment 13 of the present invention. This optical multiplexing / demultiplexing unit is configured to be connected to an optical multiplexer / demultiplexer according to any one of the eighth to eleventh embodiments in series / parallel to support ultra high density wavelength multiplexing (DWDM). Is.

  In the case of this optical multiplexing / demultiplexing unit, the wavelength selection range of the first-stage optical multiplexing / demultiplexing unit is set large, and a wavelength filter having a fine selection range may be used for the second and subsequent stages.

  Specifically, the first-stage optical multiplexer / demultiplexer includes a housing 223, and a first input / output port and a second input / output port arranged on the first side surface of the housing 223. Collimators 226 and 227 and fiber collimators 228 to 231 as third to sixth input / output ports arranged on the second side surface of the housing 223 are provided.

  The second-stage optical multiplexer / demultiplexer includes a housing 224, a fiber collimator 232 serving as a first input / output port disposed on the first side surface of the housing 224, and a second side surface of the housing 224. Fiber collimators 233 to 236 as the second input / output ports to the fifth input / output ports are arranged. The fiber collimator 228 of the first-stage optical multiplexer / demultiplexer and the fiber collimator 232 of the second-stage optical multiplexer / demultiplexer are optically coupled.

  The third-stage optical multiplexer / demultiplexer includes a housing 225, a fiber collimator 237 serving as a first input / output port disposed on the first side surface of the housing 225, and a second side surface of the housing 225. Fiber collimators 238 to 241 serving as the second input / output ports to the fifth input / output ports are arranged. The fiber collimator 238 of the second-stage optical multiplexer / demultiplexer and the fiber collimator 237 of the third-stage optical multiplexer / demultiplexer are optically coupled.

  The optical multiplexer / demultiplexer or the optical multiplexing / demultiplexing unit of the present invention is not limited to the configurations and forms described in the eighth to thirteenth embodiments, and does not depart from the technical gist of the present invention. Various changes are possible. For example, the applicable range of the present invention extends to the case of constructing an optical multiplexer / demultiplexer having a large number of wavelengths such as 6 wavelengths, 8 wavelengths, or 16 wavelengths (indicating that the number of wavelengths can be multiplexed). Is. In particular, the present invention can be sufficiently applied to a high-density wavelength division multiplexing (DWDM) optical multiplexing / demultiplexing unit having a very narrow wavelength interval. In other words, a configuration for multiplexing 6 wavelengths or more can be handled by simply increasing the number of wavelength filters, or by combining a plurality of configurations of 2 wavelengths and 4 wavelengths, and for high density wavelength multiplexing. The optical multiplexing / demultiplexing unit can be dealt with by connecting the optical multiplexer / demultiplexer, which is a basic configuration, in series / parallel.

  Hereinafter, the optical multiplexer / demultiplexer of the present invention will be described in detail with reference to some examples, including its manufacturing process.

  FIG. 14 is a schematic diagram illustrating a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 14 of the present invention.

  The optical multiplexer / demultiplexer according to the fourteenth embodiment has one optical multiplexer / demultiplexer function as an optical wavelength multiplexing communication function in the vicinity of the outer side on one side of the opposing wall surface in the casing 256 formed to be able to transmit three light beams. By providing one fiber collimator 251 having an input / output port and two fiber collimators 252 and 253 each having one input / output port in the vicinity of the other side on the other side, light of two different wavelengths λ1 and λ2 can be obtained. Are input separately from two fiber collimators 252 and 253 and multiplexed to one fiber collimator 251, or are input from one fiber collimator 251 and split into two fiber collimators 252 and 253. It is configured to be able to enter / exit at.

  More specifically, in the case of the optical multiplexer / demultiplexer according to the first embodiment, light having one wavelength λ1 at two different wavelengths λ1 and λ2 is transmitted and light having the other wavelength λ2 is reflected. A wavelength filter 254 and a mirror 255 that totally reflects the light having the other wavelength λ <b> 2 are provided in the housing 256.

  Further, one fiber collimator 251 and one fiber collimator 252 in the two fiber collimators 252 and 253 are arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams are substantially coincident with each other. 254 is arranged at a predetermined angle on the optical axis, and the mirror 255 has two optical fiber collimators 252 and 253, and the optical axis of the light beam incident / exited by the other fiber collimator 253 is from one fiber collimator 251 to 2. Two fiber collimators 252 and 253 have two fiber collimators 252 and 253 with the other fiber collimator 253 so as to be substantially parallel to the optical axis of the light beam coupled to one fiber collimator 252. It is placed at a predetermined position at a predetermined angle with respect to the optical axis of the incoming and outgoing light rays. That.

  Thereby, the light of one wavelength λ1 is optically coupled via the wavelength filter 254 between one fiber collimator 251 and one fiber collimator 252 in the two fiber collimators 252 and 253, and the other The light of wavelength λ2 is optically coupled between the one fiber collimator 251 and the other fiber collimator 253 in the two fiber collimators 252 and 253 via the wavelength filter 254 and the mirror 255. It has become.

  The fiber collimators 251, 252, and 253 here are composed of optical fibers and lenses, and function as optical signal input / output means. The positions of the optical fiber and the lens are arranged at positions where the optical signal becomes collimated light. In the case where the number of wavelength multiplexed signals is two, only one wavelength filter 254 using a dielectric multilayer film is required, and similarly one mirror 255 is provided.

  FIG. 15 shows the wavelength selection characteristics of the wavelength filter 254 used in this optical multiplexer / demultiplexer in relation to the transmittance (%) with respect to the wavelength λ. FIG. 15 shows that the wavelength filter 254 has a wavelength selection characteristic that transmits the wavelength λ1 having a predetermined range and reflects the wavelength λ2 having the predetermined range.

  In the case of the demultiplexing operation in this optical multiplexer / demultiplexer, first, the light of wavelength λ1 and the wavelength λ2 incident from the fiber collimator 251 are transmitted by the wavelength filter 254 and coupled to the fiber collimator 252. The fiber collimators 251 and 252 and the wavelength filter 254 are aligned and fixed. Next, the fiber collimator 253 and the mirror 255 are aligned and fixed so that the light of the wavelength λ 2 reflected by the wavelength filter 254 is reflected by the mirror 255 so as to be reflected and coupled to the fiber collimator 253. .

  For this reason, the light of wavelength λ1 and wavelength λ2 incident from the fiber collimator 251 results in that the light of wavelength λ1 is coupled to the fiber collimator 252 and the light of wavelength λ2 is coupled to the fiber collimator 253. Thus, the demultiplexing operation is performed.

  On the other hand, in the case of the multiplexing operation, first, the adjustment of the fiber collimators 251 and 252 and the wavelength filter 254 is performed so that the light having the wavelength λ 1 incident from the fiber collimator 252 passes through the wavelength filter 254 and is coupled to the fiber collimator 251. The wick is fixed. Next, after the light of wavelength λ2 incident from the fiber collimator 253 is reflected by the mirror 255 and reflected by the wavelength filter 254, the optical axis coincides with the light of wavelength λ1 incident from the fiber collimator 252. The fiber collimator 253 and the mirror 255 are aligned and fixed so as to be coupled to the fiber collimator 251.

  Therefore, both the light of wavelength λ1 incident from the fiber collimator 252 and the light of wavelength λ2 incident from the fiber collimator 253 are coupled to the fiber collimator 251 as a result, and the multiplexing operation is thus performed. Is called.

  Although the fiber collimators 252 and 253 are illustrated as being arranged in parallel in the vicinity of the other side of the opposite wall surface of the casing 256, the fiber collimators 251, 252, and 253 as optical elements are illustrated. May need to be adjusted slightly depending on the light incident / exit angle, the manufacturing accuracy of the wavelength filter 254 and the mirror 255, the mounting accuracy of each optical element with respect to the housing 256, and the like. , Can be arranged generally parallel.

  In the case of the optical multiplexer / demultiplexer according to the fourteenth embodiment, with respect to light incident from or coupled to the fiber collimator 251, the wavelength λ1 is in the range of 1.543 to 1.557 μm, and the wavelength λ2 is in the range of 1.563 to 1.577 μm. As a result, an insertion loss of 0.7 dB or less and an isolation of 30 dB or more were obtained, and good results were obtained. The range of wavelengths that can be selected here is not limited to the above-mentioned range, but can be arbitrarily selected as long as it satisfies the propagation conditions in the single mode from the 1.3 μm band to the 1.6 μm band. Is possible. In the actual operation, the case where almost two wavelengths λ1 and λ2 are used is described as a normal state. However, for example, only one of the two wavelengths λ1 and λ2 is input and output. There is no problem in operation.

  The specific manufacturing process for the optical multiplexer / demultiplexer according to Embodiment 14 will be described below. First, a holder for the fiber collimators 251, 252, and 253 to be held is processed on the stainless steel casing 256, and the wavelength filter 254 and the mirror 255 by a dielectric multilayer film built in a predetermined place are roughly arranged. Marking for positioning was performed.

  Prior to the active alignment operation, a wavelength filter 254 that transmits light having a wavelength λ1 in a range of 1.543 to 1.557 μm and reflects light having a wavelength λ2 in a range of 1.563 to 1.577 μm and a wavelength λ2 A mirror 255 that reflects light in a range of 1.563 to 1.577 μm was positioned and temporarily fixed by a handling jig interlocked with a micrometer according to the marking.

  Next, alignment work for coupling light from the fiber collimator 251 with the wavelength λ1 in the range of 1.543 to 1.557 μm through the wavelength filter 254 to the fiber collimator 252 was performed. Here, the fiber collimators 251 and 252 and the wavelength filter 254 are finely adjusted by making light of a predetermined wavelength in the above-mentioned wavelength λ1 range of 1.543 to 1.557 μm, and aligned so that the coupling efficiency is maximized. Worked.

  Although the alignment work here was less than 5 minutes, the coupling loss including the fiber collimators 251 and 252 was considerably less than 1 dB. Thereafter, the fiber collimators 251 and 252 were firmly fixed with metal solder, and the wavelength filter 254 was firmly fixed with an ultraviolet curable optical adhesive. Incidentally, almost no increase in loss due to this fixing work was observed.

  Further, light having a wavelength λ 2 in the range of 1.563 to 1.577 μm was incident from the fiber collimator 251 and reflected by the wavelength filter 254. The light in the range of 1.563 to 1.577 μm in the wavelength λ 2 reflected by the wavelength filter 254 is totally reflected by the mirror 255 made of a dielectric multilayer film and is reflected and coupled to the fiber collimator 253. At this time, the coupling efficiency is improved. The mirror 255 and the fiber collimator 253 were finely adjusted with a micrometer so as to rise. Thereafter, in the same manner as described above, the fiber collimator 253 was fixed with metal solder, and the mirror 255 was fixed with an optical adhesive. At this time, the housing 256 and the fiber collimator 252 were firmly held by the holding jig so that the misalignment of the fiber collimator 252 did not occur.

  In this way, the optical multiplexer / demultiplexer according to Example 14 was manufactured (manufactured). In the case of this optical multiplexer / demultiplexer, a dielectric multilayer film that totally reflects light having a specific wavelength (light having a wavelength λ2 in the range of 1.563 to 1.577 μm) as an optical element disposed in the housing 256. Therefore, the fiber collimators 251, 252, and 253 having the input / output force ports can be disposed on the preferable end face of the casing 256, and the spatial light within the casing 256 is used. The number of fiber collimators 251, 252, and 253 can be reduced, so that the number of parts can be reduced and the cost can be reduced, and a space for storing the extra length of the fiber in the housing 256 can be provided. It is not necessary to provide components, and it is possible to reduce the size of the components. As a result, the arrangement of the input / output ports can be simplified according to the required number of wavelength multiplexing. A high-performance product that can reduce the size of the module is obtained.

  The basic configuration of the optical multiplexer / demultiplexer according to the fourteenth embodiment is compatible with two wavelengths. However, if a wavelength filter and a total reflection mirror are appropriately combined, the configuration is not limited to this configuration, and in principle 8 The present invention can also be applied to configurations corresponding to wavelengths (8 wave multiplexing), 16 wavelengths (16 wave multiplexing), and further 32 wavelengths (32 wave multiplexing).

  FIG. 16 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 15 of the present invention.

  The optical multiplexer / demultiplexer according to the fifteenth embodiment has, as an optical wavelength multiplexing communication function, one outer side near one of the opposing wall surfaces in the casing 281 formed so as to be able to transmit five light beams. It includes one fiber collimator 268 having an input / output port, four fiber collimators 269, 270, 271, 272 each having one input / output port in the vicinity of the other side on the other side, and four different wavelengths λ1, Lights of λ2, λ3, and λ4 are separately incident from four fiber collimators 269, 270, 271, and 272 and are combined into one fiber collimator 268, or incident from one fiber collimator 268 and four fiber collimators. Bi-directional input / output is possible by demultiplexing to 269, 270, 271, 272.

  Specifically, in the case of the optical multiplexer / demultiplexer according to the fifteenth embodiment, light having the first wavelength λ1 and the second wavelength λ2 at four different wavelengths λ1, λ2, λ3, and λ4 is transmitted. And a first wavelength filter 273 that reflects light of the third wavelength λ3 and the fourth wavelength λ4, and a second that transmits light of the first wavelength λ1 and reflects light of the second wavelength λ2. Wavelength filter 274, a third wavelength filter 275 that transmits only light of the second wavelength λ2, and a fourth wavelength that transmits light of the third wavelength λ3 and reflects light of the fourth wavelength λ4. A wavelength filter 276, a fifth wavelength filter 277 that transmits only light of the fourth wavelength λ4, a first mirror 278 that totally reflects light of the second wavelength λ2, and a third wavelength λ3 and a fourth wavelength λ3. A second mirror 279 that totally reflects light having the wavelength λ4 and a third mirror that totally reflects light having the fourth wavelength λ4. And the mirror 280 is deployed in the housing 281.

  Further, the one fiber collimator 268 and the first fiber collimator 269 in the four fiber collimators 269, 270, 271, and 272 are substantially in a straight line so that the optical axes of the incoming and outgoing light beams substantially coincide with each other. The first wavelength filter 273 and the second wavelength filter 274 are respectively arranged at predetermined angles on the optical axis, and the first mirror 278, the second mirror 279, and the third mirror 280 are The fiber collimator 268 has a single optical axis for light rays entering and exiting the second fiber collimator 270, the third fiber collimator 271, and the fourth fiber collimator 272 in the four fiber collimators 269, 270, 271, and 272. To be substantially parallel to the optical axis of the light beam coupled to the first fiber collimator 269 A third wavelength filter 275 is disposed at a predetermined position at a predetermined angle with respect to the optical axis of the light entering and exiting the second fiber collimator 270, the third fiber collimator 271, and the fourth fiber collimator 272. , Fourth wavelength filter 276, and fifth wavelength filter 277 are arranged at predetermined angles with respect to the respective optical axes.

  Thereby, the light of the first wavelength λ1 is optically coupled between the one fiber collimator 268 and the first fiber collimator 269 via the first wavelength filter 273 and the second wavelength filter 274, The light having the second wavelength λ 2 is transmitted between the first wavelength filter 273, the second wavelength filter 274, and the third wavelength filter 275 between the first fiber collimator 268 and the second fiber collimator 270. The light having the third wavelength λ3 is optically coupled through the mirror 278, and the first wavelength filter 273 and the fourth wavelength filter 276 are transmitted between the one fiber collimator 268 and the third fiber collimator 271. And the second mirror 279, and the light having the fourth wavelength λ4 is coupled to one fiber collimator 268 and the fourth fiber collimator. Optically coupled to the data 272 via the first wavelength filter 273, the fourth wavelength filter 276, and the fifth wavelength filter 277, the third mirror 279, and the fourth mirror 280. It is like that.

  The fiber collimators 268, 269, 270, 271, and 272 here are made up of pigtail fibers and lenses and function as optical signal input / output means. The positions of the pigtail fiber and the lens are arranged at positions where the optical signal becomes collimated light. When the number of wavelength multiplexed signals is four, there are five required wavelength filters 273, 274, 275, 276, and 277 made of a dielectric multilayer film. Similarly, there are three total reflection mirrors 278, 279, and 280. It has become. The wavelength filters 273, 274, 275, 276, and 277 are the same as those described in the fourteenth embodiment with reference to FIG. 15, and indicate wavelengths in a predetermined range (that is, λ1, λ2, λ3, and λ4, respectively). ) And a wavelength selection characteristic that reflects the other wavelength range.

  In the case of the demultiplexing operation in this optical multiplexer / demultiplexer, first, the light of the wavelengths λ1 to λ4 incident from the fiber collimator 268 is selectively transmitted by the wavelength filter 273 and the wavelengths λ3 and λ4 are transmitted. The wavelength filter 274 transmits only the light of wavelength λ1 through the wavelength filter 274 and couples it to the fiber collimator 269. Thus, the wavelength filters 273 and 274 and the fiber collimators 268 and 269 are aligned and fixed. Next, the wavelength filter 275, the mirror 278, and the fiber collimator 270 are reflected so that the light of the wavelength λ 2 reflected by the wavelength filter 274 is reflected by the mirror 278 so as to pass through the wavelength filter 275 and then coupled to the fiber collimator 270. Aligning and fixing with Further, the light of the wavelengths λ 3 and λ 4 reflected by the wavelength filter 273 is reflected by the mirror 279 so that only the light of wavelength λ 3 is transmitted through the wavelength filter 276 and coupled to the fiber collimator 271. 279 and the wavelength filter 276 and the fiber collimator 271 are aligned and fixed. Finally, the light of the wavelength λ 4 reflected by the wavelength filter 276 is reflected so as to be folded back by the mirror 280, and the light of the wavelength λ 4 is transmitted through the wavelength filter 277 and coupled to the fiber collimator 272. The wavelength filter 277 and the fiber collimator 272 are aligned and fixed.

  Therefore, as for the light of wavelengths λ1 to λ4 incident from the fiber collimator 268, the light of wavelength λ1 is coupled to the fiber collimator 269, the light of wavelength λ2 is coupled to the fiber collimator 270, and the light of wavelength λ3 is coupled to the fiber collimator. Then, the light having the wavelength λ4 is coupled to the fiber collimator 272, and thus the demultiplexing operation is performed.

  On the other hand, in the case of the multiplexing operation, first, the wavelength filters 273 and 274 and the fiber so that the light having the wavelength λ 1 incident from the fiber collimator 269 passes through the wavelength filter 274 and the wavelength filter 273 and is coupled to the fiber collimator 268. Alignment and fixing with the collimators 268 and 269 are performed. Next, the light of wavelength λ2 incident from the fiber collimator 270 passes through the wavelength filter 275, is totally reflected so as to be folded back by the mirror 278, is incident on the wavelength filter 274, and is further reflected by the wavelength filter 274. The wavelength filter 275, the mirror 278, and the fiber collimator 270 are aligned and fixed so that the optical axis of the light beam coincides with the optical axis and passes through the wavelength filter 273 and is coupled to the fiber collimator 268. Further, the light of wavelength λ3 incident from the fiber collimator 271 passes through the wavelength filter 276, is totally reflected so as to be folded back by the mirror 279, is incident on the wavelength filter 273, is further reflected by the wavelength filter 273, and is then reflected by the wavelength λ1. The wavelength filter 276, the mirror 279, and the fiber collimator 271 are aligned and fixed so that the light and the optical axis are aligned and coupled to the fiber collimator 268. Finally, the light of wavelength λ4 incident from the fiber collimator 272 passes through the wavelength filter 277, is totally reflected so as to be folded back by the mirror 280, is incident on the wavelength filter 276, and is further reflected by the wavelength filter 276. The optical axis coincides with the optical axis, and is totally reflected so as to be folded back by the mirror 279, and is incident on the wavelength filter 273. After being reflected by the wavelength filter 273, the optical axis of the light of wavelength λ1 coincides with that of the fiber collimator. The wavelength filter 277, the mirror 280, and the fiber collimator 272 are aligned and fixed so as to be coupled to H.268.

  Therefore, the light of wavelength λ1 incident from the fiber collimator 269, the light of wavelength λ2 incident from the fiber collimator 270, the light of wavelength λ3 incident from the fiber collimator 271 and the light of wavelength λ4 incident from the fiber collimator 272 As a result, both are coupled to the fiber collimator 268, and the multiplexing operation is performed in this way.

  Incidentally, in this optical multiplexer / demultiplexer, when only the multiplexing function is required or when high isolation is not required for the demultiplexing function, either or both of the wavelength filters 275 and 277 are omitted. You can also

  In addition, about the fiber collimators 269, 270, 271, and 272 here, the aspect arrange | positioned in parallel in the vicinity of the other side of the wall surface which the housing | casing 281 opposes is illustrated, However As each optical element, The light incident / exit angles of the fiber collimators 268, 269, 270, 271, 272, the manufacturing accuracy of the wavelength filters 273, 274, 275, 276, 277, the mirrors 278, 279, 280, and the housing 281 of each optical element Although it may be necessary to make some adjustments depending on the mounting accuracy and the like, it may not be completely parallel, but can be arranged substantially in parallel.

  In the case of the optical multiplexer / demultiplexer according to the sixteenth embodiment, the center wavelengths of the four wavelengths λ1, λ2, λ3, and λ4 are set to 1.49 μm and 1.51 μm with respect to the light incident from or coupled to the fiber collimator 268. , 1.53 μm and 1.55 μm, the insertion loss was 0.7 dB or less, and the isolation was 30 dB or more. The center wavelength selected here is not limited to the above-mentioned value, but can be arbitrarily selected as long as it is in a range satisfying the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band. Is possible.

  By the way, the specific manufacturing process for the optical multiplexer / demultiplexer according to the fifteenth embodiment is the same as that described in the fourteenth embodiment, and the preferable characteristics (operation effects) of the optical multiplexer / demultiplexer are also the same. The description is omitted. The basic configuration of the optical multiplexer / demultiplexer according to the fifteenth embodiment is also compatible with four wavelengths. However, if a wavelength filter and a total reflection mirror are combined, the configuration is not limited to this configuration, and in principle 8 The present invention can also be applied to configurations corresponding to wavelengths (8 wave multiplexing), 16 wavelengths (16 wave multiplexing), and further 32 wavelengths (32 wave multiplexing).

  FIG. 17 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 16 of the present invention.

  The optical multiplexer / demultiplexer according to the sixteenth embodiment has an optical wavelength division multiplexing communication function of 1 in the outer vicinity of one side of the opposing wall surface in the casing 297 formed to be able to transmit seven light beams. Three fiber collimators 283, 284, 285 having one input / output port, four fiber collimators 282, 286, 287, 288 having one input / output port in the vicinity of the other side on the other side, and 6 A second fiber collimator 286 and a second fiber collimator 286 in the three fiber collimators 283, 284, 285 and the four fiber collimators 282, 286, 287, 288 are transmitted with light having different wavelengths λ1, λ2, λ3, λ4, λ5, λ6. The three fiber collimators 287 and the fourth fiber collimator 288 separately enter the four fiber collimators 282. The first fiber collimator 282 is coupled to the first fiber collimator 282 or incident from the first fiber collimator 282 and three fiber collimators 283, 284, 285 and four fiber collimators 282, 286 are disposed. Bi-directional input / output is possible by splitting the signals into the second fiber collimator 286, the third fiber collimator 287, and the fourth fiber collimator 288 in 287 and 288.

  More specifically, in the case of the optical multiplexer / demultiplexer according to the sixteenth embodiment, the first wavelength λ1, the second wavelength λ2, in six different wavelengths λ1, λ2, λ3, λ4, λ5, λ6. And a first wavelength filter 289 that transmits light of the third wavelength λ3 and reflects light of the fourth wavelength λ4, the fifth wavelength λ5, and the sixth wavelength λ6, and the first wavelength λ1 A second wavelength filter 290 that transmits light and reflects light of the second wavelength λ2 and third wavelength λ3; and transmits light of the second wavelength λ2 and transmits light of the third wavelength λ3. The third wavelength filter 291 to be reflected, the fourth wavelength filter 292 that transmits only the light of the third wavelength λ3, the light of the fourth wavelength λ4, and the fifth wavelength λ5 and the sixth wavelength A fifth wavelength filter 293 that reflects light of wavelength λ6; transmits light of fifth wavelength λ5; and transmits light of sixth wavelength λ6. A sixth wavelength filter 294 that reflects light; a seventh wavelength filter 295 that transmits only light of the sixth wavelength λ6; and a first wavelength that reflects light of the second wavelength λ2 and the third wavelength λ3. A mirror 296 having a mirror surface and a second mirror surface that reflects light of the fifth wavelength λ5 and the sixth wavelength λ6 on each side is provided in the housing 297.

  Further, the first fiber collimator 282 and the first fiber collimators 283 in the three fiber collimators 283, 284, 285 are arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams are substantially coincident with each other. The first wavelength filter 289 and the second wavelength filter 290 are arranged at predetermined angles on the optical axis, respectively, and the third wavelength filter 291, the fourth wavelength filter 292, and the mirror 296 include three The optical axes of light rays entering and exiting the second fiber collimator 284 and the third fiber collimator 285 in the fiber collimators 283, 284, 285 are the first ones in which the optical axes of the four fiber collimators 282, 286, 287, 288 are present. First fiber collimator 282 to three fiber collimators 283, 284, 285. The three fiber collimators 283, 284, and 285 enter and exit the second fiber collimator 284 and the third fiber collimator 285 so as to be substantially parallel to the optical axis of the light beam coupled to the fiber collimator 283. The second fiber collimator 286 and the fifth wavelength filter 293 in the four fiber collimators 282, 286, 287, and 288 are arranged at a predetermined position at a predetermined angle with respect to the optical axis of the light beam. The third fiber collimator 287 and the fourth fiber collimator are arranged in the four fiber collimators 282, 286, 287, and 28, so that the optical axes thereof coincide with the direction of the light reflected by the first wavelength filter 289. 288, the sixth wavelength filter 294, and the seventh wavelength filter 295 include four fiber collimators. The optical axes of light rays entering and exiting the third fiber collimator 287 and the fourth fiber collimator 288 in the data 282, 286, 287, 288 are in the four fiber collimators 282, 286, 287, 288, respectively. The second fiber collimator 286 is disposed at a predetermined position at a predetermined angle so as to be substantially parallel to the optical axis of the second fiber collimator 286.

  Thereby, the light of the first wavelength λ1 is the first fiber collimator 282 in the four fiber collimators 282, 286, 287, 288 and the first fiber collimator 283, 284, 285 in the first fiber collimator 282. Optically coupled to the fiber collimator 283 via the first wavelength filter 289 and the second wavelength filter 290, and the light of the second wavelength λ 2 is transmitted to the four fiber collimators 282, 286, 287 and 288. Between the first fiber collimator 282 and the second fiber collimator 284 in the three fiber collimators 283, 284, 285, the first wavelength filter 289, the second wavelength filter 290, and the third The light having the third wavelength λ3 is optically coupled via the wavelength filter 291 and the mirror 296. The first wavelength filter 289, between the first fiber collimator 282 in the Iva collimator 282, 286, 287, 288 and the third fiber collimator 285 in the three fiber collimators 283, 284, 285, The second wavelength filter 290, the third wavelength filter 291, and the fourth wavelength filter 292 and the mirror 296 are optically coupled, and the light of the fourth wavelength λ 4 is four fiber collimators 282 and 286. , 287, 288 and the first fiber collimator 282 and the second fiber collimator 286 are optically coupled via the first wavelength filter 289 and the fifth wavelength filter 293 and the mirror 296, The light of the fifth wavelength λ5 is in four fiber collimators 282, 286, 287, 288 The first fiber collimator 282 and the third fiber collimator 287 are optically coupled via the first wavelength filter 289, the fifth wavelength filter 293, and the sixth wavelength filter 294 and the mirror 296, and The light having the wavelength λ6 of 6 is transmitted between the first fiber collimator 282 and the fourth fiber collimator 288 in the four fiber collimators 282, 286, 287, 288. The filter 293, the sixth wavelength filter 294, and the seventh wavelength filter 295 and the mirror 296 are optically coupled.

  The fiber collimators 282, 283, 284, 285, 286, 287, and 288 here are composed of pigtail fibers and lenses, and function as optical signal input / output means. The positions of the pigtail fiber and the lens are arranged at positions where the optical signal becomes collimated light. When the number of wavelength multiplexed signals is 6, the required number of wavelength filters 289, 290, 291, 292, 293, 294, and 295 using dielectric multilayer films is seven, and similarly, the number of mirrors 296 is one. Yes. The wavelength filters 289, 290, 291, 292, 293, 294, and 295 are the same as those described in the fourteenth embodiment with reference to FIG. 15, and each has a predetermined range of wavelengths (ie, λ1, λ2 respectively). , Λ3, λ4, λ5, and λ6), and wavelength selection characteristics that reflect the other wavelength ranges.

  In the case of the demultiplexing operation in this optical multiplexer / demultiplexer, first, the light of wavelengths λ1 to λ3 is selectively transmitted by the wavelength filter 289 with respect to the light of wavelengths λ1 to λ6 incident from the fiber collimator 282, and the wavelengths λ4 to λ6 are transmitted. The wavelength filter 290 transmits only the light of wavelength λ1 through the wavelength filter 290 and couples it to the fiber collimator 283. Thus, the wavelength filters 289 and 290 and the fiber collimators 282 and 283 are aligned and fixed. Next, the light of the wavelengths λ 2 and λ 3 reflected by the wavelength filter 290 is reflected so as to be folded back by the first mirror surface of the mirror 296, and only the light of the wavelength λ 2 is transmitted through the wavelength filter 291, and then is reflected on the fiber collimator 284. The wavelength filter 291 and the mirror 296 and the fiber collimator 284 are aligned and fixed so as to be coupled. Further, the light of wavelength λ 3 reflected by the wavelength filter 291 is reflected so as to be folded back by the first mirror surface of the mirror 296, and the light of wavelength λ 2 is transmitted through the wavelength filter 292 and then coupled to the fiber collimator 285. The wavelength filter 292 and the fiber collimator 285 are aligned and fixed.

  On the other hand, the wavelength filters 293 and the fiber collimator 286 are aligned so that the light of the wavelengths λ4 to λ6 reflected by the wavelength filter 289 is coupled to the fiber collimator 286 after passing only the light of the wavelength λ4 by the wavelength filter 293. Fixing is performed. Further, the light of wavelengths λ5 and λ6 reflected by the wavelength filter 293 is reflected so as to be folded back by the second mirror surface of the mirror 296, and only the light of wavelength λ5 is transmitted through the wavelength filter 294 and then coupled to the fiber collimator 287. Thus, the wavelength filter 294 and the fiber collimator 287 are aligned and fixed. Further, the light of wavelength λ 6 reflected by the wavelength filter 294 is reflected so as to be folded back by the second mirror surface of the mirror 296, and the light of wavelength λ 6 is transmitted through the wavelength filter 295 and then coupled to the fiber collimator 288. The wavelength filter 295 and the fiber collimator 288 are aligned and fixed.

  For this reason, the light of wavelengths λ1 to λ6 incident from the fiber collimator 282 results in that the light of wavelength λ1 is coupled to the fiber collimator 283, the light of wavelength λ2 is coupled to the fiber collimator 284, and the light of wavelength λ3 is coupled to the fiber collimator. The light of wavelength λ4 is coupled to the fiber collimator 286, the light of wavelength λ5 is coupled to the fiber collimator 287, and the light of wavelength λ6 is coupled to the fiber collimator 288. Operation is performed.

  On the other hand, in the case of the multiplexing operation, first, the wavelength filters 289 and 290 and the fiber so that the light having the wavelength λ 1 incident from the fiber collimator 283 passes through the wavelength filter 290 and the wavelength filter 289 and is coupled to the fiber collimator 282. Alignment and fixing with the collimators 282 and 283 are performed. Next, the light of wavelength λ 2 incident from the fiber collimator 284 passes through the wavelength filter 291, is totally reflected so as to be folded back by the first mirror surface of the mirror 296, and then enters the wavelength filter 290. The wavelength filter 291, the mirror 296, and the fiber collimator 284 are aligned and fixed so that the optical axis coincides with the light of the wavelength λ 1 after being reflected and passes through the wavelength filter 289 and is coupled to the fiber collimator 282. . Further, the light of wavelength λ 3 incident from the fiber collimator 285 passes through the wavelength filter 292, is totally reflected so as to be folded at the first mirror surface of the mirror 296, enters the wavelength filter 291, and is reflected by this wavelength filter 291. After that, the light having the wavelength λ2 coincides with the optical axis, and is totally reflected so as to be folded back by the first mirror surface of the mirror 296. Then, the light is incident on the wavelength filter 290 and reflected again by the wavelength filter 290. The wavelength filter 292 and the fiber collimator 285 are aligned and fixed so that the optical axis of the light and the optical axis coincide with each other and are coupled to the fiber collimator 282.

  On the other hand, the wavelength filter 293 and the fiber so that the light having the wavelength λ 4 incident from the fiber collimator 286 passes through the wavelength filter 293 and is incident on the wavelength filter 289 and reflected by the wavelength filter 289 and then coupled to the fiber collimator 282. The collimator 286 is aligned and fixed. Further, the light of wavelength λ5 incident from the fiber collimator 287 passes through the wavelength filter 294 and is totally reflected so as to be folded back by the second mirror surface of the mirror 296, and is incident on the wavelength filter 293, and is reflected by the wavelength filter 293. After that, the wavelength filter 294 and the mirror 296 are combined with the fiber collimator 287 so that the light is incident on the wavelength filter 289 and is reflected again by the wavelength filter 289 so that the optical axis coincides with the light of wavelength λ4 and is coupled to the fiber collimator 282. Is aligned and fixed. Further, the light of wavelength λ 6 incident from the fiber collimator 288 passes through the wavelength filter 295, is totally reflected so as to be folded at the second mirror surface of the mirror 296, enters the wavelength filter 294, and is reflected by this wavelength filter 294. After that, the light of wavelength λ5 coincides with the optical axis and is totally reflected so as to be folded back by the second mirror surface of the mirror 296, and is incident on the wavelength filter 293, and is reflected by the wavelength filter 293 and reflected by the wavelength λ4. The wavelength filter 295 and the fiber collimator 288 are aligned and fixed so that the light and the optical axis are aligned and coupled to the fiber collimator 282.

  Therefore, the light of wavelength λ1 incident from the fiber collimator 283, the light of wavelength λ2 incident from the fiber collimator 284, the light of wavelength λ3 incident from the fiber collimator 285, and the light of wavelength λ4 incident from the fiber collimator 286 The light having the wavelength λ5 incident from the fiber collimator 287 and the light having the wavelength λ6 incident from the fiber collimator 288 are both coupled to the fiber collimator 282 as a result, and thus the multiplexing operation is performed. .

  Incidentally, in this optical multiplexer / demultiplexer, when only the multiplexing function is required or when high isolation is not required for the demultiplexing function, either or both of the wavelength filters 292 and 295 are omitted. You can also

  In the case of the optical multiplexer / demultiplexer according to the sixteenth embodiment, with respect to light incident from or coupled to the fiber collimator 282, the center wavelengths of the six wavelengths λ1, λ2, λ3, λ4, λ5, and λ6 are 1.49 μm. , 1.51 μm, 1.53 μm, 1.55 μm, 1.57 μm, 1.59 μm, the insertion loss was 0.7 dB or less, and the isolation was 30 dB or more. . The center wavelength selected here is not limited to the above-mentioned value, but can be arbitrarily selected as long as it is in a range satisfying the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band. Is possible.

  By the way, the specific manufacturing process for the optical multiplexer / demultiplexer according to the sixteenth embodiment is also the same as that described in the fourteenth embodiment, and the same applies to preferable characteristics (effects) of the optical multiplexer / demultiplexer. Therefore, explanation is omitted. The basic configuration of the optical multiplexer / demultiplexer according to the sixteenth embodiment is compatible with six wavelengths. However, if a wavelength filter and a total reflection mirror are combined, the configuration is not limited to this configuration and in principle 8 The present invention can also be applied to configurations corresponding to wavelengths (8 wave multiplexing), 16 wavelengths (16 wave multiplexing), and further 32 wavelengths (32 wave multiplexing).

  FIG. 18 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 17 of the present invention.

  The optical multiplexer / demultiplexer according to the seventeenth embodiment has an optical wavelength division multiplexing communication function in which one optical fiber is provided near the outer side on one side of the opposing wall surface in the housing 312 formed to transmit five light beams. It includes one fiber collimator 301 having an input / output port, and four fiber collimators 302, 303, 304, 305 each having one input / output port in the vicinity of the other side on the other side, and four different wavelengths λ1, Lights of λ2, λ3, and λ4 are separately incident from the four fiber collimators 302, 303, 304, and 305 and multiplexed to one fiber collimator 301, or incident from one fiber collimator 301 and four fiber collimators. It is configured to be able to enter and exit in both directions by demultiplexing into 302, 303, 304, and 305, and each optical element is fixed. It is used one transmissive substrate 311 in order.

  Specifically, in the case of the optical multiplexer / demultiplexer according to the seventeenth embodiment, the light of the first wavelength λ1 at four different wavelengths λ1, λ2, λ3, and λ4 is transmitted, and the other second The first wavelength filter 306 fixed to the translucent substrate 311 that reflects the light of the third wavelength λ2, the third wavelength λ3, and the fourth wavelength λ4, and the light of the second wavelength λ2, and A second wavelength filter 307 fixed to the translucent substrate 311 that reflects the light of the third wavelength λ3 and the fourth wavelength λ4; the light of the third wavelength λ3; and the fourth wavelength λ4 A third wavelength filter 308 fixed to the translucent substrate 311 that reflects the light of the fourth wavelength, a fourth wavelength filter 309 fixed to the translucent substrate 311 that transmits only the light of the fourth wavelength λ4, Translucent substrate 311 that totally reflects light of second wavelength λ2, third wavelength λ3, and fourth wavelength λ4 A mirror 310 fixed to the housing 312 is provided in the housing 312.

  Further, one fiber collimator 301 and the first fiber collimator 302 in the four fiber collimators 302, 303, 304, and 305 are arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams are substantially coincident with each other. The first wavelength filter 306 fixed to the translucent substrate 311 is arranged at a predetermined angle on the optical axis, and the mirror 310 fixed to the translucent substrate 311 includes four fiber collimators 302 and 303. , 304, and 305, the optical axes of the light rays entering and exiting the second fiber collimator 303, the third fiber collimator 304, and the fourth fiber collimator 305 are changed from one fiber collimator 301 to the first fiber collimator 302. The second fiber collimator 303 is substantially parallel to the optical axis of the light beam coupled to A second wavelength filter disposed at a predetermined position at a predetermined angle with respect to the optical axis of light entering and exiting the third fiber collimator 304 and the fourth fiber collimator 305, and fixed to the translucent substrate 311 307, the third wavelength filter 308, and the fourth wavelength filter 309 are arranged at predetermined angles with respect to the respective optical axes.

  Thereby, the light of the first wavelength λ1 is optically coupled between the one fiber collimator 301 and the first fiber collimator 302 via the first wavelength filter 306 fixed to the translucent substrate 311. Then, the light of the second wavelength λ 2 is fixed to the first wavelength filter 306 and the light transmitting substrate 311 fixed to the light transmitting substrate 311 between the one fiber collimator 301 and the second fiber collimator 303. The second wavelength filter 307 and the mirror 310 fixed to the translucent substrate 311 are optically coupled, and the light of the third wavelength λ3 is converted into one fiber collimator 301 and a third fiber collimator. 304, a first wavelength filter 306 fixed to the translucent substrate 311, a second wavelength filter 307 fixed to the translucent substrate 311, and the translucent substrate 3 The third wavelength filter 308 fixed to 1 and the mirror 310 fixed to the translucent substrate 311 are optically coupled, and the light of the fourth wavelength λ4 is transmitted to one fiber collimator 301 and the fourth The first wavelength filter 306 fixed to the translucent substrate 311, the second wavelength filter 307 fixed to the translucent substrate 311, and the first wavelength filter 307 fixed to the translucent substrate 311. The third wavelength filter 308, the fourth wavelength filter 309 fixed to the translucent substrate 311, and the mirror 310 fixed to the translucent substrate 311 are optically coupled.

  The fiber collimators 301, 302, 303, 304, and 305 here are composed of pigtail fibers and lenses, and function as optical signal input / output means. The positions of the pigtail fiber and the lens are arranged at positions where the optical signal becomes collimated light. When the number of wavelength multiplexed signals is four, the required optical elements are four wavelength filters 306, 307, 308, and 309 made of a dielectric multilayer film fixed to one side surface of the translucent substrate 311. Similarly, there is one mirror 310 fixed on the other side surface of the translucent substrate 311 facing the one side surface. Each of the wavelength filters 306, 307, 308, and 309 has a characteristic of transmitting one predetermined range of wavelengths (that is, λ1, λ2, λ3, and λ4, respectively), and other wavelength ranges. It has a wavelength selective characteristic to reflect.

  In the case of the demultiplexing operation in this optical multiplexer / demultiplexer, first, the light of wavelength λ1 is selectively transmitted by the wavelength filter 306 with respect to the light of wavelengths λ1 to λ4 incident from the fiber collimator 301 and coupled to the fiber collimator 302. In addition, the wavelength filters 312 fixed to the fiber collimators 301 and 302 and the translucent substrate 311 are aligned and fixed. Next, the light of the wavelengths λ 2 to λ 4 reflected by the wavelength filter 306 is reflected by the mirror 310 fixed to the light transmitting substrate 311 so that only the light of the wavelength λ 2 is fixed to the light transmitting substrate 311. The wavelength filter 307 and the fiber collimator 303 fixed to the translucent substrate 311 are aligned and fixed so as to be selectively transmitted through the wavelength filter 307 and coupled to the fiber collimator 303. Further, the light of the wavelengths λ3 and λ4 reflected by the wavelength filter 307 is reflected by the mirror 310 so that only the light of the wavelength λ3 is selectively transmitted through the wavelength filter 308 fixed to the translucent substrate 311. Then, the wavelength filter 308 and the fiber collimator 304 fixed to the translucent substrate 311 are aligned and fixed so as to be coupled to the fiber collimator 304. Finally, the light of wavelength λ4 reflected by the wavelength filter 308 fixed to the light-transmitting substrate 311 is reflected by the mirror 310 fixed to the light-transmitting substrate 311 so that the light of wavelength λ4 is transmitted. The wavelength filter 309 fixed to the light transmitting substrate 311 and the fiber collimator 305 are aligned and fixed so that the wavelength filter 309 fixed to the light transmitting substrate 311 is selectively transmitted and coupled to the fiber collimator 305. Is called.

  For this reason, the light of wavelengths λ1 to λ4 incident from the fiber collimator 1 results in that the light of wavelength λ1 is coupled to the fiber collimator 302, the light of wavelength λ2 is coupled to the fiber collimator 303, and the light of wavelength λ3 is coupled to the fiber collimator. The light having the wavelength λ4 is coupled to the fiber collimator 305, and thus the demultiplexing operation is performed.

  On the other hand, in the case of the multiplexing operation, first, the light having the wavelength λ 1 incident from the fiber collimator 302 is transmitted through the wavelength filter 306 fixed to the light transmitting substrate 311 and coupled to the fiber collimator 301. The wavelength filter 306 and the fiber collimators 301 and 302 fixed to the substrate 311 are aligned and fixed. Next, the light of wavelength λ 2 incident from the fiber collimator 303 is transmitted through the wavelength filter 307 fixed to the translucent substrate 311 and totally reflected by the mirror 310 fixed to the translucent substrate 311. After being incident on the wavelength filter 306 fixed to 311, the light is totally reflected by the wavelength filter 306 and fixed to the translucent substrate 311 so that the light of wavelength λ1 coincides with the optical axis and is coupled to the fiber collimator 301. Alignment and fixation of the mirror 310 and the fiber collimator 303 fixed to the wavelength filter 307 and the translucent substrate 311 are performed. Further, the light of wavelength λ 3 incident from the fiber collimator 304 is transmitted through the wavelength filter 308 fixed to the translucent substrate 311, totally reflected by the mirror 310 fixed to the translucent substrate 311, and incident on the wavelength filter 307. After that, the light is totally reflected by the wavelength filter 307, the light axis of the wavelength λ2 coincides with the optical axis, is totally reflected again by the mirror 310, and is incident on the wavelength filter 306, and is further totally reflected by the wavelength filter 306 and is wavelength λ1. The wavelength filter 308 fixed to the translucent substrate 311 and the fiber collimator 304 are aligned and fixed so that the optical axis of the light and the optical axis coincide with each other and are coupled to the fiber collimator 301. Finally, the light having the wavelength λ4 incident from the fiber collimator 305 is transmitted through the wavelength filter 309 fixed to the translucent substrate 311, totally reflected by the mirror 310, and incident on the wavelength filter 314, and then the wavelength filter 308. And is totally reflected by the mirror 310 again and incident on the wavelength filter 307, and further totally reflected by the wavelength filter 307 and the light axis of the wavelength λ2 coincides with the optical axis. Then, the light is again totally reflected by the mirror 310 and incident on the wavelength filter 306, and is then totally reflected by the wavelength filter 306, so that the light of the wavelength λ 1 coincides with the optical axis and is coupled to the fiber collimator 307. The wavelength filter 309 fixed to the optical substrate 311 and the fiber collimator 305 are aligned and fixed.

  For this reason, the light of wavelength λ1 incident from the fiber collimator 302, the light of wavelength λ2 incident from the fiber collimator 303, the light of wavelength λ3 incident from the fiber collimator 304, and the wavelength incident from the fiber collimator 305 As a result, the light of λ4 is coupled to the fiber collimator 301, and the multiplexing operation is performed in this way.

  Incidentally, in this optical multiplexer / demultiplexer, when only the multiplexing function is required or when high isolation is not required for the demultiplexing function, the wavelength filter 309 can be omitted.

  The fiber collimators 302, 303, 304, and 305 here are illustrated as being arranged in parallel in the vicinity of the other side of the opposite wall surface of the housing 312. Light incident / exit angles of the fiber collimators 302, 303, 304, and 305, manufacturing accuracy of the wavelength filters 306, 307, 308, and 309 fixed to the translucent substrate 311 and the mirror 310 fixed to the translucent substrate 311 In addition, since it is necessary to make some adjustments depending on the mounting accuracy of each optical element with respect to the housing 312 and the like, there is a possibility that the optical elements are not completely parallel, but they can be arranged substantially in parallel.

  In the case of the optical multiplexer / demultiplexer according to the seventeenth embodiment, the center wavelengths of the four wavelengths λ1, λ2, λ3, and λ4 are set to 1.27 μm and 1.29 μm with respect to the light incident from or coupled to the fiber collimator 301. , 1.31 μm, and 1.33 μm, the insertion loss was 0.8 dB or less, and the isolation was 30 dB or more. The center wavelength selected here is not limited to the above-mentioned value, but can be arbitrarily selected as long as it is in a range satisfying the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band. Is possible. In the case of Example 18, as in the case described in the previous examples, three of the four wavelengths λ1, λ2, λ3, and λ4, two wavelengths, or only one wavelength. There is no problem in operation even if light is incident / exited.

  The specific manufacturing process for the optical multiplexer / demultiplexer according to Embodiment 17 will be described below. First, the holder for the fiber collimators 301, 302, 303, 304, and 305 to be held is processed with respect to the Hastelloy case 312 and fixed to the translucent substrate 311 incorporated in a predetermined place. Marking for roughly positioning the wavelength filters 306, 307, 308, 309 and the mirror 310 by the dielectric multilayer film was applied.

  Prior to the active alignment operation, the wavelength filters 306, 307, 308, and 309 and the mirror 310 fixed to the translucent substrate 311 are positioned and temporarily fixed by a handling jig linked to the micrometer according to the marking. did.

  Next, light of four wavelengths λ1, λ2, λ3, and λ4 is incident as center wavelengths 1.27 μm, 1.29 μm, 1.31 μm, and 1.33 μm from the fiber collimator 301, and fixed to the translucent substrate 311. Alignment work for transmitting and reflecting the wavelength filters 306, 307, 308, 309 and the mirror 310 and coupling them to the fiber collimators 302, 303, 304, 305 was performed. Here, each fiber collimator 301,302,303,304,305, each wavelength filter 306,307,308,309 fixed to the translucent board | substrate 311, and the jig | tool which interlock | cooperated the mirror 310 with the micrometer are used. The alignment was performed so that the coupling efficiency was maximized.

  Although the alignment work here was less than 5 minutes for each of the wavelengths λ1 to λ4, the coupling loss including the fiber collimators 301, 302, 303, 304, and 305 was less than 1 dB. After the alignment operation, the fiber collimators 301, 302, 303, 304, and 305 are made of metal solder, and the wavelength filters 306, 307, 308, and 309 fixed to the light-transmitting substrate 311 and the mirror 310 are UV-cured. It was firmly fixed with an optical adhesive. Incidentally, almost no increase in loss due to this fixing work was observed.

  In this way, the optical multiplexer / demultiplexer according to Example 17 was completed (manufactured). In this optical multiplexer / demultiplexer, wavelength filters 306, 307, 308, 309 and a mirror 310 made of dielectric multilayers that totally reflect a specific wavelength are used. Fiber collimators 301, 302, 303, 304, and 305 can be disposed, and light is spatially coupled within the housing 312. The quantity of the fiber collimators 301, 302, 303, 304, and 305 is By reducing the number of parts, the number of parts can be reduced and the cost can be reduced. In addition, it is not necessary to provide a space for housing the extra length of the fiber in the housing 312 and the parts can be downsized. A high-performance product that simplifies the arrangement of the input / output ports according to the required number of wavelength division multiplexing and can downsize the module It is. The basic configuration of the optical multiplexer / demultiplexer according to the seventeenth embodiment is compatible with four wavelengths. However, the present invention is not limited to this, and in principle, if a wavelength filter and a mirror are appropriately combined, 2 wavelengths, 3 wavelengths, 5 wavelengths, 6 wavelengths, 7 wavelengths, 8 wavelengths, 16 wavelengths, and any number of wavelengths of 2 or more such as 32 wavelengths (indicating that the number of waves can be multiplexed) The present invention can also be applied to a configuration corresponding to the above.

  FIG. 19 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 18 of the present invention.

  In the optical multiplexer / demultiplexer according to the eighteenth embodiment, as an optical wavelength multiplexing communication function, one optical fiber multiplexer / demultiplexer is provided in the vicinity of the outer side on one side of the opposing wall surface in the housing 326 formed to be able to transmit five light beams. It includes one fiber collimator 312 having an input / output port, four fiber collimators 313, 314, 315, 316 each having one input / output port in the vicinity of the other side on the other side, and four different wavelengths λ1, Light of λ2, λ3, and λ4 is separately incident from the four fiber collimators 313, 314, 315, and 316 and multiplexed to one fiber collimator 312 or incident from one fiber collimator 312 and four fiber collimators. It is configured to be able to enter and exit in both directions by demultiplexing to 313, 314, 315 and 316, One transmissive substrate 325 to a constant is used.

  More specifically, in the case of the optical multiplexer / demultiplexer according to the eighteenth embodiment, light having the first wavelength λ1 and the second wavelength λ2 at four different wavelengths λ1, λ2, λ3, and λ4 is transmitted. The first wavelength filter 317 fixed to the light-transmitting substrate 325 that reflects the light of the third wavelength λ3 and the fourth wavelength λ4; the light of the first wavelength λ1; The second wavelength filter 318 fixed to the translucent substrate 325 that reflects light having the wavelength λ2, and the third wavelength filter 319 fixed to the translucent substrate 325 that transmits only the light having the second wavelength λ2. A fourth wavelength filter 320 fixed to a light-transmissive substrate 325 that transmits light of the third wavelength λ3 and reflects light of the fourth wavelength λ4, and only light of the fourth wavelength λ4. A fifth wavelength filter 321 fixed to a light transmitting substrate 325, and a second wavelength λ2. A first mirror 317 fixed to a light-transmitting substrate 325 that totally reflects light, a second mirror 323 that totally reflects light having a third wavelength λ3 and a fourth wavelength λ4, and a fourth wavelength λ4. A third mirror 324 fixed to a translucent substrate 325 that totally reflects the light is provided in the housing 326.

  Furthermore, the first fiber collimator 313 in the one fiber collimator 312 and the four fiber collimators 313, 314, 315, and 316 are substantially linear so that the optical axes of the incoming and outgoing light beams are substantially coincident with each other. The first wavelength filter 317 and the second wavelength filter 318 that are arranged and fixed to the translucent substrate 325 are arranged at predetermined angles on the optical axis and fixed to the translucent substrate 325, respectively. The mirror 322, the second mirror 323, and the third mirror 324 fixed to the translucent substrate 325 include the second fiber collimators 314, 314, 315, and 316, respectively. The fiber collimator 315 has three optical collimators 315 and the fourth fiber collimator 316 has a single optical collimator 312. The light enters and exits the second fiber collimator 314, the third fiber collimator 315, and the fourth fiber collimator 316 so as to be substantially parallel to the optical axis of the light beam coupled to the first fiber collimator 313. A third wavelength filter 319 disposed at a predetermined position at a predetermined angle with respect to the optical axis of the light beam and fixed to the light transmitting substrate 325, and a fourth wavelength filter 320 fixed to the light transmitting substrate 325. , And the fifth wavelength filter 321 fixed to the translucent substrate 325 is disposed at a predetermined angle with respect to each optical axis.

  As a result, the light of the first wavelength λ1 is applied to the first wavelength filter 317 and the translucent substrate 325 fixed to the translucent substrate 325 between one fiber collimator 312 and the first fiber collimator 313. The light having the second wavelength λ 2 is optically coupled through the fixed second wavelength filter 318, and is fixed to the translucent substrate 325 between one fiber collimator 312 and the second fiber collimator 314. The first wavelength filter 317, the second wavelength filter 318 fixed to the light transmitting substrate 325, and the third wavelength filter 319 fixed to the light transmitting substrate 325 and the light transmitting substrate 325 are fixed. The light having the third wavelength λ3 is optically coupled between the first fiber collimator 312 and the third fiber collimator 315. The first wavelength filter 317 fixed to the plate 25 and the fourth wavelength filter 320 fixed to the translucent substrate 325 and the second mirror 323 are optically coupled, and the fourth wavelength λ4 The first wavelength filter 317 fixed to the translucent substrate 325 and the fourth wavelength filter 320 fixed to the translucent substrate 325 between one fiber collimator 312 and the fourth fiber collimator 316 are used. , And a fifth wavelength filter 321 fixed to the translucent substrate 325, and a second mirror 323 and a third mirror 324 are optically coupled.

  The fiber collimators 312, 313, 314, 315, and 316 here are composed of pigtail fibers and lenses, and function as optical signal input / output means. The positions of the pigtail fiber and the lens are arranged at positions where the optical signal becomes collimated light. When the number of wavelength multiplexed signals is four, the necessary optical elements are the wavelength filters 318, 319, 320, and 321 fixed to one side surface of the translucent substrate 325 and the other side surface facing the one side surface. There are five dielectric multilayer films with a wavelength filter 317 fixed to the same, and similarly, two mirrors 322 and 324 fixed to the other side surface of the translucent substrate 325, and the translucent substrate 325. A single mirror 323 is arranged without being fixed to each other. Note that the wavelength filters 317, 318, 319, 320, and 321 each transmit a wavelength within a predetermined range (that is, λ1, λ2, λ3, and λ4, respectively) as in the case of the eighteenth embodiment. And has a wavelength selection characteristic of reflecting the other wavelength range.

  In the case of the demultiplexing operation in this optical multiplexer / demultiplexer, first, the light of wavelengths λ1 and λ2 is selectively selected by the wavelength filter 317 fixed to the translucent substrate 325 with respect to the light of wavelengths λ1 to λ4 incident from the fiber collimator 312. The wavelength filter 318 fixed to the light transmitting substrate 325 is used to transmit the light having the wavelengths λ 1 and λ 2 that is transmitted through the wavelength filter 317, is divided into two wavelengths each by reflection, and is transmitted through the wavelength filter 317. The wavelength filters 317 and 318 and the fiber collimators 312 and 313 are aligned and fixed so that only the light having the wavelength λ1 passes through the wavelength filter 318 and is coupled to the fiber collimator 313. Next, the light of wavelength λ 2 reflected by the wavelength filter 318 fixed to the light-transmitting substrate 325 is reflected by the mirror 322 fixed to the light-transmitting substrate 325 so as to be fixed to the light-transmitting substrate 325. The wavelength filter 319, the mirror 322, and the fiber collimator 314 are aligned and fixed so as to be coupled to the fiber collimator 314 after passing through the wavelength filter 319. Further, the light of the wavelengths λ3 and λ4 reflected by the wavelength filter 317 fixed to the translucent substrate 325 is reflected by the mirror 323 so that only the light of wavelength λ3 is fixed to the translucent substrate 325. The mirror 323, the wavelength filter 320, and the fiber collimator 315 are aligned and fixed so as to pass through the wavelength filter 320 and be coupled to the fiber collimator 315. Finally, the light having the wavelength λ4 reflected by the wavelength filter 320 is reflected by the mirror 324 fixed to the light transmitting substrate 325 so that the light having the wavelength λ4 is fixed to the light transmitting substrate 325. The alignment and fixation of the fiber collimator 316 and the mirror 324 fixed to the translucent substrate 325 and the wavelength filter 321 fixed to the translucent substrate 325 and the fiber collimator 316 so as to pass through the filter 321 and couple to the fiber collimator 316 are performed. Done.

  For this reason, the light of wavelengths λ1 to λ4 incident from the fiber collimator 312 results in that the light of wavelength λ1 is coupled to the fiber collimator 313, the light of wavelength λ2 is coupled to the fiber collimator 314, and the light of wavelength λ3 is coupled to the fiber collimator. The light having the wavelength λ4 is coupled to the fiber collimator 316, and thus the demultiplexing operation is performed.

  On the other hand, in the multiplexing operation, first, the light of wavelength λ 1 incident from the fiber collimator 313 is transmitted through the wavelength filter 318 and the wavelength filter 317 fixed to the translucent substrate 325 so as to be coupled to the fiber collimator 312. In addition, the wavelength filters 317 and 318 fixed to the translucent substrate 325 and the fiber collimators 312 and 313 are aligned and fixed. Next, the light of wavelength λ 2 incident from the fiber collimator 314 passes through the wavelength filter 319 fixed to the light transmitting substrate 325 and is totally reflected so as to be folded back by the mirror 322 fixed to the light transmitting substrate 325. The light is incident on the wavelength filter 318 fixed to the light-transmitting substrate 325, is reflected by the wavelength filter 318, and then passes through the wavelength filter 317 fixed on the light-transmitting substrate 325 with the optical axis coincident with the light of wavelength λ1. Then, the fiber collimator 314 is aligned and fixed with the wavelength filter 319 and the mirror 322 fixed to the translucent substrate 325 so as to be coupled to the fiber collimator 312. Further, the wavelength of the wavelength λ 3 incident from the fiber collimator 315 is transmitted through the wavelength filter 320 fixed to the translucent substrate 325, is totally reflected so as to be folded by the mirror 323, and is fixed to the translucent substrate 325. The wavelength filter 320 and the mirror 323 fixed to the translucent substrate 325 are incident on the filter 317 and further reflected by the wavelength filter 317 so that the optical axis coincides with the light of wavelength λ1 and is coupled to the fiber collimator 312. And fiber collimator 315 are aligned and fixed. Finally, the light of wavelength λ4 incident from the fiber collimator 316 passes through the wavelength filter 321 fixed to the translucent substrate 325, and is totally reflected so as to be folded by the mirror 324 fixed to the translucent substrate 325. The light is incident on the wavelength filter 320 fixed to the light-transmitting substrate 325, is further reflected by the wavelength filter 320, and then is totally reflected so that the light of the wavelength λ3 coincides with the optical axis and is folded again by the mirror 323. The light is incident on the wavelength filter 317 fixed to the light-transmitting substrate 325, is reflected by the wavelength filter 317, and then is fixed to the light-transmitting substrate 325 so that the light of wavelength λ1 coincides with the optical axis and is coupled to the fiber collimator 312. The aligned wavelength filter 321 and mirror 324 and the fiber collimator 316 are aligned and fixed.

  Therefore, the light of wavelength λ1 incident from the fiber collimator 313, the light of wavelength λ2 incident from the fiber collimator 314, the light of wavelength λ3 incident from the fiber collimator 315, and the light of wavelength λ4 incident from the fiber collimator 316 As a result, both are coupled to the fiber collimator 312, and the multiplexing operation is performed in this way.

  Incidentally, in this optical multiplexer / demultiplexer, when only the multiplexing function is simply required or when high isolation is not required for the demultiplexing function, either or both of the wavelength filters 319 and 321 are omitted. You can also

  In addition, about the fiber collimators 313, 314, 315, and 316 here, the aspect arrange | positioned in parallel in the vicinity of the other side of the opposing wall surface of the housing | casing 326 is illustrated, but as each optical element, Light incident / exit angles of the fiber collimators 312, 313, 314, 315 and 316, wavelength filters 317, 318, 319, 320 and 321 fixed to the light-transmitting substrate 325, and mirrors fixed to the light-transmitting substrate 325 322, 324, mirror 323 that is not fixed to the light-transmitting substrate 325, the manufacturing accuracy of the light-transmitting substrate 325, and the mounting accuracy of each optical element with respect to the housing 326 need to be adjusted slightly. Although they may not be parallel, they can be arranged generally parallel.

  In the case of the optical multiplexer / demultiplexer according to the eighteenth embodiment, the center wavelengths of the four wavelengths λ1, λ2, λ3, and λ4 are set to 1.49 μm and 1.51 μm with respect to the light incident from or coupled to the fiber collimator 312. , 1.53 μm and 1.55 μm, the insertion loss was 0.7 dB or less, and the isolation was 30 dB or more. The center wavelength selected here is not limited to the above-mentioned value, but can be arbitrarily selected as long as it is in a range satisfying the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band. Is possible.

  By the way, the specific manufacturing process for the optical multiplexer / demultiplexer according to the eighteenth embodiment is the same as that described in the seventeenth embodiment, and the preferable characteristics (operation effects) of the optical multiplexer / demultiplexer are also the same. The description is omitted. As described in the seventeenth embodiment, the basic configuration of the optical multiplexer / demultiplexer according to the eighteenth embodiment is also compatible with four wavelengths. However, if a wavelength filter and a total reflection mirror are combined, this configuration is limited. In principle, the present invention can be applied to a configuration corresponding to 8 wavelengths (8 wave multiplexing), 16 wavelengths (16 wave multiplexing), and further 32 wavelengths (32 wave multiplexing).

  FIG. 20 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 19 of the present invention.

  The optical multiplexer / demultiplexer according to the nineteenth embodiment has, as an optical wavelength multiplexing communication function, one optical fiber near the outer side on one side of the opposing wall surface in the housing 342 formed to be able to transmit five light beams. It includes one fiber collimator 327 having an input / output port, four fiber collimators 328, 329, 330, 331 each having one input / output port in the vicinity of the other side on the other side, and four different wavelengths λ1, The light of λ2, λ3, and λ4 is separately incident from the four fiber collimators 328, 329, 330, and 331 and multiplexed to one fiber collimator 327, or incident from one fiber collimator 327 and four fiber collimators. 328, 329, 330, and 331 are configured to be able to enter and exit in both directions by demultiplexing, and each optical element is Two light-transmissive substrate 356 and 358 to the constant is used.

  Specifically, in the case of the optical multiplexer / demultiplexer according to the nineteenth embodiment, light having the first wavelength λ1 and the second wavelength λ2 at four different wavelengths λ1, λ2, λ3, and λ4 is transmitted. The first wavelength filter 332 fixed to the first transparent substrate 340, the second transparent substrate 341, which reflects the light of the third wavelength λ3 and the fourth wavelength λ4, and the first The second wavelength filter 333 fixed to the second light-transmissive substrate 341 that transmits the light having the wavelength λ1 and reflects the light having the second wavelength λ2, and transmits only the light having the second wavelength λ2. A third wavelength filter 334 fixed to the second translucent substrate 341, and a second translucent substrate 341 that transmits light of the third wavelength λ3 and reflects light of the fourth wavelength λ4. A fourth wavelength filter 335 fixed to the second transparent substrate 341 that transmits only light having a fourth wavelength λ4. A fifth wavelength filter 336 fixed to the first light transmitting substrate 340, a first light transmitting substrate 340 that totally reflects light having the second wavelength λ2, and a first mirror 337 fixed to the second light transmitting substrate 341, The second mirror 338 fixed to the first translucent substrate 40 that totally reflects the light of the third wavelength λ3 and the fourth wavelength λ4, and the first that totally reflects the light of the fourth wavelength λ4. The light-transmitting substrate 340 and the third mirror 339 fixed to the second light-transmitting substrate 341 are provided in the housing 342.

  Further, the one fiber collimator 327 and the first fiber collimator 328 in the four fiber collimators 328, 329, 330, and 331 are substantially in a straight line so that the optical axes of the incoming and outgoing light beams substantially coincide with each other. The first wavelength filter 332 and the second wavelength filter 333 fixed to the second light transmitting substrate 341 are arranged and fixed to the first light transmitting substrate 340, the second light transmitting substrate 341, and the second wavelength filter 333. The first light-transmitting substrate 340, the first mirror 337 fixed to the second light-transmitting substrate 341, and the first light-transmitting substrate 340 are fixed on the optical axis, respectively. The second mirror 338, the first light transmitting substrate 340, and the third mirror 339 fixed to the second light transmitting substrate 341 are attached to the four fiber collimators 328, 329, 330, and 331, respectively. The light beams of the light beams entering and exiting the second fiber collimator 329, the third fiber collimator 330, and the fourth fiber collimator 331 are combined from one fiber collimator 327 to the first fiber collimator 328. A predetermined angle at a predetermined angle with respect to the optical axis of light entering and exiting the second fiber collimator 329, the third fiber collimator 330, and the fourth fiber collimator 331 so as to be substantially parallel to the axis. The third wavelength filter 334, the fourth wavelength filter 335, and the fifth wavelength filter 336, which are arranged at positions and are all fixed to the second light-transmitting substrate 341, are respectively in each optical axis. They are arranged at a predetermined angle.

  As a result, the light having the first wavelength λ1 is fixed to the first light transmitting substrate 340 and the second light transmitting substrate 341 between the one fiber collimator 327 and the first fiber collimator 328. The first wavelength filter 332 and the second wavelength filter 333 fixed to the second translucent substrate 341 are optically coupled, and the light of the second wavelength λ2 is transmitted to one fiber collimator 327 and the first wavelength collimator 327. The first wavelength filter 332 fixed to the first light transmitting substrate 340 and the second light transmitting substrate 341 between the second fiber collimator 329 and the second light transmitting substrate 341 fixed to the second light transmitting substrate 341. The second wavelength filter 33, the third wavelength filter 334 fixed to the second light transmitting substrate 341, the first light transmitting substrate 340, and the first light transmitting substrate 341 fixed to the first light transmitting substrate 341. Light through mirror 331 The light having the third wavelength λ3 is fixed to the first light-transmitting substrate 340 and the second light-transmitting substrate 341 between one fiber collimator 327 and the third fiber collimator 330. The first wavelength filter 332, the fourth wavelength filter 335 fixed to the second light transmitting substrate 341, and the second mirror 338 fixed to the first light transmitting substrate 340. Optically coupled and the light of the fourth wavelength λ4 is fixed to the first light transmitting substrate 340 and the second light transmitting substrate 341 between one fiber collimator 327 and the fourth fiber collimator 331. The first wavelength filter 332, the fourth wavelength filter 335 fixed to the second light transmitting substrate 341, and the fifth wavelength filter 336 fixed to the second light transmitting substrate 341 and the first wavelength filter 336 On the translucent substrate 340 The second mirror 338 and the first transparent substrate 340 fixed to each other and the third mirror 339 fixed to the second transparent substrate 341 are optically coupled. .

  The fiber collimators 327, 328, 329, 330, and 331 here are made up of pigtail fibers and lenses, and function as optical signal input / output means. The positions of the pigtail fiber and the lens are arranged at positions where the optical signal becomes collimated light. When the number of wavelength multiplexed signals is four, the necessary optical elements are the first light-transmitting substrate 340 and the wavelength filter 332 fixed to the second light-transmitting substrate 341 and the second light-transmitting plate opposite thereto. There are five dielectric multilayer films including wavelength filters 333, 334, 335, and 336 fixed to the side surface of the optical substrate 341. Similarly, the first and second translucent substrates 340 and 340 are provided. There are three mirrors 337 and 339 fixed to the transparent substrate 341 and three mirrors 338 fixed to the side surface of the first light-transmitting substrate 340 facing the mirrors 337 and 339. Note that the wavelength filters 332, 333, 334, 335, and 336 transmit the wavelengths in a predetermined range (that is, λ1, λ2, λ3, and λ4, respectively) as in the case of the eighteenth embodiment. And has a wavelength selection characteristic of reflecting the other wavelength range.

  In the case of the demultiplexing operation in this optical multiplexer / demultiplexer, first, the wavelengths fixed to the first translucent substrate 340 and the second translucent substrate 341 with respect to the light of wavelengths λ1 to λ4 incident from the fiber collimator 327. The light of wavelengths λ1 and λ2 is selectively transmitted by the filter 332, the light of wavelengths λ3 and λ4 is reflected and divided into two wavelengths, and the light of wavelengths λ1 and λ2 transmitted through the wavelength filter 332 is The wavelength filters 332 and 333 and the fiber collimators 327 and 328 so that only the light having the wavelength λ1 is transmitted through the wavelength filter 333 and coupled to the fiber collimator 328 by the wavelength filter 333 fixed to the second transparent substrate 341. Alignment and fixing are performed. Next, the light of wavelength λ 2 reflected by the wavelength filter 333 fixed to the second light transmitting substrate 341 is reflected by the first light transmitting substrate 340 and the mirror 337 fixed to the second light transmitting substrate 341. The wavelength filter 334, the mirror 337, and the fiber collimator 329 are aligned so as to be folded and reflected and transmitted through the wavelength filter 334 fixed to the second light-transmissive substrate 341 and then coupled to the fiber collimator 329. Fixing is performed. Further, the light having the wavelengths λ3 and λ4 reflected by the wavelength filter 332 fixed to the first light-transmitting substrate 340 and the second light-transmitting substrate 341 was fixed to the first light-transmitting substrate 340. The mirror 338 and the wavelength filter 335 are reflected so as to be folded by the mirror 338 so that only the light having the wavelength λ3 is transmitted through the wavelength filter 335 fixed to the second light transmitting substrate 341 and coupled to the fiber collimator 330. And fiber collimator 330 are aligned and fixed. Finally, the light having the wavelength λ4 reflected by the wavelength filter 335 is reflected by the mirror 339 fixed to the first light transmitting substrate 340 and the second light transmitting substrate 341 and reflected by the wavelength λ4. It is fixed to the first light transmitting substrate 340 and the second light transmitting substrate 341 so that the light passes through the wavelength filter 336 fixed to the second light transmitting substrate 341 and is coupled to the fiber collimator 331. The wavelength filter 336 and the fiber collimator 331 fixed to the mirror 339 and the second translucent substrate 341 are aligned and fixed.

  For this reason, the light of wavelengths λ1 to λ4 incident from the fiber collimator 327 results in that the light of wavelength λ1 is coupled to the fiber collimator 328, the light of wavelength λ2 is coupled to the fiber collimator 329, and the light of wavelength λ3 is coupled to the fiber collimator. The light having the wavelength λ4 is coupled to the fiber collimator 331, and thus the demultiplexing operation is performed.

  On the other hand, in the case of the multiplexing operation, first, the light having the wavelength λ1 incident from the fiber collimator 328 is fixed to the second light transmitting substrate 41, the first light transmitting substrate 340, the second light transmitting substrate 340, and the second light transmitting substrate 340. The wavelength filter 333 fixed to the first light transmitting substrate 340 and the second light transmitting substrate 341 so as to pass through the wavelength filter 332 fixed to the light transmitting substrate 341 and to be coupled to the fiber collimator 327. Then, the wavelength filter 333 fixed to the second translucent substrate 341 and the fiber collimators 327 and 328 are aligned and fixed. Next, light having a wavelength λ 2 incident from the fiber collimator 329 passes through the wavelength filter 334 fixed to the second light-transmitting substrate 341, and the first light-transmitting substrate 340 and the second light-transmitting substrate 341 are transmitted. The light is totally reflected so as to be folded by the mirror 337 fixed to the light, enters the wavelength filter 333 fixed to the second light-transmitting substrate 341, and further reflected by the wavelength filter 333, and then the light having the wavelength λ1 and the optical axis Are transmitted through the wavelength filter 332 fixed to the first light transmitting substrate 340 and the second light transmitting substrate 341 and coupled to the fiber collimator 327 so that the second light transmitting substrate 341 has the same. The fixed wavelength filter 334 and mirror 337 and the fiber collimator 329 are aligned and fixed. Further, the light having the wavelength λ 3 incident from the fiber collimator 330 passes through the wavelength filter 335 fixed to the second light transmitting substrate 41 and is folded by the mirror 338 fixed to the first light transmitting substrate 340. Is incident on the wavelength filter 332 fixed to the first and second light-transmitting substrates 340 and 341 and further reflected by the wavelength filter 332, and then the light having the wavelength λ 1 and the optical axis are reflected. The alignment and fixation of the fiber collimator 330 and the wavelength filter 335 fixed to the translucent substrate 41, the mirror 338 fixed to the first translucent substrate 340, and the fiber collimator 330 are performed so as to be coupled to the fiber collimator 327. Done. Finally, light having a wavelength λ4 incident from the fiber collimator 331 passes through the wavelength filter 336 fixed to the second light transmitting substrate 341, and the first light transmitting substrate 340 and the second light transmitting substrate 341 are transmitted. The light is totally reflected so as to be folded by the mirror 339 fixed to the light, enters the wavelength filter 335 fixed to the second light-transmitting substrate 341, and further reflected by the wavelength filter 335, and then the light having the wavelength λ3 and the optical axis Are the wavelengths that are totally reflected so as to be folded back by a mirror 338 fixed to the first light-transmitting substrate 340 and fixed to the first light-transmitting substrate 340 and the second light-transmitting substrate 341. The wavelength fixed to the second light-transmitting substrate 341 so that the light having the wavelength λ1 coincides with the optical axis and is coupled to the fiber collimator 327 after being incident on the filter 332 and reflected by the wavelength filter 332. Filter 336 and the mirror 339 and the fiber collimator 331 concert centering and fixation is performed.

  For this reason, the light of wavelength λ1 incident from the fiber collimator 328, the light of wavelength λ2 incident from the fiber collimator 329, the light of wavelength λ3 incident from the fiber collimator 330, and the light of wavelength λ4 incident from the fiber collimator 331 As a result, both are coupled to the fiber collimator 327, and the multiplexing operation is thus performed.

  Incidentally, in this optical multiplexer / demultiplexer, when only the multiplexing function is required or when high isolation is not required for the demultiplexing function, either or both of the wavelength filters 333 and 335 are omitted. You can also

  The fiber collimators 328, 329, 330, and 331 here are illustrated as being arranged in parallel in the vicinity of the other side of the opposing wall surface of the housing 342. Light incident / exit angles of the fiber collimators 327, 328, 329, 330, and 331, the first light transmitting substrate 340, the wavelength filter 332 fixed to the second light transmitting substrate 341, and the second light transmitting substrate Each of the wavelength filters 333, 334, 335, 336 fixed to the 341, the first light transmitting substrate 340, the mirrors 337, 339 fixed to the second light transmitting substrate 341, and the first light transmitting substrate 340. It is necessary to make some adjustments depending on the manufacturing accuracy of the first light transmitting substrate 340, the second light transmitting substrate 340, and the mounting accuracy of each optical element to the housing 342. The full because there is a possibility that not to parallel, but can be generally parallel.

  In the case of the optical multiplexer / demultiplexer according to the nineteenth embodiment, the center wavelengths of the four wavelengths λ1, λ2, λ3, and λ4 are set to 1.49 μm and 1.51 μm for the light incident from or coupled to the fiber collimator 327. , 1.53 μm and 1.55 μm, the insertion loss was 0.8 dB or less, and the isolation was 30 dB or more. The center wavelength selected here is not limited to the above-mentioned value, but can be arbitrarily selected as long as it is in a range satisfying the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band. Is possible.

  By the way, the specific manufacturing process for the optical multiplexer / demultiplexer according to the nineteenth embodiment is the same as that described in the seventeenth embodiment, and the preferable characteristics (operation effects) of the optical multiplexer / demultiplexer are also the same. The description is omitted. Further, as described in the seventeenth embodiment, the basic configuration of the optical multiplexer / demultiplexer according to the nineteenth embodiment is also compatible with four wavelengths, but is limited to this configuration by combining a wavelength filter and a total reflection mirror. In principle, the present invention can be applied to a configuration corresponding to 8 wavelengths (8 wave multiplexing), 16 wavelengths (16 wave multiplexing), and further 32 wavelengths (32 wave multiplexing).

  FIG. 21 is a schematic diagram showing a basic configuration (overall configuration) of an optical multiplexer / demultiplexer according to Embodiment 20 of the present invention.

  The optical multiplexer / demultiplexer according to the twentieth example has one optical multiplexer / demultiplexer function in the vicinity of the outer side on one side of the opposing wall surface in the housing 359 formed so as to be able to transmit five light beams. It includes one fiber collimator 343 having an input / output port, four fiber collimators 344, 345, 346, 347 each having one input / output port in the vicinity of the other side on the other side, and four different wavelengths λ1, Lights of λ2, λ3, and λ4 are separately incident from the four fiber collimators 344, 345, 346, and 347 and multiplexed to one fiber collimator 343, or incident from one fiber collimator 343 and four fiber collimators. 344, 345, 346, and 347 are configured to be able to enter and exit in both directions, and each optical element is Three sheets of the transparent substrate 356,357,358 is used to constant.

  Specifically, in the case of the optical multiplexer / demultiplexer according to the twentieth embodiment, light having the first wavelength λ1 and the second wavelength λ2 at four different wavelengths λ1, λ2, λ3, and λ4 is transmitted. The first wavelength filter 348 fixed to the first light transmitting substrate 356 and the second light transmitting substrate 358 that reflect the light of the third wavelength λ3 and the fourth wavelength λ4, The second wavelength filter 349 fixed to the second light-transmitting substrate 358 that transmits the light having the wavelength λ1 and reflects the light having the second wavelength λ2, and transmits only the light having the second wavelength λ2. A third wavelength filter 351 fixed to the second translucent substrate 358, and a second translucent substrate 358 that transmits light of the third wavelength λ3 and reflects light of the fourth wavelength λ4. And a second translucent substrate 358 that transmits only light of the fourth wavelength λ4. A fifth wavelength filter 352 fixed to the first mirror, a first mirror 354 fixed to the first translucent substrate 356 that totally reflects the light of the second wavelength λ2, the third wavelength λ3 and the fourth wavelength The second mirror 353 fixed to the first translucent substrate 356 that totally reflects the light having the wavelength λ4 and the first translucent substrate 356 that totally reflects the light having the fourth wavelength λ4. In addition, a third mirror 355 and a third light-transmitting substrate 357 that fixes the first light-transmitting substrate 356 and the second light-transmitting substrate 358 are provided in the housing 359.

  Furthermore, one fiber collimator 343 and the first fiber collimator 344 in the four fiber collimators 344, 345, 346, and 347 are substantially linear so that the optical axes of the incoming and outgoing light beams substantially coincide with each other. The first wavelength filter 348 disposed and fixed to the first light transmitting substrate 356 and the second light transmitting substrate 358 and the second wavelength filter 349 fixed to the second light transmitting substrate 358 are provided. The first mirror 354, the second mirror 353, and the third mirror 355, which are arranged on the optical axis at a predetermined angle and fixed to the first light-transmitting substrate 356, are composed of four fiber collimators 344. , 345, 346, and 347, the light that enters and exits the second fiber collimator 345, the third fiber collimator 346, and the fourth fiber collimator 347. The second fiber collimator 345, the third fiber collimator 346, and the second fiber collimator 346 so that their optical axes are substantially parallel to the optical axis of the light beam coupled from one fiber collimator 343 to the first fiber collimator 344. The third wavelength filter 351 and the second wavelength filter 351 are arranged at predetermined positions at predetermined angles with respect to the optical axes of the light beams entering and exiting the fourth fiber collimator 347 and fixed to the second light transmitting substrate 358. The fourth wavelength filter 350 fixed to the translucent substrate 358 and the fifth wavelength filter 352 fixed to the second translucent substrate 358 are arranged at predetermined angles with respect to the respective optical axes. Has been.

  Thereby, the light of the first wavelength λ1 is fixed to the first light transmitting substrate 356 and the second light transmitting substrate 358 between the one fiber collimator 343 and the first fiber collimator 344. The first wavelength filter 348 and the second wavelength filter 349 fixed to the second translucent substrate 358 are optically coupled, and the light of the second wavelength λ 2 is transmitted to one fiber collimator 343 and The first wavelength filter 348 fixed to the first light-transmitting substrate 356 and the second light-transmitting substrate 358 between the two fiber collimators 345 and the second wavelength fixed to the light-transmitting substrate 358. Optically coupled through a filter 349 and a third wavelength filter 351 fixed to the second light transmitting substrate 358 and a first mirror 354 fixed to the first light transmitting substrate 356, Third wavelength λ The first wavelength filter 348 fixed to the first and second transparent substrates 356 and 358 between the one fiber collimator 343 and the third fiber collimator 346, and the first wavelength filter 348 Optically coupled through a fourth wavelength filter 350 fixed to the second translucent substrate 358 and a second mirror 353 fixed to the first translucent substrate 356, and a fourth wavelength λ4. Of the first wavelength filter 348 and the second wavelength filter 348 fixed to the first and second translucent substrates 356 and 358 between one fiber collimator 343 and the fourth fiber collimator 347. The fourth wavelength filter 350 fixed to the transparent substrate 358, the fifth wavelength filter 352 fixed to the second transparent substrate 358, and the first wavelength filter 356 fixed to the first transparent substrate 356. Two mirrors 353 And a third mirror 355 fixed to the first light transmitting substrate 356 are optically coupled.

  The fiber collimators 343, 344, 345, 346, and 347 here are composed of pigtail fibers and lenses, and function as optical signal input / output means. The positions of the pigtail fiber and the lens are arranged at positions where the optical signal becomes collimated light. When the number of wavelength multiplexed signals is four, the necessary optical elements are the first light-transmitting substrate 356 and the second light-transmitting substrate 358, and the wavelength filter 348 fixed to the second light-transmitting substrate 358 and the second light-transmitting substrate opposite thereto. There are five dielectric multilayer films of wavelength filters 349, 350, 351, and 352 fixed to the side surface of the optical substrate 358, and the side surface of the first transparent substrate 356 facing the wavelength filter 348. There are three mirrors 353, 354, and 355 fixed to.

  The wavelength filters 348, 349, 350, 351, and 352 transmit characteristics within a predetermined range (that is, λ 1, λ 2, λ 3, and λ 4, respectively) as in the case of the eighteenth embodiment. And has a wavelength selection characteristic of reflecting the other wavelength range.

  In the case of the demultiplexing operation in this optical multiplexer / demultiplexer, first, with respect to light having wavelengths λ1 to λ4 incident from the fiber collimator 343, the wavelength filter 348 fixed to the translucent substrate 356 and the second translucent substrate 358 is used. The light of wavelengths λ1 and λ2 that selectively transmits the light of wavelengths λ1 and λ2, reflects the light of wavelengths λ3 and λ4, divides the light into two wavelengths, and transmits the light of wavelengths λ1 and λ2 that passes through the wavelength filter 348. The wavelength filters 348 and 349 and the fiber collimators 343 and 344 are aligned so that only the light having the wavelength λ1 passes through the wavelength filter 349 and is coupled to the fiber collimator 344 by the wavelength filter 349 fixed to the optical substrate 358. Fixing is performed. Next, the light having the wavelength λ 2 reflected by the wavelength filter 349 fixed to the second light-transmitting substrate 358 is reflected by the mirror 354 fixed to the first light-transmitting substrate 356 so that the second light is reflected. The wavelength filter 351, the mirror 354, and the fiber collimator 346 are aligned and fixed so as to be coupled to the fiber collimator 346 after passing through the wavelength filter 351 fixed to the transparent substrate 358. Further, with respect to light having wavelengths λ 3 and λ 4 reflected by the wavelength filter 348 fixed to the light transmitting substrate 356 and the second light transmitting substrate 358, the light is reflected by the mirror 353 fixed to the first light transmitting substrate 356. The mirror 353, the wavelength filter 350, and the fiber collimator are reflected so that only the light having the wavelength λ 3 is reflected and passes through the wavelength filter 350 fixed to the second translucent substrate 358 and is coupled to the fiber collimator 345. Alignment / fixation with 345 is performed. Finally, the light of wavelength λ4 reflected by the wavelength filter 350 fixed to the second light transmitting substrate 358 is reflected so as to be folded by the mirror 355 fixed to the first light transmitting substrate 356. A mirror 355 fixed to the first light transmitting substrate 356 and the second light so that the light of wavelength λ4 passes through the wavelength filter 352 fixed to the second light transmitting substrate 358 and is coupled to the fiber collimator 347. The wavelength filter 352 fixed to the translucent substrate 358 and the fiber collimator 347 are aligned and fixed. Note that the third light transmitting substrate 357 is used for fixing the second light transmitting substrate 356 and the second light transmitting substrate 358.

  For this reason, the light having the wavelengths λ1 to λ4 incident from the fiber collimator 343 results in that the light having the wavelength λ1 is coupled to the fiber collimator 344, the light having the wavelength λ2 is coupled to the fiber collimator 345, and the light having the wavelength λ3 is coupled to the fiber collimator. The light having the wavelength λ4 is coupled to the fiber collimator 347, and thus the demultiplexing operation is performed.

  On the other hand, in the case of the multiplexing operation, first, the light having the wavelength λ1 incident from the fiber collimator 344 is fixed to the second light transmitting substrate 358, the wavelength filter 349, the light transmitting substrate 356, and the second light transmitting property. The light transmitting substrate 356 and the wavelength filter 348 fixed to the second light transmitting substrate 358 and the second light transmitting light so as to pass through the wavelength filter 348 fixed to the substrate 358 and couple to the fiber collimator 343. The wavelength filter 349 fixed to the conductive substrate 358 and the fiber collimators 343 and 344 are aligned and fixed. Next, the light of wavelength λ 2 incident from the fiber collimator 346 passes through the wavelength filter 351 fixed to the second light transmitting substrate 358 and is folded by the mirror 354 fixed to the first light transmitting substrate 356. In this way, the light is totally reflected and incident on the wavelength filter 349 fixed to the second light transmitting substrate 358, and after being reflected by the wavelength filter 349, the light axis of the wavelength λ1 coincides with the optical axis so that the light transmitting substrate 356 , Wavelength filters 349 and 351 fixed to the second light-transmitting substrate 358 and the first filter so as to pass through the wavelength filter 348 fixed to the second light-transmitting substrate 358 and to be coupled to the fiber collimator 343. The mirror 354 and the fiber collimator 346 fixed to the translucent substrate 356 are aligned and fixed. Further, the light of wavelength λ 3 incident from the fiber collimator 345 passes through the wavelength filter 350 fixed to the second light transmitting substrate 358 and is folded back by the mirror 353 fixed to the first light transmitting substrate 356. Is incident on the wavelength filter 348 fixed to the light-transmitting substrate 356 and the second light-transmitting substrate 358 and further reflected by the wavelength filter 348 so that the light axis of the wavelength λ1 coincides with the optical axis. The alignment and fixing of the fiber collimator 345 with the wavelength filter 350 fixed to the second light transmitting substrate 358, the mirror 353 fixed to the first light transmitting substrate 356, and the fiber collimator 345 so as to be coupled to the fiber collimator 343 is performed. Done. Finally, the light of wavelength λ4 incident from the fiber collimator 347 passes through the wavelength filter 352 fixed to the second light transmitting substrate 358 and is folded by the mirror 355 fixed to the first light transmitting substrate 356. In this way, the light is totally reflected and incident on the wavelength filter 350 fixed to the second light-transmitting substrate 358, and further reflected by the wavelength filter 350. The light is totally reflected so as to be folded back by a mirror 353 fixed to the optical substrate 356 and is incident on the wavelength filter 348 fixed to the light transmitting substrate 356 and the second light transmitting substrate 358, and is reflected by the wavelength filter 348. After that, the wavelength filter 352 fixed to the second translucent substrate 358 and the first translucent substrate so that the optical axis coincides with the light of the wavelength λ1 and is coupled to the fiber collimator 343. 356 fixed mirror 355 and the fiber collimator 347 concert aligning and fixing in is performed.

  For this reason, the light of wavelength λ1 incident from the fiber collimator 344, the light of wavelength λ2 incident from the fiber collimator 345, the light of wavelength λ3 incident from the fiber collimator 346, and the light of wavelength λ4 incident from the fiber collimator 347 As a result, both are coupled to the fiber collimator 343, and the multiplexing operation is thus performed.

  Incidentally, in this optical multiplexer / demultiplexer, when only the multiplexing function is required or when high isolation is not required for the demultiplexing function, either or both of the wavelength filters 350 and 352 are omitted. You can also

  The fiber collimators 344, 345, 346, and 347 here are illustrated as being arranged almost in parallel in the vicinity of the other side of the opposite wall surface of the housing 359, but Light incident / exit angles of the fiber collimators 343, 344, 345, 346, 347, the wavelength filter 348 fixed to the first light transmitting substrate 356, the second light transmitting substrate 358, and the second light transmitting substrate Wavelength filters 349, 350, 351, 352 fixed to 358, mirrors 353, 354, 355 fixed to the first light transmitting substrate 340, first light transmitting substrate 356, second light transmitting Since it is necessary to make some adjustments depending on the manufacturing accuracy of the conductive substrate 358 and the third light-transmitting substrate 357 and the mounting accuracy of each optical element with respect to the housing 359, it must not be completely parallel. It may, but can be generally parallel.

  In the case of the optical multiplexer / demultiplexer according to the twentieth embodiment, the center wavelengths of the four wavelengths λ1, λ2, λ3, and λ4 are set to 1.49 μm and 1.51 μm for the light incident from or coupled to the fiber collimator 343. , 1.53 μm and 1.55 μm, the insertion loss was 0.8 dB or less, and the isolation was 30 dB or more. The center wavelength selected here is not limited to the above-mentioned value, but can be arbitrarily selected as long as it is in a range satisfying the propagation condition in the single mode from the 1.3 μm band to the 1.6 μm band. Is possible.

  By the way, the specific manufacturing process for the optical multiplexer / demultiplexer according to the twentieth embodiment is the same as that described in the seventeenth embodiment, and the preferable characteristics (effects) of the optical multiplexer / demultiplexer are also the same. The description is omitted. Further, as described in the seventeenth embodiment, the basic configuration of the optical multiplexer / demultiplexer according to the twentieth embodiment is also compatible with four wavelengths. However, the present invention is not limited to this, and the wavelength filter and the entire configuration are also limited. If the reflecting mirrors are appropriately combined, in principle, any number of wavelengths of 2 or more such as 2 wavelengths, 3 wavelengths, 5 wavelengths, 6 wavelengths, 7 wavelengths, 8 wavelengths, 16 wavelengths, or even 32 wavelengths (the number of them) It can also be applied to a configuration corresponding to (which indicates that wave multiplexing is possible).

  The optical module of the present invention can construct an optical module of four or more wave multiplexing, and can perform optical communication with high speed and large capacity in a metro access system, so that an optical access network for subscribers can be easily provided. Can be realized at low cost. Further, the optical multiplexer / demultiplexer of the present invention simply increases the number of wavelength filters, or by combining a plurality of configurations for 2-wave multiplexing or 4-wave multiplexing, for example, 8-wave multiplexing, or The present invention can also be applied as an optical multiplexer / demultiplexer for multiplex communication of 6 waves or more such as 16 wave multiplex. Furthermore, it can be applied as a high-density wavelength division multiplexing (DWDM) optical multiplexer / demultiplexer having a very narrow wavelength interval by appropriately combining wavelength filters using dielectric multilayer films.

It is the schematic which showed the basic composition of the optical module which concerns on Example 1 of this invention. It is the schematic which showed the basic composition of the optical module which concerns on Example 2 of this invention. It is the schematic which showed the basic composition of the optical module which concerns on Example 3 of this invention. It is the schematic which showed the basic composition of the optical module which concerns on Example 4 of this invention. It is the schematic which showed the basic composition of the optical module which concerns on Example 5 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 6 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer based on Example 7 of this invention. It is the schematic which shows the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 8 of this invention. It is the schematic which shows the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 9 of this invention. It is the schematic which shows the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 10 of this invention. It is the schematic which shows the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 11 of this invention. It is the schematic which shows the basic composition (whole structure) of the optical multiplexing / demultiplexing unit which concerns on Example 12 of this invention. It is the schematic which shows the basic composition (whole structure) of the optical multiplexing / demultiplexing unit which concerns on Example 13 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer based on Example 14 of this invention. The wavelength selection characteristic of the wavelength filter used for the optical multiplexer / demultiplexer shown in FIG. 14 is shown by the relationship of the transmittance | permeability with respect to a wavelength. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 15 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 16 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer based on Example 17 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer based on Example 18 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer based on Example 19 of this invention. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer which concerns on Example 20 of this invention. It is the schematic which showed the basic composition of the conventional microoptics type optical transmitter-receiver module. It is the schematic which showed the basic composition (whole structure) of the optical multiplexer / demultiplexer of a prior art. It is the schematic which shows the basic composition (whole structure) of the conventional optical multiplexer / demultiplexer.

Explanation of symbols

1,15,31,51,81,120,148,196,203,210,223-225,256,281,297,312,326,342,359,470,577 Housing 2,16,32,33 , 52 to 55, 82 to 85, 471 Laser diode 3, 4, 17, 18, 472 Photodiode 5, 19, 34, 56, 86, 121 to 125, 138 to 142, 151, 152, 153 to 156, 171 , 172, 173 to 176, 197 to 202, 204 to 209, 211 to 216, 226 to 231, 232, 233 to 241, 251 to 253, 268 to 272, 282 to 288, 301 to 305, 312 to 316, 327 -331,343-347,473,499-501,578-580 Fiber collimator 6,7,22 23, 35, 57, 59, 61, 87, 89, 90 Total reflection wavelength filter 8, 9, 20, 21, 36, 58, 60, 62, 88, 91, 92, 474 Wavelength separation filter 10, 24 , 37, 39, 63, 65, 67, 69, 93, 95, 97, 99, 476 Condensing lens 11, 12, 25, 26 Coupled lens 13, 27, 38, 40, 64, 66, 68, 70, 94, 96, 98, 100, 475 Collimator lens 14, 28, 41, 42, 71-74, 101-104 Capillary 105 Optical isolator 126-130, 143-146, 157-162, 177-181, 254, 273 277, 289 to 295, 306 to 309, 317 to 321, 332 to 336, 348 to 352, 498, 581, 582 Wavelength filter 13 ～133,147,163～166,182,255,278～280,296,310,322～324,337～339,353～355 mirror 311,325,340,341,356～358 light-transmissive substrate

Claims (46)

  Each housing has at least one laser diode, an optical lens, a wavelength filter, and a fiber collimator, and the optical lens for light emitted from the laser diode is transmitted through the housing. In the optical module having a function of coupling the optical collimator to the fiber collimator through the wavelength filter in free space, the optical lens includes a condenser lens that condenses light emitted from the laser diode, and the laser diode. A collimator lens that collimates the emitted light, and a fiber that collects the light emitted from the laser diode by the condenser lens is built in between the condenser lens and the collimator lens. And a capillary having both end surfaces polished, and the collimator lens is Optical module, characterized in that the light emitted from the fiber Yapirari parallel light.   2. The optical module according to claim 1, wherein the wavelength filter reflects the wavelength of the parallel light emitted from the collimator lens laser so that the light beam direction can be changed at least twice in the housing. 3. An optical module characterized in that at least one of them is arranged so that the parallel light can be incident at a predetermined incident angle.   3. The optical module according to claim 1, wherein the wavelength filter is made of a dielectric multilayer film.   4. The optical module according to claim 1, wherein an optical isolator having a dedicated wavelength is added to the laser diode in accordance with a transmission speed.   5. The optical module according to claim 1, wherein light transmitted or totally reflected by the wavelength filter is directed only to the fiber collimator side between the wavelength filter and the fiber collimator. And an optical isolator corresponding to the entire wavelength range of the laser diode used.   Each housing has at least one photodiode, an optical lens, a wavelength filter, and a fiber collimator, and the parallel light incident from the fiber collimator is passed through the wavelength filter in the housing. In the optical module having a function of coupling with the photodiode in free space by transmitting the optical lens, the wavelength filter totally reflects the wavelength of the parallel light incident from the fiber collimator and So that the light direction can be changed at least twice, at least two or more are arranged so that the parallel light can be incident at a predetermined incident angle, and the optical lens is formed by the wavelength filter. Including a coupling lens for coupling the totally reflected parallel light to the photodiode. Optical module and butterflies.   7. The optical module according to claim 6, wherein the wavelength filter is made of a dielectric multilayer film.   Each case has at least one laser diode, photodiode, optical lens, wavelength filter, and fiber collimator in the case, and passes through the optical lens for light emitted from the laser diode in the case. A function of coupling the optical collimator to the fiber collimator through the wavelength filter in free space, and the optical lens through the wavelength filter for parallel light incident from the fiber collimator in the housing. In the optical module having a function of coupling to the photodiode in a free space by transmitting the optical lens, the optical lens is emitted from the laser diode and a condenser lens that collects the light emitted from the laser diode. A collimator lens that converts the light to be collimated into Between the collimator lenses, there is a built-in fiber that collects the light emitted from the laser diode by the condensing lens, and both ends of the capillary are polished, and the collimator lens includes the capillary The light emitted from the fiber is parallel light, and the wavelength filter includes at least a wavelength of the parallel light emitted from the collimator lens laser and a wavelength of the parallel light incident from the fiber collimator. At least two or more are arranged so that the parallel light can be incident at a predetermined incident angle so that one side can be totally reflected and the light beam direction can be changed at least twice in the housing. The optical lens is configured to couple the parallel light reflected by the wavelength filter to the photodiode. Optical module characterized in that it comprises a lens.   9. The optical module according to claim 8, wherein the wavelength filter is made of a dielectric multilayer film.   10. The optical module according to claim 8, wherein an optical isolator having a dedicated wavelength is added to the laser diode in accordance with a transmission speed.   A housing having first and second side surfaces facing each other, a first input / output port disposed on the first side surface of the housing, and disposed on the second side surface of the housing The second input / output port to the fifth input / output port are provided, and the first input / output port receives optical signals having a wavelength group composed of different first to fourth wavelengths. The second input / output port through the fifth input / output port input / output the optical signals having the first wavelength through the fourth wavelength, respectively. The housing transmits the optical signal having the first wavelength incident from the first input / output port toward the second input / output port, and transmits the second input / output port. An optical signal having the first wavelength incident from a port is directed to the first input / output port The first light transmitting means for transmitting and the optical signal having the second wavelength incident from the first input / output port are transmitted to the third input / output port, and the third input / output port Second optical transmission means for transmitting an optical signal having the second wavelength incident from the port toward the first input / output port; and the third wavelength incident from the first input / output port. And transmitting the optical signal having the third wavelength incident from the fourth input / output port toward the first input / output port. A third light transmission means and an optical signal having the fourth wavelength incident from the first incident / exit port are transmitted toward the fifth incident / exit port, and from the fifth incident / exit port The incident optical signal having the fourth wavelength is directed to the first input / output port. Demultiplexer, characterized in that a fourth light transmitting means for transmitting Te.   12. The optical multiplexer / demultiplexer according to claim 11, wherein the first light transmission means is disposed between the first side surface and the second side surface in the housing, and A first wavelength filter that transmits an optical signal having the second wavelength and the second wavelength and reflects an optical signal having the third wavelength and the fourth wavelength, and the vicinity of the second input / output port The second is disposed between the first wavelength filter and the second side surface, transmits an optical signal having the first wavelength, and reflects an optical signal having the second wavelength. An optical multiplexer / demultiplexer comprising:   13. The optical multiplexer / demultiplexer according to claim 12, wherein the second light transmission means is disposed in the vicinity of the first wavelength filter, the second wavelength filter, and the third input / output port. A third wavelength filter that transmits only an optical signal having the second wavelength, and an optical signal having the second wavelength reflected by the second wavelength filter is directed toward the third wavelength filter. Reflecting and reflecting the optical signal having the second wavelength that has entered the housing from the third input / output port and transmitted through the third wavelength filter toward the second wavelength filter. And an optical multiplexer / demultiplexer.   14. The optical multiplexer / demultiplexer according to claim 13, wherein the third optical transmission means is disposed in the vicinity of the first wavelength filter and the fourth input / output port and has the third wavelength. A fourth wavelength filter that transmits an optical signal and reflects an optical signal having the fourth wavelength; and a first wavelength filter disposed on the first side surface of the casing. The reflected optical signal having the third wavelength and the fourth wavelength is reflected toward the fourth wavelength filter, and is incident on the fourth input / output port into the casing. A second signal that reflects the optical signal having the third wavelength transmitted through the first wavelength filter and the optical signal having the fourth wavelength reflected by the fourth wavelength filter toward the first wavelength filter; An optical multiplexer / demultiplexer characterized by comprising:   15. The optical multiplexer / demultiplexer according to claim 14, wherein the fourth optical transmission means is disposed in the vicinity of the first wavelength filter, the fourth wavelength filter, and the fifth input / output port. A fifth wavelength filter that transmits only the optical signal having the fourth wavelength, and an optical signal having the fourth wavelength reflected by the fourth wavelength filter is directed toward the fifth wavelength filter. Reflecting and reflecting the optical signal having the fourth wavelength incident on the casing from the fifth input / output port and transmitted through the fifth wavelength filter toward the fourth wavelength filter. An optical multiplexer / demultiplexer comprising three reflecting means.   16. The optical multiplexer / demultiplexer according to claim 15, wherein each of the first reflecting means to the third reflecting means is constituted by a single mirror.   12. The optical multiplexer / demultiplexer according to claim 11, wherein the first optical transmission means is disposed in the vicinity of the second input / output port and transmits only an optical signal having the first wavelength; An optical multiplexer / demultiplexer comprising a first wavelength filter that reflects an optical signal having the second wavelength to the fourth wavelength.   18. The optical multiplexer / demultiplexer according to claim 17, wherein the second optical transmission means is disposed in the vicinity of the first wavelength filter and the third input / output port and has the second wavelength. A second wavelength filter that transmits only an optical signal and reflects an optical signal having the third wavelength and the fourth wavelength; and a second wavelength filter that is disposed on the first side surface of the housing, and The optical signal having the second to fourth wavelengths reflected by the first wavelength filter is reflected toward the second wavelength filter and is incident from the third input / output port. An optical multiplexer / demultiplexer comprising: first reflecting means for reflecting the optical signal having the second wavelength transmitted through the second wavelength filter toward the first wavelength filter.   19. The optical multiplexer / demultiplexer according to claim 18, wherein the third optical transmission means is disposed in the vicinity of the first wavelength filter, the second wavelength filter, and the fourth input / output port. A third wavelength filter that transmits only the optical signal having the third wavelength and reflects the optical signal having the fourth wavelength, and is disposed on the first side surface in the housing. The optical signal having the third wavelength and the fourth wavelength reflected by the second wavelength filter is reflected toward the third wavelength filter and is incident from the fourth input / output port. And a second reflecting means for reflecting the optical signal having the third wavelength transmitted through the third wavelength filter toward the second wavelength filter.   20. The optical multiplexer / demultiplexer according to claim 19, wherein the fourth optical transmission means includes the first wavelength filter, the second wavelength filter, the third wavelength filter, and the fifth input / output. A fourth wavelength filter that is disposed in the vicinity of the port and transmits only an optical signal having the fourth wavelength; and is disposed on the first side surface in the housing; and The optical signal having the fourth wavelength reflected by the wavelength filter is reflected toward the fourth wavelength filter, and is incident from the fifth input / output port and passes through the fourth wavelength filter. An optical multiplexer / demultiplexer comprising: third reflecting means for reflecting an optical signal having a fourth wavelength toward the third wavelength filter.   21. The optical multiplexer / demultiplexer according to claim 20, wherein the first reflecting means to the third reflecting means are constituted by a single mirror.   An optical multiplexer / demultiplexer for multiplexing / demultiplexing an optical signal having a wavelength group consisting of a first wavelength to a Pth wavelength (P is an integer of 3 or more) different from each other. A housing having a first side surface and a second side surface, a first input / output port disposed on the first side surface of the housing, and a second disposed on the second side surface of the housing. Input / output ports to (P + 1) -th input / output ports, and the first input / output port is for inputting / outputting an optical signal having the wavelength group to / from the casing, The second input / output port to the (P + 1) th input / output port are for inputting and outputting optical signals having the first wavelength to the Pth wavelength, respectively. 1st light transmission means to Pth light transmission means, and pth (p is a positive integer less than or equal to P) light transmission. The means transmits the optical signal having the pth wavelength incident from the first input / output port toward the (p + 1) th input / output port, and is input from the (p + 1) th input / output port. An optical multiplexer / demultiplexer which transmits an optical signal having the p-th wavelength toward the first input / output port.   An optical multiplexer for multiplexing optical signals having a wavelength group consisting of a first wavelength to a Pth wavelength (P is an integer of 3 or more) different from each other, the first side surface facing each other, and A housing having a second side surface; an exit port disposed on the first side surface of the housing; and a first incident port to a Pth incident surface disposed on the second side surface of the housing. And the emission port is for emitting an optical signal having the wavelength group from the casing, and the first to Pth incidence ports are respectively the first incidence port and the first incidence port. The casing is provided with a first light transmission means to a Pth light transmission means, and the pth (p is a positive value not greater than P). Light having the p-th wavelength incident from the p-th incident port. Optical multiplexer, characterized in that to transmit toward the exit port No..   An optical demultiplexer for demultiplexing an optical signal having a wavelength group composed of a first wavelength to a Pth wavelength (P is an integer of 3 or more) different from each other, the first side surfaces facing each other And a housing having a second side surface, an incident port disposed on the first side surface of the housing, and a first exit port to a Pth port disposed on the second side surface of the housing. An exit port, and the entrance port is for entering an optical signal having the wavelength group into the housing. The first exit port to the P-th exit port are the first exit port, respectively. To emit an optical signal having the wavelength from the Pth to the Pth wavelength, and the housing includes first to Pth light transmission means, and the pth (p is less than or equal to P) A light transmission means having a p-th wavelength incident from the incident port; Optical demultiplexer, characterized by transmitting towards the exit port of the p.   A housing having a first side surface and a second side surface facing each other, a first input / output port and a second input / output port disposed on the first side surface of the housing, and the housing A third input / output port disposed on the second side surface to a sixth input / output port, wherein the first input / output port includes first to fourth wavelengths different from each other. An optical signal having a wavelength group and an optical signal having a second wavelength group composed of other wavelengths are input / exited to / from the housing, and the second input / output port is the first For inputting / exiting optical signals of two wavelength groups to / from the housing, and the third input / output port to the sixth input / output port are respectively the first wavelength to the fourth wavelength. The optical signal having a wavelength of 1 is input / output, and the housing is configured to input and output the first input / output port. And an optical signal having the first wavelength group among optical signals incident from the first input / output port, and the second input / output port. The optical signal having the second wavelength group is reflected toward the second incoming / outgoing port, and the optical signal having the second wavelength group incident from the second incoming / outgoing port is reflected and reflected. The transmitted optical signal having the second wavelength group is combined with the optical signal having the first wavelength group incident from the second side surface and emitted toward the first input / output port. / Reflecting means, and an optical signal having the first wavelength incident from the first incident / exit port through the transmitting / reflecting means is transmitted toward the third incident / exit port, and the third An optical signal having the first wavelength incident from the input / output port of the first through the transmission / reflection means. First light transmitting means for transmitting the light to the light incident / exit port, and an optical signal having the second wavelength incident from the first light incident / exit port via the transmission / reflection means. A second signal is transmitted to the output port and the optical signal having the second wavelength incident from the fourth input / output port is transmitted to the first input / output port through the transmission / reflection means. And transmitting the optical signal having the third wavelength incident from the first input / output port through the transmission / reflection unit to the fifth input / output port, and A third light transmitting means for transmitting an optical signal having the third wavelength incident from a fifth input / output port toward the first input / output port via the transmission / reflection means; The fourth wave incident from the incident / exit port of the light through the transmission / reflection means An optical signal having a long wavelength is transmitted toward the sixth input / output port, and the optical signal having the fourth wavelength incident from the sixth input / output port is transmitted through the transmission / reflection means. And an optical multiplexer / demultiplexer characterized by comprising: a fourth optical transmission means for transmission toward one input / output port.   26. The optical multiplexer / demultiplexer according to claim 25, wherein the first light transmission means is disposed between the transmission / reflection means and the second side surface of the casing, and the first wavelength and A first wavelength filter that transmits an optical signal having the second wavelength and reflects an optical signal having the third wavelength and the fourth wavelength; and in the vicinity of the third input / output port A second wavelength that is disposed between the first wavelength filter and the second side surface, transmits an optical signal having the first wavelength, and reflects the optical signal having the second wavelength. An optical multiplexer / demultiplexer comprising a filter.   27. The optical multiplexer / demultiplexer according to claim 26, wherein the second optical transmission means is disposed in the vicinity of the first wavelength filter, the second wavelength filter, and the fourth input / output port, A third wavelength filter that transmits only the optical signal having the second wavelength, and an optical signal having the second wavelength reflected by the second wavelength filter is reflected toward the third wavelength filter. And a first signal that reflects the optical signal having the second wavelength that has entered the housing from the fourth input / output port and transmitted through the third wavelength filter toward the second wavelength filter. An optical multiplexer / demultiplexer characterized by comprising:   28. The optical multiplexer / demultiplexer according to claim 27, wherein the third optical transmission means is disposed in the vicinity of the first wavelength filter and the fifth input / output port and has the third wavelength. A fourth wavelength filter that transmits an optical signal and reflects an optical signal having the fourth wavelength; and is disposed on the first side surface of the casing and reflected by the first wavelength filter. The reflected optical signal having the third wavelength and the fourth wavelength is reflected toward the fourth wavelength filter, and is further incident into the casing from the fifth input / output port. A second signal that reflects the optical signal having the third wavelength transmitted through the wavelength filter and the optical signal having the fourth wavelength reflected by the fourth wavelength filter toward the first wavelength filter; An optical multiplexer / demultiplexer comprising reflecting means.   The optical multiplexer / demultiplexer according to claim 28, wherein the fourth light transmission means is disposed in the vicinity of the first wavelength filter, the fourth wavelength filter, and the sixth input / output port, The fifth wavelength filter that transmits only the optical signal having the fourth wavelength and the optical signal having the fourth wavelength reflected by the fourth wavelength filter are directed toward the fifth wavelength filter. Reflecting and reflecting the optical signal having the fourth wavelength, which has entered the housing from the sixth input / output port and transmitted through the fifth wavelength filter, toward the fourth wavelength filter. An optical multiplexer / demultiplexer comprising three reflecting means.   30. The optical multiplexer / demultiplexer according to claim 29, wherein each of the first reflecting means to the third reflecting means comprises a single mirror.   The optical multiplexer / demultiplexer according to claim 25, wherein the first optical transmission means is disposed in the vicinity of the third input / output port and transmits only an optical signal having the first wavelength; An optical multiplexer / demultiplexer comprising a first wavelength filter that reflects an optical signal having the second wavelength to the fourth wavelength.   32. The optical multiplexer / demultiplexer according to claim 31, wherein the second optical transmission means is disposed in the vicinity of the first wavelength filter and the fourth input / output port and has the second wavelength. The second wavelength filter that transmits only the optical signal and reflects the optical signal having the third wavelength and the fourth wavelength, and is disposed on the first side surface side of the casing; The optical signal having the second wavelength to the fourth wavelength reflected by the first wavelength filter is reflected toward the second wavelength filter, and is incident from the fourth input / output port. An optical multiplexer / demultiplexer comprising: first reflecting means for reflecting the optical signal having the second wavelength transmitted through the second wavelength filter toward the first wavelength filter.   The optical multiplexer / demultiplexer according to claim 32, wherein the third light transmission means is disposed in the vicinity of the first wavelength filter, the second wavelength filter, and the fifth input / output port, A third wavelength filter that transmits only the optical signal having the third wavelength and reflects the optical signal having the fourth wavelength, and is disposed on the first side surface in the housing; The optical signal having the third wavelength and the fourth wavelength reflected by the second wavelength filter is reflected toward the third wavelength filter and is further incident from the fifth input / output port. An optical multiplexer / demultiplexer comprising: second reflecting means for reflecting the optical signal having the third wavelength transmitted through the third wavelength filter toward the second wavelength filter.   34. The optical multiplexer / demultiplexer according to claim 33, wherein the fourth optical transmission means includes the first wavelength filter, the second wavelength filter, the third wavelength filter, and the sixth input / output port. The fourth wavelength filter that transmits only the optical signal having the fourth wavelength, and the third wavelength filter that is disposed on the first side surface side in the housing, and the third wavelength. The optical signal having the fourth wavelength reflected by the filter is reflected toward the fourth wavelength filter, and is incident on the sixth input / output port and passes through the fourth wavelength filter. An optical multiplexer / demultiplexer comprising: a third reflecting means for reflecting an optical signal having a wavelength of 4 toward the third wavelength filter.   35. The optical multiplexer / demultiplexer according to claim 34, wherein the first reflecting means to the third reflecting means are constituted by a single mirror.   An optical signal having a first wavelength group consisting of a first wavelength to a Pth wavelength (where P is an integer of 3 or more) different from each other is multiplexed / demultiplexed with another optical signal, or An optical multiplexer / demultiplexer for multiplexing / demultiplexing an optical signal having a first wavelength group from the other optical signal, a housing having a first side surface and a second side surface facing each other; A first input / output port and a second input / output port disposed on the first side surface of the casing; and a third input / output port disposed on the second side surface of the casing. P + 2) input / output port, wherein the first input / output port transmits the optical signal having the first wavelength group and the optical signal having the second wavelength group consisting of other wavelengths. And the second input / output port transmits an optical signal of the second wavelength group to the housing. The third input / output port to the (P + 2) input / output port are used to input / output optical signals having the first wavelength to the Pth wavelength, respectively. The housing includes transmission / reflection means disposed in the vicinity of the first input / output port and the second input / output port, and first light transmission means to P-th transmission means, The transmission / reflection means transmits an optical signal having the first wavelength group among optical signals incident from the first input / output port, and transmits an optical signal having the second wavelength group to the first signal. 2 is reflected toward the two incoming / outgoing ports, further reflects the optical signal having the second wavelength group incident from the second incoming / outgoing port, and has the reflected second wavelength group. Is combined with an optical signal having the first wavelength group incident from the second side surface side. The p-th (p is a positive integer less than or equal to P) light transmitting means that is emitted toward the first incident / exit port is incident on the first incident / exit port through the transmission / reflection means. An optical signal having a wavelength of p is transmitted toward the (p + 2) input / output port, and the optical signal having the pth wavelength incident from the (p + 2) input / output port is transmitted / reflected. An optical multiplexer / demultiplexer that transmits the signal to the first input / output port through the optical fiber.   An optical multiplexer / demultiplexer unit comprising a plurality of optical multiplexers / demultiplexers according to claim 36 connected in series / parallel.   The first to Nth optical multiplexer / demultiplexers are connected in cascade so as to correspond to a wavelength of P × N (where P is an integer of 3 or more) for a natural number N of 2 or more. An optical multiplexing / demultiplexing unit configured as described above, wherein the n-th optical multiplexer / demultiplexer (where N and n are integers satisfying the relationship 1 ≦ n ≦ N) is {P (n−1) +1} An optical signal having the nth wavelength group composed of the wavelengths of Pn to Pn is demultiplexed / multiplexed with another optical signal, or an optical signal having the nth wavelength group is separated from the other optical signal. The first optical multiplexer / demultiplexer through the Nth optical multiplexer / demultiplexer each have a first housing through an Nth housing, and the first optical multiplexer / demultiplexer To the Nth housing have first and second side surfaces that face each other, and the nth optical multiplexer / demultiplexer has an nth value for Q equal to P + 2. {Q (n-1) +1} input / output ports and {Q (n-1) +2} input / output ports arranged on the first side surface of the housing; and the nth housing {Q (n-1) +3} th input / output port to Qnth input / output port arranged on the second side surface, and the {Q (n-1) +1} th input / output port is , An optical signal having an nth wavelength group and an optical signal having an (n + 1) th wavelength group to an Nth wavelength group for entering and exiting the nth casing, The input / output port {Q (n−1) +2} is used to input and output optical signals of the (n + 1) th wavelength group to the Nth wavelength group with respect to the nth casing. Yes (however, when n is equal to N, it indicates that there is no optical signal input / output), the {Q (n-1) +3} input / output ports through the Qn input / output The injection port is used to input and output optical signals having wavelengths of the {P (n−1) +1} th to Pn th wavelengths, respectively, and the {Q ( The (n-1) +2} input / output port is optically coupled to the (Qn + 1) th input / output port of the (n + 1) th casing (provided that the connection destination is n when n is equal to N). An optical multiplexing / demultiplexing unit characterized in that it indicates no state).   38. The optical multiplexing / demultiplexing unit according to claim 37, wherein the nth casing includes the {Q (n-1) +1} input / output port and the {Q (n-1) +2} input / output port. N-th transmission / reflection means and {P (n−1) +1} -th light transmission means to Pn-th light transmission means, wherein the n-th transmission / reflection means includes The optical signal having the nth wavelength group among the optical signals incident from the {Q (n−1) +1} input / output ports is transmitted, and the (n + 1) th wavelength group to the Nth wavelength group are transmitted. An optical signal having a wavelength group is reflected toward the {Q (n−1) +2} input / output port, and is further input from the {Q (n−1) +2} input / output port. n + 1) the optical signal having the wavelength group to the Nth wavelength group is reflected, and the reflected (n + 1) th wavelength group to the Nth wave An optical signal having a group is combined with an optical signal having the nth wavelength group incident from the second side surface, and emitted toward the {Q (n−1) +1} input / output port. The {P (n−1) +1} th light transmission means to the Pn th light transmission means respectively pass through the {Q (n−1) +1} input / output ports from the nth transmission / output. An optical signal having a wavelength of {(P (n−1) +1) to Pn that is incident through a reflecting means is input to an output port of {Q (n−1) +3} to Qn. To the {Q (n-1) +3} through the Qn input / output ports, and having the {P (n-1) +1} through the Pn wavelengths. Is transmitted to the {Q (n−1) +1} input / output ports through the nth transmission / reflection means. Tsu door.   One input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface of the housing formed to transmit three light beams, and two input / output ports are provided in the vicinity of the outer side on the other side. And having two different wavelengths of light incident separately from the two input / output ports and combined to the one input / output port, or incident from the one input / output port and the two input / output ports An optical multiplexer / demultiplexer that can enter and exit in both directions by demultiplexing to a port, and transmits light of one wavelength at the two different wavelengths and reflects light of the other wavelength And a total reflection mirror that totally reflects the light of the other wavelength are disposed in the housing, and further, one of the input / output ports in the one input / output port and the two input / output ports The optical axis of light rays entering and exiting each port are almost the same. The wavelength filter is arranged at a predetermined angle on the optical axis, and the total reflection mirror is input / output at the other input / output port in the two input / output ports. The two input / output ports are substantially parallel to the optical axis of the light beam coupled from the one input / output port to one of the two input / output ports. The light having one wavelength is disposed at a predetermined position at a predetermined angle with respect to the optical axis of a light beam entering / exiting the other light input / output port in the output port. The first input / output port is optically coupled to the one input / output port via the wavelength filter, and the light having the other wavelength is coupled to the one input / output port and the two input / output ports. Between the other input / output port Demultiplexer, characterized in that it is optically coupled through a long filter and the total reflection mirror.   One input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to transmit five light beams, and four input / output ports are provided in the vicinity of the outer side on the other side. And having four different wavelengths of light incident separately from the four input / output ports and combined to the one input / output port, or incident from the one input / output port and the four input / output ports An optical multiplexer / demultiplexer capable of bidirectional input / output by demultiplexing to a port, transmitting light of the first wavelength and the second wavelength at the four different wavelengths, and A first wavelength filter that reflects light of a third wavelength and a fourth wavelength; a second wavelength filter that transmits light of the first wavelength and reflects light of the second wavelength; A third wavelength filter that transmits only light of the second wavelength, and light of the third wavelength. And a fourth wavelength filter that reflects light of the fourth wavelength, a fifth wavelength filter that transmits only light of the fourth wavelength, and a second filter that totally reflects light of the second wavelength. One total reflection mirror, a second total reflection mirror that totally reflects the light of the third wavelength and the fourth wavelength, and a third total reflection mirror that totally reflects the light of the fourth wavelength; Are arranged in the housing, and the first input / output port of the one input / output port and the four input / output ports substantially coincide with the optical axes of the incident / exit light beams. Arranged on a substantially straight line, the first wavelength filter and the second wavelength filter are arranged at predetermined angles on the optical axis, respectively, and the first total reflection mirror, the second total reflection mirror, And the third total reflection mirror is provided in the four input / output ports. The optical axis of the light beam that is coupled to the first input / output port from the one input / output port is the optical axis of the light beam that enters / exits the first input / output port, the third input / output port, and the fourth input / output port. At a predetermined angle with respect to the optical axes of the light beams entering and exiting the second entrance / exit port, the third entrance / exit port, and the fourth entrance / exit port, respectively. The third wavelength filter, the fourth wavelength filter, and the fifth wavelength filter are arranged at predetermined angles with respect to respective optical axes, and the first wavelength filter is arranged at a predetermined position; Light is optically coupled between the one input / output port and the first input / output port via the first wavelength filter and the second wavelength filter, and has the second wavelength. The light enters the one input / output port and the second input / output port. Through the first wavelength filter, the second wavelength filter, and the third wavelength filter and the first total reflection mirror, and the third wavelength filter. Is optically transmitted between the one input / output port and the third input / output port via the first wavelength filter, the fourth wavelength filter, and the second total reflection mirror. The light of the fourth wavelength is coupled between the one input / output port and the fourth input / output port, and the first wavelength filter, the fourth wavelength filter, and the fifth wavelength are combined. An optical multiplexer / demultiplexer, which is optically coupled through a filter, the second total reflection mirror, and the third total reflection mirror.   Three incident / exit ports are provided in the vicinity of the outer side on one side of the opposing wall surface of the casing formed to transmit seven light beams, and four input / output ports are provided in the outer vicinity of the other side. And having six different wavelengths of light from the three input / output ports and the second input / output port, the third input / output port, and the fourth input / output port of the four input / output ports. Separately enter and combine to the first input / output port in the four input / output ports, or enter from the first input / output port and enter the three input / output ports and the four input / output ports. An optical multiplexer / demultiplexer capable of bi-directional input / output by demultiplexing into a second input / output port, a third input / output port, and a fourth input / output port in the output port , The first wavelength, the second wavelength, and the third wavelength of the six different wavelengths. A first wavelength filter that reflects the light of the fourth wavelength, the fifth wavelength, and the sixth wavelength, the light of the first wavelength, and the second wavelength and A second wavelength filter that reflects light of the third wavelength, a third wavelength filter that transmits light of the second wavelength and reflects light of the third wavelength, and the third wavelength filter A fourth wavelength filter that transmits only light of a wavelength; a fifth wavelength filter that transmits light of the fourth wavelength and reflects light of the fifth wavelength and the sixth wavelength; A sixth wavelength filter that transmits light of the fifth wavelength and reflects light of the sixth wavelength; a seventh wavelength filter that transmits only light of the sixth wavelength; and the second wavelength filter A first mirror surface that reflects light of the wavelength and the third wavelength, and light of the fifth wavelength and the sixth wavelength; A total reflection mirror having a second mirror surface on one side of each of the first mirror surface and the second mirror surface is disposed in the casing, and further includes a first input / output port in the first input / output port and the three input / output ports. The ports are arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams substantially coincide with each other, and the first wavelength filter and the second wavelength filter are arranged at predetermined angles on the optical axis, respectively. The third wavelength filter, the fourth wavelength filter, and the total reflection mirror enter / exit the second input / output port and the third input / output port of the three input / output ports. With respect to the optical axis of the light beam that is coupled from the first input / output port at the four input / output ports to the first input / output port at the three input / output ports. The three incoming and outgoing lights are almost parallel to each other. A port is disposed at a predetermined position at a predetermined angle with respect to the optical axis of the light beam entering / exiting the second input / output port and the third input / output port. Each of the second input / output ports and the fifth wavelength filter are arranged so that their optical axes coincide with the direction of the light reflected by the first wavelength filter, and the second input / output ports correspond to the four input / output ports. The third input / output port, the fourth input / output port, the sixth wavelength filter, and the seventh wavelength filter are the third input / output ports in the four input / output ports. And a predetermined angle at a predetermined angle so that the optical axes of the light beams entering and exiting the fourth input / output port are substantially parallel to the optical axes of the second input / output ports in the four input / output ports. The light of the first wavelength is disposed at a position of the four input / output ports. Through the first wavelength filter and the second wavelength filter between the first input / output port in the first port and the first input / output port in the three input / output ports. The optically coupled light of the second wavelength is the first input / output port in the four input / output ports and the second input / output port in the three input / output ports. Are coupled optically via the first wavelength filter, the second wavelength filter, and the third wavelength filter and the total reflection mirror, and the light of the third wavelength is The first wavelength filter and the second wavelength between the first input / output port in the four input / output ports and the third input / output port in the three input / output ports Filter, third wavelength filter, and fourth wave Optically coupled through a filter and the total reflection mirror, the light having the fourth wavelength is the first input / output port and the second input / output port in the four input / output ports. Between the first wavelength filter, the fifth wavelength filter, and the total reflection mirror, and the light of the fifth wavelength is in the four input / output ports. The first wavelength filter, the fifth wavelength filter, and the sixth wavelength filter and the total reflection mirror are optically connected between the first input / output port and the third input / output port. The sixth wavelength light is coupled between the first input / output port and the fourth input / output port in the four input / output ports. 5 wavelength filters, the sixth wavelength filter, And an optical multiplexer / demultiplexer optically coupled via the seventh wavelength filter and the total reflection mirror.   One incident / outgoing port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to transmit five light beams, and four input / output ports are provided in the vicinity of the outer side on the other side. And four different wavelengths of light are incident separately from the four input / output ports and multiplexed to the one input / output port, or incident from the one input / output port and the four input / output ports. An optical multiplexer / demultiplexer capable of bidirectional input / output by demultiplexing to a port, which transmits light of the first wavelength at the four different wavelengths, and another second wavelength , The third wavelength and the first wavelength filter that reflects the light of the fourth wavelength, and the light of the second wavelength is transmitted and the light of the third wavelength and the fourth wavelength is reflected A second wavelength filter that transmits light of the third wavelength and reflects light of the fourth wavelength. The third wavelength filter, the fourth wavelength filter that transmits only the light of the fourth wavelength, the second wavelength, the third wavelength, and the light of the fourth wavelength are totally reflected. A total reflection mirror, a translucent substrate on which the first to fourth wavelength filters and the total reflection mirror are fixed, are provided in the housing, and further, the one input / output port and the one The first input / output ports in the four input / output ports are arranged on a substantially straight line so that the optical axes of the incoming and outgoing light beams substantially coincide with each other, and are fixed to the translucent substrate. The wavelength filter is arranged at a predetermined angle on the optical axis, and the total reflection mirror fixed to the translucent substrate includes a second input / output port and a third input / output port in the four input / output ports. Light entering and exiting the 4th entrance / exit port The second input / output port and the third input / output port so that the optical axis is substantially parallel to the optical axis of the light beam coupled from the one input / output port to the first input / output port. And the second wavelength filter disposed at a predetermined position at a predetermined angle with respect to the optical axis of the light beam entering and exiting the fourth input / output port, and fixed to the translucent substrate, The wavelength filter 3 and the fourth wavelength filter are arranged at predetermined angles with respect to the respective optical axes, and the light of the first wavelength is transmitted to the one input / output port and the first input / output port. Optically coupled to the output port via the first wavelength filter fixed to the translucent substrate, and the light of the second wavelength is transmitted to the one input / output port and the second output port. The second fixed to the translucent substrate between the input / output ports Optically coupled via a wavelength filter, the third wavelength filter, and the total reflection mirror, and the light of the third wavelength is between the one input / output port and the third input / output port. And optically coupled via the first wavelength filter, the second wavelength filter, the third wavelength filter and the total reflection mirror respectively fixed to the light transmitting substrate. The light having the wavelength of the first wavelength filter, the second wavelength filter, the first wavelength filter fixed to the translucent substrate between the one input / output port and the fourth input / output port, respectively. 3 and an optical multiplexer / demultiplexer optically coupled via the fourth wavelength filter and the total reflection mirror.   One input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to transmit five light beams, and four input / output ports are provided in the vicinity of the outer side on the other side. And having four different wavelengths of light incident separately from the four input / output ports and combined to the one input / output port, or incident from the one input / output port and the four input / output ports An optical multiplexer / demultiplexer capable of bidirectional input / output by demultiplexing to a port, transmitting light of the first wavelength and the second wavelength at the four different wavelengths, and A first wavelength filter that reflects light of a third wavelength and a fourth wavelength; a second wavelength filter that transmits light of the first wavelength and reflects light of the second wavelength; A third wavelength filter that transmits only light of the second wavelength, and light of the third wavelength. And a fourth wavelength filter that reflects light of the fourth wavelength, a fifth wavelength filter that transmits only light of the fourth wavelength, and a second filter that totally reflects light of the second wavelength. One total reflection mirror, a second total reflection mirror that totally reflects the light of the third wavelength and the fourth wavelength, and a third total reflection mirror that totally reflects the light of the fourth wavelength; A translucent substrate to which the first to fifth wavelength filters, the first total reflection mirror and the third total reflection mirror are fixed is disposed in the casing; One incident / exit port and the first incident / exit port in the four incident / exit ports are arranged on a substantially straight line so that the optical axes of the incident / exiting light beams substantially coincide with each other, and the translucency The first wavelength filter and the second wavelength filter fixed to a substrate are: The first total reflection mirror, the third total reflection mirror, and the second total reflection mirror, which are arranged at a predetermined angle on each optical axis and fixed to the translucent substrate, The optical axes of the light beams entering / exiting the second input / output port, the third input / output port, and the fourth input / output port in the four input / output ports are connected to the first input / output port from the first input / output port. Light rays entering and exiting the second entrance / exit port, the third entrance / exit port, and the fourth entrance / exit port so as to be substantially parallel to the optical axis of the light beam coupled to the entrance / exit port The third wavelength filter, the fourth wavelength filter, and the fifth wavelength filter, which are disposed at predetermined positions at respective predetermined angles with respect to the optical axis and fixed to the translucent substrate, Are arranged at predetermined angles with respect to the optical axis of the first wavelength, Light is optically coupled between the one input / output port and the first input / output port via the first wavelength filter and the second wavelength filter fixed to the translucent substrate. The first wavelength filter fixed to the translucent substrate between the one input / output port and the second input / output port, the second wavelength light, And the third wavelength filter and the first total reflection mirror, and the light having the third wavelength is coupled to the one input / output port and the third input / output port. Between the first wavelength filter and the fourth wavelength filter fixed to the translucent substrate and the second total reflection mirror, and the fourth wavelength filter The light is transmitted through the one input / output port and the fourth input / output port. The first wavelength filter, the fourth wavelength filter, and the fifth wavelength filter, the second total reflection mirror, and the translucent substrate fixed to the translucent substrate. An optical multiplexer / demultiplexer, which is optically coupled via the third total reflection mirror.   One input / output port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to transmit five light beams, and four input / output ports are provided in the vicinity of the outer side on the other side. And having four different wavelengths of light incident separately from the four input / output ports and combined to the one input / output port, or incident from the one input / output port and the four input / output ports An optical multiplexer / demultiplexer capable of bidirectional input / output by demultiplexing to a port, transmitting light of the first wavelength and the second wavelength at the four different wavelengths, and A first wavelength filter that reflects light of a third wavelength and a fourth wavelength; a second wavelength filter that transmits light of the first wavelength and reflects light of the second wavelength; A third wavelength filter that transmits only light of the second wavelength, and light of the third wavelength. And a fourth wavelength filter that reflects light of the fourth wavelength, a fifth wavelength filter that transmits only light of the fourth wavelength, and a second filter that totally reflects light of the second wavelength. One total reflection mirror, a second total reflection mirror that totally reflects the light of the third wavelength and the fourth wavelength, and a third total reflection mirror that totally reflects the light of the fourth wavelength; , The first translucent substrate to which the three total reflection mirrors and the first wavelength filter are fixed, the first wavelength filter to the fifth wavelength filter, the first total reflection mirror, and the A second translucent substrate to which a third total reflection mirror is fixed is disposed in the casing, and further includes a first incident / exit at the one incident / exit port and the four incident / exit ports. Ports are arranged on a substantially straight line so that the optical axes of incoming and outgoing rays are almost the same. The first wavelength filter fixed to the first light transmissive substrate and the second light transmissive substrate, and the second wavelength filter fixed to the second light transmissive substrate. The first total reflection mirror disposed on the optical axis at a predetermined angle and fixed to the first translucent substrate and the second translucent substrate, and the first translucent substrate The second total reflection mirror fixed to the first transmission substrate, and the third total reflection mirror fixed to the first light transmission substrate and the second light transmission substrate. The optical axes of the light beams entering and exiting the second entrance / exit port, the third entrance / exit port, and the fourth entrance / exit port are coupled from the one entrance / exit port to the first entrance / exit port. The second input / output port, the third input / output port, and the The third wavelength filter disposed at a predetermined position at a predetermined angle with respect to an optical axis of a light beam entering / exiting the fourth light incident / exit port, and fixed to the second light transmitting substrate, The fourth wavelength filter and the fifth wavelength filter are arranged at predetermined angles with respect to the respective optical axes, and the light of the first wavelength is transmitted to the one input / output port and the first wavelength The first wavelength filter fixed to the first light transmissive substrate and the second light transmissive substrate between the input and output ports and the second light wave fixed to the second light transmissive substrate. The second wavelength light is optically coupled through the wavelength filter of the first light transmitting substrate and the second light incident / exit port, and 1st wavelength filter fixed to the 2nd translucent board | substrate, this 2nd translucent board | substrate The fixed second wavelength filter, the third wavelength filter fixed to the second light transmitting substrate, the first light transmitting substrate, and the second light transmitting substrate. In addition, the light having the third wavelength is optically coupled via the first total reflection mirror, and the light having the third wavelength is transmitted between the one input / output port and the third input / output port. The first wavelength filter fixed to the optical substrate and the second transparent substrate, the fourth wavelength filter fixed to the second transparent substrate, and the first transparent substrate Optically coupled through the second total reflection mirror fixed to the first and second light beams, and the fourth wavelength light is transmitted between the one input / output port and the fourth input / output port. The first wavelength filter fixed to the first translucent substrate, the second translucent substrate, and the second translucent substrate; The fourth wavelength filter, the fifth wavelength filter fixed to the second translucent substrate, the second total reflection mirror fixed to the first translucent substrate, and the An optical multiplexer / demultiplexer characterized in that it is optically coupled through a first translucent substrate and the third total reflection mirror fixed to the second translucent substrate. One incident / outgoing port is provided in the vicinity of the outer side on one side of the opposing wall surface in the casing formed to transmit five light beams, and four input / output ports are provided in the vicinity of the outer side on the other side. And four different wavelengths of light are incident separately from the four input / output ports and multiplexed to the one input / output port, or incident from the one input / output port and the four input / output ports. An optical multiplexer / demultiplexer capable of bidirectional input / output by demultiplexing to a port, transmitting light of the first wavelength and the second wavelength at the four different wavelengths, and A first wavelength filter that reflects light of a third wavelength and a fourth wavelength; a second wavelength filter that transmits light of the first wavelength and reflects light of the second wavelength; A third wavelength filter that transmits only light of the second wavelength, and light of the third wavelength. And a fourth wavelength filter that reflects the light of the fourth wavelength, a fifth wavelength filter that transmits only the light of the fourth wavelength, the light of the third wavelength, and the fourth wavelength A first total reflection mirror that totally reflects light of a wavelength; a second total reflection mirror that totally reflects light of the second wavelength; and a third total reflection mirror that totally reflects light of the fourth wavelength. A first translucent substrate on which the first total reflection mirror to the third total reflection mirror and the first wavelength filter are fixed, and the first wavelength filter to the fifth wavelength filter. A second translucent substrate to which the first translucent substrate is fixed, and a third translucent substrate to which the first translucent substrate and the second translucent substrate are fixed. The one input / output port and the first input / output port in the four input / output ports are respectively input / output The first wavelength filter and the second wavelength filter, which are arranged on a substantially straight line so as to substantially coincide with the optical axes of the light rays to be fixed, are fixed to the first light transmitting substrate and the second light transmitting substrate. The second wavelength filter fixed to the translucent substrate is arranged at a predetermined angle on the optical axis, respectively, and the first total reflection mirror fixed to the first translucent substrate, The second total reflection mirror and the third total reflection mirror are provided in the second input / output port, the third input / output port, and the fourth input / output port in the four input / output ports, respectively. The second input / output port, the second input port, and the second input / output port so that the optical axis of the input / output light beam is substantially parallel to the optical axis of the light beam coupled from the one input / output port to the first input / output port. 3 with respect to the optical axis of the light beam entering and exiting the fourth entrance / exit port. The third wavelength filter, the fourth wavelength filter, the fifth wavelength filter, which are disposed at predetermined positions at predetermined angles and fixed to the second translucent substrate, respectively, The third translucent substrate is disposed at a predetermined angle with respect to each optical axis, and the light having the first wavelength is transmitted between the one input / output port and the first input / output port. The first wavelength filter fixed to the first light transmitting substrate and the second light transmitting substrate, and the second wavelength filter fixed to the second light transmitting substrate. The second wavelength light is optically coupled through the first light transmitting substrate and the second light transmitting port between the one light incident / exit port and the second light incident / exit port. The first wavelength filter fixed to the transparent substrate and the second wavelength filter fixed to the second light-transmitting substrate Optically coupled through a long filter and the third wavelength filter fixed to the second light transmitting substrate and the second total reflection mirror fixed to the first light transmitting substrate The light of the third wavelength is fixed to the first light transmitting substrate and the second light transmitting substrate between the one input / output port and the third input / output port. Optically through the first wavelength filter, the fourth wavelength filter fixed to the second light transmitting substrate, and the first total reflection mirror fixed to the first light transmitting substrate. And the light of the fourth wavelength is transmitted to the first light transmitting substrate and the second light transmitting substrate between the one input / output port and the fourth input / output port. The first wavelength filter fixed, the fourth wavelength filter fixed to the second light-transmitting substrate, and the second Optically coupled via the fifth wavelength filter fixed to the translucent substrate, the first total reflection mirror and the third total reflection mirror fixed to the first translucent substrate. An optical multiplexer / demultiplexer characterized by being provided.

Images