JP2010060653A - Optical device and optical signal selection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device and an optical signal selection method, which have fewer filters when optical signals of a plurality of wavelengths are dealt with. <P>SOLUTION: In an optical waveguide layer 102, there are formed an incident waveguide 105<SB>0</SB>and first and second exiting waveguides 105<SB>1</SB>, 105<SB>2</SB>. The angle of incidence formed by the inclined waveguide portion 112<SB>0</SB>of the incident waveguide 105<SB>0</SB>with the face of a multi-layered film filter plate 104 is equal to the angle of reflection formed by the inclined waveguide portions 112<SB>1</SB>, 112<SB>2</SB>of the first and second exiting waveguides 105<SB>1</SB>, 105<SB>2</SB>with the face of the multi-layered film filter plate 104. The positions where the inclined waveguide portions 112<SB>0</SB>-112<SB>2</SB>come into contact with the multi-layered film filter plate 104 are different. Optical signals of different wavelengths are made incident on the first and the second incident waveguides 105<SB>1</SB>, 105<SB>2</SB>. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical device using an optical waveguide and an optical signal selection method, and in particular, an optical device suitable for a bidirectional optical transceiver module such as a multiplexing / demultiplexing module or a triplexer having a demultiplexing characteristic or a multiplexing characteristic, and The present invention relates to an optical signal selection method.

  With the development of optical devices in recent years, optical communication systems have grown dramatically. For this reason, a technique relating to speeding up and increasing the number of wavelengths that can increase the utilization efficiency of the optical fiber has attracted particular attention.

On the other hand, with the recent progress of technology related to FTTH (Fiber To The Home), in addition to the technology such as high speed and multi-wavelength, the technology related to cost reduction and miniaturization has become important. More recently, it has been realized not only to multiplex / demultiplex wavelengths on the transmission side and reception side for communication, but also to transmit video signals at different wavelengths in order to further expand services. Under such circumstances, as a related technique related to the present invention, a bidirectional optical transmission / reception module called a triplexer has been developed (see, for example, Patent Document 1).
Japanese Patent Laying-Open No. 2005-165293 (paragraphs 0018 and 0019, FIG. 2)

  In this related technology, although not shown, the first and second optical signals incident on the platform (substrate) from the optical fiber are incident on the first filter, and the optical signal having the first wavelength is reflected. To the first optical receiver. In addition, the second optical signal that has passed through the first filter is incident on the second filter, reflected, and received by the second optical receiver. Further, an optical signal output from the optical transmitter is made incident from behind the second filter, and the optical signal transmitted through the second filter is also transmitted through the first filter to enter the optical fiber. ing.

  As described above, according to this related technique, each filter simply reflects and transmits light, so that the first and second filters are required as a triplexer, the structure of the optical device is complicated, and the size of the apparatus is reduced. There was a problem that it was difficult to reduce the price.

  Therefore, an object of the present invention is to provide an optical device and an optical signal selection method capable of reducing the number of filters when handling optical signals of a plurality of wavelengths.

  In the present invention, (a) a substrate, (b) a multilayer filter suspended from the upper surface in a form protruding at least a predetermined length from a predetermined position on the upper surface of the substrate; An incident waveguide formed in the optical waveguide layer laminated on the upper surface, and allowing an optical signal to enter the multilayer filter at a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter; The optical waveguide layer is formed independently of the incident waveguide and has the same reflection angle as the predetermined incident angle from the multilayer filter at one or a plurality of positions different from the incident position. The optical device is provided with one or a plurality of reflection-type emission waveguides that individually receive the emitted optical signals.

  In the present invention, (a) the substrate, (b) the optical waveguide layer laminated on the upper surface of the substrate, and (c) the incident surface is parallel to one end surface of the substrate including the optical waveguide layer. And (d) an optical signal which is formed in the optical waveguide layer and has a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter. The incident waveguide to be incident and (e) the above-described incident waveguide is formed in the above-described optical waveguide layer independently from the above-described multilayer filter at one or a plurality of positions different from the above-described incident position. The optical device is provided with one or a plurality of reflective emission waveguides that individually receive optical signals emitted at the same reflection angle as the predetermined incident angle.

  Further, in the present invention, (a) a substrate, and (b) a multilayer filter suspended from the upper surface so as to protrude at least a predetermined length from a predetermined position on the upper surface of the substrate, and (c) the substrate described above. An incident waveguide that is formed in an optical waveguide layer that is laminated on the upper surface of the optical filter and that makes an optical signal incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter; The aforementioned optical waveguide layer is formed independently of the aforementioned incident waveguide, and the above-mentioned predetermined filter is formed from the aforementioned multilayer filter at one or more positions on the exit surface opposite to the incident surface of the aforementioned multilayer filter. The optical device is provided with one or a plurality of transmissive emission waveguides that individually receive optical signals emitted at the same emission angle as the incident angle.

  Furthermore, in the present invention, (a) a substrate, and (b) a multilayer filter suspended from the upper surface so as to protrude at least a predetermined length from a predetermined position on the upper surface of the substrate; An incident waveguide formed in an optical waveguide layer laminated on the upper surface of the substrate and allowing an optical signal to enter the multilayer filter at a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter; ) The same reflection as the above-mentioned predetermined incident angle from the above-mentioned multilayer filter at one or a plurality of positions different from the above-mentioned incident position, formed in the above-mentioned optical waveguide layer independently of the above-mentioned incident waveguide. (1) one or a plurality of reflection type output waveguides that individually receive optical signals emitted at corners; and (e) the multilayer filter described above formed independently of the incident waveguide in the optical waveguide layer. of One or a plurality of transmission-type emission guides that individually receive optical signals emitted from the multilayer filter at the same emission angle as the predetermined incident angle at one or more positions on the emission surface opposite to the emission surface. An optical device is provided with a waveguide.

  In the present invention, as an optical signal selection method, an optical signal is incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident waveguide formed in the optical waveguide layer. The reflection light reflected by the reflection surface of the filter at the reflection angle equal to the incident angle described above is extracted as an optical signal having a wavelength component corresponding to the change in position at a position different from the incident position.

  In the present invention, as an optical signal selection method, an optical signal is incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident waveguide formed in the optical waveguide layer. It is characterized in that transmitted light emitted at a reflection angle equal to the incident angle described above is extracted as an optical signal having a wavelength component corresponding to a change in the emission position on the emission surface after transmission through the filter.

  As described above, according to the present invention, the wavelength is selected by paying attention to the fact that the optical signal uses the multilayer filter to change the reflection position or the emission position after transmission according to the wavelength. Demultiplexing or multiplexing of optical signals having a plurality of wavelengths can be realized using fewer filters than in the past. Therefore, it is possible not only to reduce the size and cost of the optical device by reducing the number of filters, but also to change the wavelength without changing the filter.

<First Embodiment>

  Next, the first embodiment of the present invention will be described.

  FIG. 1 shows a multiplexing / demultiplexing module according to the first embodiment of the present invention. FIG. 1 (A) is a view from above, and FIG. 1 (B) is AA. It shows a cross-sectional structure when cut in a direction. In the multiplexing / demultiplexing module 100, an optical waveguide layer 102 including a core and a clad is formed on a rectangular parallelepiped substrate 101. The substrate 101 has a slit 103 having a predetermined depth sufficiently deeper than the core of the optical waveguide layer 102 in a direction orthogonal to the longitudinal direction. In the slit 103, the multilayer filter plate 104 is attached with a permeable adhesive (not shown) in a state of being positioned along one of the side surfaces of the slit. A dielectric multilayer filter is used for the multilayer filter plate 104.

The core of the optical waveguide layer 102 is formed with input waveguide 105 ₀ As shown in FIG. (A), the first and second outgoing waveguide 105 _1, 105 _2. The position where the light having passed through the incident waveguide 105 ₀ enters on the surface of the multilayer filter plate 104 and the position where the first and second output waveguides 105 ₁ and 105 ₂ exit on the surface of the multilayer filter plate 104 are as follows. Each is different.

  In such a multiplexing / demultiplexing module 100, the constituent materials of the substrate 101 and the optical waveguide layer 102 are not particularly limited. As an example, the substrate 101 may be a Si (quartz) substrate, and the optical waveguide layer 102 may be a quartz waveguide formed on the quartz substrate. Further, the optical waveguide layer 102 is formed by crosslinking a polymer, forming a polymer waveguide as an optical waveguide layer 102 in the polymer structure, or forming a Ti diffusion waveguide formed on a lithium niobate substrate as the substrate 101 by thermal diffusion or the like. Alternatively, an optical semiconductor waveguide may be formed as the optical waveguide layer 102 on an InP (indium phosphide) substrate as the substrate 101.

  The groove-like slit 103 is generally formed by dicing, but can also be formed by dry etching.

Incidentally, the incident waveguide 105 ₀ and the first and second outgoing waveguides 105 ₁ and 105 ₂ are parallel waveguide portions 111 _{0 to} 111 ₂ parallel to the longitudinal direction of the surface of the substrate 101, respectively. An inclined waveguide portion (corresponding to an input port or an output port) 112 _{0 to} 112 ₂ bent from the end portion of the waveguide portion on the multilayer filter plate 104 side to the surface of the slit 103 on the side in contact with the multilayer filter plate 104 It is constituted by. The angle formed by the inclined waveguide portion 112 _{0 of} the incident waveguide 105 _{0 and} the plane of the multilayer filter plate 104 (incident angle) and the inclined waveguide portions of the first and second output waveguides 105 ₁ and 105 ₂ The angles (reflection angles) formed by 112 ₁ and 112 ₂ and the surface of the multilayer filter plate 104 are symmetric with respect to a normal line (not shown) orthogonal to the incident surface of the multilayer filter plate 104.

As described above, in the present embodiment, the positions where the inclined waveguide portions 112 _{0 to} 112 ₂ are in contact with the multilayer filter plate 104 are different. And, thereby, from the inclined waveguide portion 112 ₁ of the first output waveguide 105 ₁ the first wavelength lambda _1, also the second output waveguide 105 ₂ from the inclined waveguide portion 112 _Paragraph Two wavelengths λ ₂ can be selectively emitted.

  In order to understand this principle, the relationship between the filter group delay and the filter characteristics represented by the multilayer filter plate 104 will be described next.

  A multilayer filter generally used for wavelength multiplexing / demultiplexing can transmit or reflect a desired wavelength by design. In a multilayer film in which layers having a high refractive index and layers having a low refractive index are alternately stacked, if reflection occurs at different positions for each wavelength, they interfere in multiple ways. As a result, it is possible to obtain a filter characteristic in which a certain wavelength is transmitted and another wavelength is reflected.

  The filter characteristics are usually defined by the transmission loss for each wavelength. In addition to this, there is a characteristic called a group delay that occurs when a filter is transmitted or reflected as a characteristic indicating the filter. Group delay corresponds to the amount (or number) of multiple reflections in the filter. A large group delay means that it takes time from entering the filter to exiting. For example, taking the reflection characteristics of the filter as an example, if the group delay is large, the light beam is equivalently reflected deeper than the surface of the filter.

Considering the case where incident light is incident perpendicular to the filter, the difference in group delay only affects the difference in time. In contrast, the incident light as shown by the inclined waveguide section 112 ₀ of FIG. 1 is made incident obliquely with respect to the multilayer film filter plate 104, the difference in group delay, equivalently the multilayer filter plate 104 The reflection position on the surface changes. Therefore, the inclined waveguide portion 112 ₁ of the first output waveguide 105 _1, an inclined waveguide portion 112 ₂ of the second output waveguide 105 ₂ are emitting position as a position in contact with the multilayer filter plate 104 It will be different from each other.

In the present embodiment, this phenomenon is used. That is, by changing the wavelength group delay characteristics of the multilayer filter plate 104, the optical signal incident obliquely with respect to the multilayer film filter plate 104 from the inclined waveguide portions 112 _0, the group delay amount with each wavelength As a result, the location where the light is emitted changes. As a result, the arrangement of the waveguide of the emission port is selected according to the position of the wavelength of the optical signal emitted from the surface of the multilayer filter plate 104. Thus, even if one multilayer filter plate 104 is used, the reflected light can be demultiplexed into a plurality of wavelengths on the surface on which the optical signal is incident. This will be described more specifically.

FIG. 2 shows an example of the wavelength dependence of the group delay amount of the optical signal reflected from the multilayer filter. In this example, the group delay is small with respect to the first wavelength λ ₁ illustrated as a band-shaped portion where points are gathered, and the group delay is large relative to the second wavelength λ ₂ illustrated as a band-like portion where points are gathered. It is a value. That is, the optical signal of the second wavelength λ ₂ is reflected at a deeper position from the incident surface of the multilayer filter plate 104 shown in FIG. 1 than the optical signal of the first wavelength λ ₁ .

FIG. 3 schematically shows that the optical signal is reflected at a deeper position of the multilayer filter depending on the wavelength. The optical signals of the first and second wavelengths λ ₁ and λ ₂ are made incident on the multilayer filter plate 104 from the inclined waveguide portion 112 _{0 of} the incident waveguide 105 ₀ also shown in FIG. Then, the optical signal having the first wavelength λ ₁ is reflected at a relatively shallow position of the multilayer filter plate 104 and enters the inclined waveguide portion 112 ₁ of the first output waveguide 105 ₁ . This figure shows a case where an optical signal having the first wavelength λ ₁ is reflected near the surface of the multilayer filter plate 104. Accordingly, the inclined waveguide portion 112 ₀ is the position P ₀ in contact with the surface of the multilayer filter plate 104 are close to the position P ₁ of the inclined waveguide portion 112 ₁ is in contact with the surface of the multilayer filter plate 104.

On the other hand, the optical signal having the second wavelength λ ₂ is reflected at a relatively deep position of the multilayer filter plate 104. Therefore, the position P _{2 at which} the inclined waveguide portion 112 _{2 of} the second output waveguide 105 ₂ is in contact with the surface of the multilayer filter plate 104 is a position that is relatively far away from the position P ₀ and the position P ₁ . Therefore, the inclined waveguide portion 112 ₁ and the inclined waveguide portion 112 ₂ are arranged at predetermined positions on the surface of the multilayer filter plate 104 in advance, so that the inclined waveguide portion 112 ₁ and the inclined waveguide portion 112 ₂ are arranged in advance. An optical signal having a desired wavelength component can be selected and acquired from optical signals passing through _zero .

  FIG. 4 shows the group delay amount and the optimum interval between the incident side and the output waveguide. Here, the distance between the position where the incident-side optical waveguide 121 and the output-side optical waveguide 122 are in contact with the surface of the filter 123 is d, and the incident angle and the reflection angle θ of each of the optical waveguides 121 and 122 are both equal to 10 degrees. I'm calculating.

Referring to FIG. 2, the optical signal of the first wavelength λ ₁ has a group delay of about 0.01 ps (picosecond), and the optical signal of the second wavelength λ ₂ has a group delay of about 0.5 ps. When this is applied to FIG. 4, the optimum distances d ₁ and d ₂ between the entrance and exit waveguides for the optical signals of the first and second wavelengths λ ₁ and λ ₂ are 0.3 μm (micrometers), respectively. It becomes about 14.5um.

From the above results, in the case of the filter characteristic shown in FIG. 2, 0.3 um with respect to the position P ₀ of the input waveguide 105 ₀ shown in FIG. 3, the position P ₁ of the first output waveguide 105 ₁ If the position P ₂ of the _second output waveguide 105 ₂ is separated by about 14.5 μm in the same direction with respect to the position P ₀ , the first and second wavelengths λ ₁ and λ ₂ can be reduced. Therefore, it is possible to obtain proper characteristics. Of course, the incident angle and the reflection angle θ are not limited to 10 degrees.

<Modification of the first embodiment>

  FIG. 5 shows an example of the possibility of modification of the first embodiment described above. In FIG. 5, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the multiplexing / demultiplexing module 100A shown in FIG. 5, the optical waveguide layer 102A is composed of only the region on the left side of the optical waveguide layer 102 shown in FIG. A multilayer filter plate 104 is attached to the right end face in the figure of the multiplexing / demultiplexing module 100A. The multiplexing / demultiplexing module 100A having such a configuration performs exactly the same optical behavior as the multiplexing / demultiplexing module 100 shown in FIG.

  In the case of the multiplexing / demultiplexing module 100 shown in the first embodiment, the multilayer filter plate 104 is not attached to the slit 103 by adjusting the widths of the slit 103 and the multilayer filter plate 104. Both can be optically coupled. The multilayer filter plate 104 of the first embodiment shown in FIG. 1 and the multilayer filter plate 104 of the modification of the first embodiment shown in FIG. In such a case, it is desirable to use an adhesive with little optical loss.

<Second Embodiment>

FIG. 6 shows a multiplexing / demultiplexing module according to the second embodiment of the present invention. The multiplexing / demultiplexing module 200 is obtained by laminating an optical waveguide layer 202 on a substrate, similarly to the multiplexing / demultiplexing module 100 according to the first embodiment shown in FIG. The optical waveguide layer 202, incident on the waveguide 205 _{0, 1} first and second output waveguide 205, 205 ₂ is formed as a core. Further, the right end in the diagram the input waveguide 205 _0, the boundary position of the left end side in the first and second output waveguide 205 _1, 205 ₂ of FIG, slit 203 is cut. The side in contact with the input waveguide 205 ₀ in the slit 203, the multilayer film filter plate 204 is bonded. The bottom of the slit 203 is deeper than the position of the clad constituting the optical waveguide layer 202 and reaches the substrate 201 (see FIG. 1).

The incident waveguide 205 ₀ is continuous with the parallel waveguide portion 211 ₀ parallel to the longitudinal direction of the optical waveguide layer 202 having a rectangular shape as a whole, and the end of the parallel waveguide portion 211 ₀ on the side where the slit 203 is disposed. and and is configured at an angle other than perpendicular to the multilayer film filter plate 204 from the inclined guide portion 212 ₀ changing its traveling direction so that the optical signal is incident. The first output waveguide 205 ₁ is continuous with the parallel waveguide portion 211 ₁ parallel to the parallel waveguide portion 211 ₀ and the end of the parallel waveguide portion 211 ₁ on the side where the slit 203 is disposed. and and a tilted waveguide sections 212 ₀ parallel inclined waveguide portion 212 _1. Left end in FIG inclined waveguide portion 212 ₁ is in contact with the side surface of the right end side in FIG slit 203, or facing. The second output waveguide 205 ₂ is also continuous with the parallel waveguide portion 211 ₂ parallel to the parallel waveguide portion 211 ₀ and the end of the parallel waveguide portion 211 ₂ on the side where the slit 203 is disposed, and and a tilted waveguide sections 212 ₀ parallel inclined waveguide portion 212 _2. Left end in FIG inclined waveguide portion 212 ₂ is likewise in contact with the side surface of the right end side in FIG slit 203, or facing.

As described above, the multiplexing / demultiplexing module 200 according to the present embodiment is different from the multiplexing / demultiplexing module 100 according to the first embodiment only in the arrangement of the waveguides. However, in the case of this embodiment, it is necessary to increase the width of the slit 203 as the thickness of the multilayer filter plate 204 increases. This increases the coupling loss when coupling from the incident waveguide 205 ₀ to the first and second output waveguides 205 ₁ and 205 ₂ . In order to reduce this coupling loss as much as possible, it is desirable to make the multilayer filter plate 204 as thin as possible.

FIG. 7 corresponds to FIG. 3 and schematically shows that an optical signal is reflected in multiple layers within the multilayer filter according to the wavelength. Input waveguide 205 inclined guide portion 212 ₀ from the first and second wavelengths lambda ₁ of ₀ shown in FIG. 6, is incident on lambda ₂ of the optical signal to the multi-layer filter plate 204. Then, the optical signal of the first wavelength λ ₁ is reflected relatively lightly inside the multilayer filter plate 204. As a result, the optical signal having the first wavelength λ ₁ is emitted from the position Q ₁ slightly away from the position Q ₀ where the optical signal emitted from the inclined waveguide portion 212 ₀ goes straight through the multilayer filter plate 204 and is emitted. Then, the light enters the inclined waveguide portion 212 ₁ of the first output waveguide 205 ₁ having one end disposed at this position. In contrast, the optical signal having the second wavelength λ ₂ is reflected relatively much inside the multilayer filter plate 204. As a result, an optical signal having the second wavelength λ ₂ is emitted from a position Q ₂ that is relatively far from the position Q _0, and the inclined waveguide of the second emission waveguide 205 ₂ having one end disposed at this position. The light enters the waveguide portion 212 ₂ .

  As described above, also in the case of the second embodiment, the wavelength dependence of the group delay amount of the optical signal transmitted through the multilayer filter is measured, and the output of the optical signal transmitted through the multilayer filter is correspondingly measured. By setting the optical signal extraction position on the surface, an optical signal having a desired wavelength can be separated and extracted from these positions. In addition, low loss characteristics can be obtained as the multiplexing / demultiplexing module 200.

  Note that when the multilayer filter is used as a reflection filter as in the first embodiment, the wavelength of the optical signal to be selectively acquired needs to use a wavelength range in which light does not pass through the multilayer filter. There is. On the other hand, when the multilayer filter is used as a transmission filter as in the second embodiment, the wavelength of the optical signal to be selectively acquired is the wavelength range in which light is transmitted by the multilayer filter. Need to use.

<Third Embodiment>

FIG. 8 shows a multiplexing / demultiplexing module according to the third embodiment of the present invention. This multiplexing / demultiplexing module 300 is obtained by forming an optical waveguide layer 302 on a substrate in the same manner as the multiplexing / demultiplexing module 100 according to the first embodiment shown in FIG. In the optical waveguide layer 302, first to fourth waveguides 305 _{1 to} 305 ₄ are formed as cores. Among these, between the right end side in the drawing of the _{first to third} waveguides 305 _{1 to} 305 ₃ and the left end side in the drawing of the _fourth waveguide 3054, there is an optical waveguide layer 302 having a rectangular shape as a whole. A slit 303 is cut in the short direction. The bottom of the slit 303 is deeper than the position of the clad constituting the optical waveguide layer 302 and reaches the substrate 301 (see FIG. 1).

A multilayer filter plate 304 is disposed inside the slit 303 and is bonded to the right end face in each of the _{first to third} waveguides 305 _{1 to} 305 ₃ . The left end face of the _first waveguide 3051 is optically connected to the optical fiber 321. The left end face of the _second waveguide 3052 is optically connected to a first light receiving element 322 that receives a digital data signal. The left end face of the _third waveguide 3053 is optically connected to the second light receiving element 323. The right end side of the _fourth waveguide 3054 in the drawing is optically connected to the light emitting element 324 formed on the substrate 301.

The first to fourth waveguides 305 _{1 to} 305 ₄ include first to fourth inclined waveguide portions 312 _{1 to} 312 ₄ that optically connect one end to the multilayer filter plate 304, respectively. Here, the inclination angle of the first to third inclined waveguide portions 312 _{1 to} 312 ₃ and the positional relationship with the surface of the multilayer filter plate 304 are the inclined waveguide portions 112 _{0 to} 112 ₂ shown in FIG. The relationship is similar to that of the multilayer filter plate 104. The positional relationship between the first inclined guide portion 312 ₁ and the fourth inclined guide portion 312 ₄ of tilt angle and multilayer surface of the filter plate 304 includes an inclined guide portion 212 ₀ shown in FIG. 6 The relationship is the same as that of the inclined waveguide portion 212 ₁ .

  The multiplexing / demultiplexing module 300 of the third embodiment is used as a FTTH triplexer. The wavelength used in the triplexer is defined by the International Standardization Committee. The light emitting element 324 constitutes a transmitter for transmitting a digital data signal of an optical signal from the optical fiber 321 at a wavelength of 1260 to 1360 nm (nanometer). The first light receiving element 322 receives a 1480 to 1500 nm digital data signal incident from the optical fiber 321. The second light receiving element 323 receives a video signal of 1550 nm to 1560 nm incident from the optical fiber 321.

  In the related art of the present invention, two filters are used for the FTTH triplexer. However, according to the multiplexing / demultiplexing module 300 of the present embodiment, only one multilayer filter plate 304 may be used. In the present embodiment, the group delay may be different between the wavelength of the optical signal used in the first light receiving element 322 and the wavelength of the optical signal used in the second light receiving element 323. For the light emitting element 324, the wavelength of the light emitting element 324 may be reduced in the transmission characteristics of the multilayer filter plate 304.

<Modification of Third Embodiment>

  9 and 10 show various modifications to the third embodiment of the present invention. 9 and 10, the same parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

Demultiplexing module 300A shown in FIG. 9, nor demultiplexing module 300B shown in FIG. 10, the optical fiber 321, the first arrangement itself of the waveguides 305 ₁ optically coupled to this, FIG. 8 The same as the embodiment shown in FIG. In the case of the multiplexing / demultiplexing module 300A shown in FIG. 9, the light emitting element 324 is arranged on the side of the optical waveguide layer 302A where the optical fiber 321 is attached, with the multilayer filter plate 304A as a boundary. A first light receiving element 322 and a second light receiving element 323 are arranged on the opposite side of the multilayer filter plate 304A.

In the case of the modification shown in FIG. 9, the digital data signal output from the light emitting element 324 is reflected by the multilayer filter plate 304A, enters the _first waveguide 3051, and is sent out to the optical fiber 321. . The digital data signal sent from the optical fiber 321 to the first waveguide 305 ₁ is transmitted through the multilayer filter plate 304 A, enters the _second waveguide 305 ₂ A, and is received by the first light receiving element 322. Received. The video signal transmitted from the optical fiber 321 to the first waveguide 305 ₁ is transmitted through the multilayer filter plate 304A, enters the _third waveguide 305 3A, and enters the second light receiving element 323. Received at.

  On the other hand, also in the multiplexing / demultiplexing module 300B shown in FIG. 10, the light emitting element 324 is arranged on the side where the optical fiber 321 of the optical waveguide layer 302B is attached with the multilayer filter plate 304B as a boundary. However, unlike the multiplexing / demultiplexing module 300A shown in FIG. 9, the second light receiving element 323 is arranged on the side of the optical waveguide layer 302B where the optical fiber 321 is attached.

Figure in the case of demultiplexing module 300B shown in 10, the video signal from the optical fiber 321 has been sent to the first waveguide 305 _1, the third waveguide 305 and reflects the multilayer filter plate 304B ₃ is incident on B and incident on the second light receiving element 323 arranged at the other end.

  It goes without saying that various modifications other than the modification examples shown in FIGS. 9 and 10 are possible. Moreover, it is natural that the multiplexing / demultiplexing module of the present invention described above is not limited to FTTH.

  In each of the embodiments and the modified examples, the case where optical signals having different wavelengths are demultiplexed has been mainly described. However, it goes without saying that optical signals having different wavelengths can be multiplexed according to the present invention. Nor. Further, in each of the embodiments and the modifications thereof, the signal demultiplexing module has been described as an example, but the present invention is similarly applied to an optical device having only a multiplexing or demultiplexing or an optical device having no module structure. Can be applied to.

1A and 1B are schematic views of a multiplexing / demultiplexing module according to a first embodiment of the present invention, where FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line A-A. It is the characteristic view which showed an example of the wavelength dependence of the group delay amount of the optical signal reflected from the multilayer filter. It is explanatory drawing which showed typically that an optical signal is reflected in the deeper position of a multilayer filter with a wavelength by 1st Embodiment. It is explanatory drawing which showed the group delay amount in 1st Embodiment, and the optimal space | interval of the incident side and the output waveguide. It is a typical top view of the multiplexing / demultiplexing module in the modification of 1st Embodiment. It is a typical top view of the multiplexing / demultiplexing module by the 2nd Embodiment of this invention. It is explanatory drawing which showed typically that an optical signal is reflected in multiple inside a multilayer filter according to a wavelength in 2nd Embodiment. It is a typical top view of the multiplexing / demultiplexing module by the 3rd Embodiment of this invention. It is a typical top view which shows the 1st deformation | transformation of the multiplexing / demultiplexing module with respect to 3rd Embodiment. It is a typical top view which shows the 2nd deformation | transformation of the multiplexing / demultiplexing module with respect to 3rd Embodiment.

Explanation of symbols

100, 100A, 200, 300, 300A, 300B MUX / DEM module 101, 201, 301 Substrate 102, 102A, 202, 302 Optical waveguide layer 103, 203, 303 Slit 104, 204, 304, 304A, 304B Multilayer filter plate 105 _0, 205 ₀ input waveguide 105 _1, 205 ₁ first output waveguide 105 _2, 205 ₂ second output waveguide 112, 212, 312 (the input port or output port of the optical signal) inclined waveguide section
305 ₁ 1st waveguide 305 ₂ 2nd waveguide 305 ₃ 3rd waveguide 305 ₄ 4th waveguide 321 Optical fiber 322 1st light receiving element 323 2nd light receiving element 324 Light emitting element

Claims (9)

A substrate,
A multilayer filter suspended from the upper surface in a form protruding at least a predetermined length from a predetermined position on the upper surface of the substrate;
An incident waveguide that is formed in an optical waveguide layer laminated on the upper surface of the substrate and that makes an optical signal incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter;
An optical signal which is formed in the optical waveguide layer independently of the incident waveguide and is emitted from the multilayer filter at the same reflection angle as the predetermined incident angle at one or a plurality of positions different from the incident position. And one or a plurality of reflection type output waveguides that individually receive the optical device. A substrate,
An optical waveguide layer laminated on the upper surface of the substrate;
A multilayer filter fixed to an end surface of the substrate including the optical waveguide layer so that the incident surface thereof is parallel;
An incident waveguide that is formed in the optical waveguide layer and that makes an optical signal incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter;
An optical signal which is formed in the optical waveguide layer independently of the incident waveguide and is emitted from the multilayer filter at the same reflection angle as the predetermined incident angle at one or a plurality of positions different from the incident position. And one or a plurality of reflection type output waveguides that individually receive the optical device. A substrate,
A multilayer filter suspended from the upper surface in a form protruding at least a predetermined length from a predetermined position on the upper surface of the substrate;
An incident waveguide that is formed in an optical waveguide layer laminated on the upper surface of the substrate and that makes an optical signal incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter;
The optical waveguide layer is formed independently of the incident waveguide, and has the same incident angle as the predetermined incident angle from the multilayer filter at one or a plurality of positions on the exit surface opposite to the incident surface of the multilayer filter. An optical device comprising one or a plurality of transmissive emission waveguides that individually receive optical signals emitted at an emission angle. A substrate,
A multilayer filter suspended from the upper surface in a form protruding at least a predetermined length from a predetermined position on the upper surface of the substrate;
An incident waveguide that is formed in an optical waveguide layer laminated on the upper surface of the substrate and that makes an optical signal incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident position of the multilayer filter;
An optical signal which is formed in the optical waveguide layer independently of the incident waveguide and is emitted from the multilayer filter at the same reflection angle as the predetermined incident angle at one or a plurality of positions different from the incident position. One or more reflective exit waveguides that individually receive
The optical waveguide layer is formed independently of the incident waveguide, and has the same output angle as the predetermined incident angle from the multilayer filter at one or a plurality of positions on the output surface opposite to the incident surface of the multilayer filter. An optical device comprising one or a plurality of transmissive emission waveguides that individually receive optical signals emitted at corners.   5. The optical device according to claim 1, further comprising: an optical signal transmission unit configured to transmit or reflect the multilayer filter and transmit an optical signal to the incident waveguide.   The optical device according to claim 1, wherein the multilayer filter is a dielectric multilayer filter, and a group delay amount at the time of reflection or transmission varies depending on the wavelength.   5. The multilayer filter according to claim 1, wherein the multilayer filter is a filter plate fitted in a slit obtained by cutting an optical waveguide layer laminated on an upper surface of the substrate with a predetermined width. The optical device described.   In a state in which an optical signal is incident on the multilayer filter from the incident waveguide formed in the optical waveguide layer at a predetermined incident angle other than 90 degrees, the reflection angle equal to the incident angle on the reflective surface of the multilayer filter A method for selecting an optical signal, comprising: extracting reflected light reflected by the optical signal as an optical signal having a wavelength component corresponding to a change in position at a position different from an incident position.   In a state where an optical signal is incident on the multilayer filter at a predetermined incident angle other than 90 degrees from the incident waveguide formed in the optical waveguide layer, the incident angle and A method for selecting an optical signal, comprising: extracting transmitted light emitted at an equal reflection angle as an optical signal having a wavelength component corresponding to a change in the outgoing position.

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