CN203301489U

CN203301489U - Light emitting device possessing multipath wavelength channels, light receiving element possessing multipath wavelength channels and optical module

Info

Publication number: CN203301489U
Application number: CN2013203976191U
Authority: CN
Inventors: 陈思乡
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2013-07-05
Filing date: 2013-07-05
Publication date: 2013-11-20
Anticipated expiration: 2023-07-05

Abstract

The utility model discloses a light emitting device possessing multipath wavelength channels, a light receiving element possessing multipath wavelength channels and an optical module. The light emitting device possessing the multipath wavelength channels is equipped with a laser assembly, a laser collimating lens assembly, an integrated film filter plate module and a focusing coupling lens, and the light receiving element possessing the multipath wavelength channels is equipped with a collimating lens, an integrated film filter plate module, a focusing coupling lens assembly and a photoelectric detector assembly. According to the utility model, an integrated WDM module is used to substitute a conventional split WDM diaphragm to gather the N light beams of different wavelengths emitted by N lasers or separate the light signals containing various wavelengths and accessed in a fiber, so that the multichannel transmission requirement of signals can be satisfied, the change of the relative positions among diaphragms is limited and reduced, the light path is stabilized, and the insertion loss caused by the change of the light path along with environments can be reduced effectively. In addition, the light beam displacement prisms are introduced in the devices, so that the input/output light paths can be located in the centers of the devices, and accordingly, the light path offset problem is solved, and the package of the devices becomes simpler and more convenient.

Description

Light emitting device, light receiving device and optical module with multiple wavelength channels

Technical Field

The utility model belongs to the technical field of optical communication system, specifically speaking relates to a light receiving device and light emitting device and light receiving/sending integrative module for receiving or transmitting optical signal.

Background

In the field of high-speed data communication, for an optical fiber communication network requiring a transmission rate of 40Gbps or more and a reception rate of 100Gbps or more, in order to ensure that data can be transmitted at a high speed over a long distance, a commonly adopted solution is to multiplex/demultiplex 4 optical signals with different wavelengths into a single mode optical fiber for transmission. Thus, the signal rate of each wavelength channel only needs to reach 10/25Gbps (namely, the transmission rate is more than 10Gbps, and the receiving rate is more than 25 Gbps), and the signal transmission rate of 40/100Gbps can be met. An 40/100Gbps optical signal transceiver module includes both a TOSA (transmitter optical component or package) with such a 4-wavelength and a ROSA (receiver optical component or package) with such a 4-wavelength.

At present, two designs are mainly adopted for a transmitter/receiver optical assembly (TOSA/ROSA) with four wavelength channels:

one is a design scheme based on Planar Lightwave Circuit (PLC), that is, PLC type Array Waveguide Grating (AWG) is adopted to multiplex/demultiplex lightwave signals with four wavelengths to form TOSA/ROSA; or a PLC type optical fiber synthesizer Combiner is adopted to multiplex light wave signals with four wavelengths to form the TOSA. The disadvantages of this design are: the arrayed waveguide grating AWG has larger loss and poorer temperature stability, and the passband width is narrower; the Combiner has larger physical loss, and thus easily causes the output power of the optical signal to decrease.

The other is a design scheme based on a thin film filter technology (WDM), and a structural design scheme as shown in fig. 1 and fig. 2 is generally adopted. Fig. 1 is a structural design scheme of a TOSA, which mainly includes a substrate 170, a focusing coupling lens 110, a reflector 120, a WDM assembly 130 (the WDM assembly 130 includes 4

wavelength diaphragms

1301, 1302, 1303, 1304 for transmitting light wave signals with 4 wavelengths, respectively), a collimating lens assembly 140, and a laser assembly 150. There are 4

lasers

1501, 1502, 1503 and 1504 arranged in the laser assembly 150 for emitting laser beams with four different wavelengths respectively. The laser beam emitted from the laser assembly 150 is collimated by the lens 140 and enters the WDM assembly 130, and is reflected and converged into one beam by the mirror 120, and is coupled into the optical fiber after being focused by the lens 110.

As for the optical receiver ROSA, as shown in fig. 2, an input light beam from an optical fiber enters the WDM assembly 130 through the collimating lens 180, is reflected multiple times by the mirror 120, and then is incident on the 4

wavelength diaphragms

1301, 1302, 1303, 1304 of the WDM assembly 130, and is further separated into 4 light beams with different wavelengths through the 4

wavelength diaphragms

1301, 1302, 1303, 1304, and then is focused on the four

PD photodetectors

1601, 1602, 1603, 1604 in the PD assembly 160 by the focusing lens assembly 190, and the four optical signals are converted into four electrical signals by the

PD photodetectors

1601, 1602, 1603, 1604, thereby achieving data reception. The above components are fixed to the substrate 170 of the light receiving device ROSA.

The design scheme based on the WDM technology has the following disadvantages: the input and output light beams are deviated from the central position of the light receiving/transmitting device, thereby causing inconvenience in the assembly of the device. In addition, since the WDM assembly 130 is designed using a separate WDM film, its relative position to the mirror 120 is easily changed with changes in temperature and environmental conditions, and thus the performance of the optical transceiver device becomes unreliable.

Disclosure of Invention

The utility model discloses an improve optical device's performance, at first proposed the optical transmission device who has multichannel wavelength channel that adopts the design of the WDM module of integration to make the transmission path of light beam more stable, reliable.

In order to solve the technical problem, the utility model discloses a following technical scheme realizes:

a light emitting device with multiple wavelength channels comprises a laser component, a laser collimating lens component, an integrated thin film filter module and a focusing coupling lens; the laser module is provided with N lasers, the laser collimating lens module is provided with N laser collimating lenses, the thin film filter module is provided with a glass body, the glass body is provided with N bandpass thin film filters and a reflecting membrane, the N bandpass thin film filters are arranged adjacent to the laser collimating lenses, and the reflecting membrane is arranged adjacent to the focusing coupling lens; n laser beams with different wavelengths emitted by N lasers are respectively and correspondingly injected into the N bandpass thin film filters through N laser collimating lenses, are reflected and converged into a beam through a reflecting membrane, and are coupled into an optical fiber after being focused through a focusing coupling lens.

Furthermore, the N band-pass thin film filters have the characteristics of transmitting incident light with specific wavelength and reflecting incident light with other wavelengths, each band-pass thin film filter transmits light beams with different wavelengths, and the interval of the N wavelengths accords with the regulations of the International telecommunication Union ITU on coarse wavelength division multiplexing and dense wavelength division multiplexing.

In order to make the packaging operation of the light emitting device simpler and more convenient, a light beam displacement prism is arranged between the focusing coupling lens and the optical fiber, the light beam output by the focusing coupling lens enters the light beam displacement prism, and the light beam displacement prism changes the transmission path of the light beam to the position of the optical fiber mounted on the light emitting device, so that the light beam vertically enters the optical fiber.

Preferably, the beam displacement prism is a glass prism, antireflection films are plated on an incident surface and an exit surface of the glass prism, and total internal reflection surfaces are formed on two opposite side end surfaces of the glass prism.

Following the above design concept, the present invention further provides an optical receiving device with multiple wavelength channels and adopting an integrated WDM module design, comprising a photodetector assembly, a focusing coupling lens assembly, an integrated thin film filter module and a collimating lens; the photoelectric detector assembly is internally provided with N photoelectric detectors, the focusing coupling lens assembly is internally provided with N focusing coupling lenses, the thin film filter module is internally provided with a glass body, the glass body is provided with N band-pass thin film filters and a reflecting membrane, the N band-pass thin film filters are arranged adjacent to the focusing coupling lenses, and the reflecting membrane is arranged adjacent to the collimating lenses; the optical signals input through the optical fibers are incident into the thin film filter module through the collimating lens, are divided into N paths of optical signals with different wavelengths through the thin film filter module, are incident into the N focusing coupling lenses in a one-to-one correspondence mode, are respectively coupled into the N photoelectric detectors through the focusing coupling lenses, and are converted to generate electric signals.

Furthermore, the N band-pass thin film filters have the characteristics of transmitting incident light with specific wavelength and reflecting incident light with other wavelengths, each band-pass thin film filter transmits light beams with different wavelengths, and the interval of the N wavelengths accords with the regulation of ITU on coarse wavelength division multiplexing and dense wavelength division multiplexing.

In order to further simplify the packaging operation of the light receiving device, a light beam displacement prism is arranged between the optical fiber and the collimating lens, and the transmission path of the optical signal input through the optical fiber is changed to the mounting position of the collimating lens through the light beam displacement prism, so that the optical signal vertically enters the collimating lens.

Based on the light emitting device and the light receiving device, the utility model also provides an optical module, namely a light receiving/emitting integrated module, which comprises the light emitting device and the light receiving device; wherein,

the light emitting device is provided with a laser component, a laser collimating lens component, an integrated thin film filter module and a focusing coupling lens; the laser module is provided with N lasers, the laser collimating lens module is provided with N laser collimating lenses, the thin film filter module is provided with a glass body, the glass body is provided with N bandpass thin film filters and a reflecting membrane, the N bandpass thin film filters are arranged adjacent to the laser collimating lenses, and the reflecting membrane is arranged adjacent to the focusing coupling lens; n paths of laser beams with different wavelengths emitted by N lasers are respectively and correspondingly emitted into the N bandpass thin-film filters through N laser collimating lenses, are reflected and converged into a beam through a reflecting membrane, and are coupled into an optical fiber after being focused by a focusing coupling lens;

the light receiving device is provided with a photoelectric detector assembly, a focusing coupling lens assembly, an integrated thin film filter module and a collimating lens; the photoelectric detector assembly is internally provided with N photoelectric detectors, the focusing coupling lens assembly is internally provided with N focusing coupling lenses, the thin film filter module is internally provided with a glass body, the glass body is provided with N band-pass thin film filters and a reflecting membrane, the N band-pass thin film filters are arranged adjacent to the focusing coupling lenses, and the reflecting membrane is arranged adjacent to the collimating lenses; the optical signals input through the optical fibers are incident into the thin film filter module through the collimating lens, are divided into N paths of optical signals with different wavelengths through the thin film filter module, are incident into the N focusing coupling lenses in a one-to-one correspondence mode, are respectively coupled into the N photoelectric detectors through the focusing coupling lenses, and are converted to generate electric signals.

Preferably, N is equal to 4, i.e. an optical transceiver module with 4 wavelength channels is formed.

Compared with the prior art, the utility model discloses an advantage is with positive effect:

1. the utility model adopts the integrated WDM module to replace the traditional discrete WDM diaphragm design light receiving/transmitting device, which not only limits and reduces the change of the relative position between the diaphragms, stabilizes the light path, but also can effectively reduce the insertion loss caused by the change of the light path along with the environment;

2. the introduction of the light beam displacement prism enables the input/output light path to be positioned at the central position of the light receiving/transmitting device, thereby not only effectively utilizing the space and reducing the packaging volume of the device, but also solving the problem of light path offset and enabling the device packaging to be simpler and more convenient;

3. compared with the traditional PLC technical scheme, the loss of the WDM membrane is much less than that of the PLC, so the optical path loss can be reduced and the optical output power of the light receiving/transmitting device can be improved by adopting the integrated WDM module.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a schematic diagram of an optical path structure of a prior art optical transmission device designed by WDM technology;

FIG. 2 is a schematic diagram of an optical path structure of a prior art optical receiving device designed by WDM technology;

fig. 3 is a schematic diagram of an optical path structure of a first embodiment of the light emitting device of the present invention;

fig. 4 is a schematic diagram of an optical path structure of a first embodiment of the light receiving device of the present invention;

fig. 5 is a schematic diagram of an optical path structure of a second embodiment of the light emitting device of the present invention;

fig. 6 is a schematic view of an optical path structure of a second embodiment of the light receiving device of the present invention;

fig. 7 is a schematic view of an optical path structure of a third embodiment of the light emitting device of the present invention;

fig. 8 is a schematic view of an optical path structure of a third embodiment of the light receiving device proposed by the present invention;

fig. 9 is a schematic view of an optical path structure of a fourth embodiment of the light emitting device proposed by the present invention;

fig. 10 is a schematic view of an optical path structure of a fourth embodiment of the light receiving device of the present invention.

Detailed Description

The technical solution in the embodiment of the present invention is clearly and completely described below with reference to the drawings in the embodiment of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In order to make the advantages of the technical solutions of the present invention clearer, the present invention will be described in detail with reference to the accompanying drawings and embodiments.

In order to solve the problem that the performance of the conventional optical transceiver is unreliable due to the fact that the conventional optical transceiver is designed by adopting a discrete WDM film and the relative position between the WDM film and the reflector is easy to change along with the change of temperature and environmental conditions, the embodiment provides an optical transmitter and an optical receiver which are designed by adopting an integrated WDM module, so as to improve the stability and reliability of a light beam transmission path.

The specific construction of the light emitting device and the light receiving device is described in detail below with reference to a specific embodiment.

First, a specific structure of the light emitting device is described, and as shown in fig. 3, the light emitting device mainly includes a laser assembly 350, a laser collimating lens assembly 340, an integrated thin film filter module (i.e., WDM module) 330, and a focusing coupling lens 320. In the embodiment, N lasers are disposed in the laser assembly 350, and N =4 is taken as an example for explanation, that is, 4 wavelength channels are disposed in the light emitting device, and 4 laser beams with different wavelengths are emitted by the 4

lasers

3501, 3502, 3503, and 3504 and are incident into the laser collimating lens assembly 340. In order to collimate the laser beams emitted by each of the

lasers

3501, 3502, 3503, and 3504, in this embodiment, the laser collimating lens assembly 340 is provided with the same number of laser collimating lenses as the lasers, that is, N laser collimating lenses, and the description is still given by taking N =4 as an example. The laser beams emitted by different lasers correspondingly enter different laser collimating lenses, and after 4 paths of laser beams with different wavelengths are collimated by the 4 laser collimating lenses, the laser beams enter the thin film filter module 330.

The thin film filter module 330 of the present embodiment is an integrated structure, and includes a glass body 3301, N bandpass thin film filters (TFF membranes) 3302, and a reflective membrane 3303, as shown in fig. 3. The number of the TFF patches 3302 is the same as the number of the lasers, and N =4 is still used as an example for explanation. In the present embodiment, the 4 TFF membranes 3302 each have the characteristics of transmitting incident light with a specific wavelength and reflecting incident light with the rest wavelengths, each TFF membrane 3302 transmits light beams with different wavelengths, for example, transmits light beams with four wavelengths of 1271nn, 1291nm, 1311nm and 1331nm, respectively, and the intervals between the wavelengths should meet the requirements of the International Telecommunication Union (ITU) for coarse wavelength division multiplexing and dense wavelength division multiplexing.

An antireflection film is coated on the incident surface and the exit surface of the glass body 3301, and the TFF film 3302 is disposed on the glass body 3301 adjacent to the laser collimating lens assembly 340, and referring to fig. 3, the reflective film 3303 is disposed on the glass body 3301 adjacent to the focusing coupling lens 320. The reflecting film 3303 is a mirror coated with a high reflection film in a prescribed area.

4 laser beams with different wavelengths emitted by the 4

lasers

3501, 3502, 3503, 3504 are collimated by the 4 laser collimating lenses respectively and enter the 4 TFF patches 3302, and each TFF patch 3302 transmits a light beam with one wavelength and reflects light beams with the other wavelengths. The 4 light beams with different wavelengths transmitted to the glass body 3301 through the 4 TFF membranes 3302 are reflected by the reflection membrane 3303 and converged into one light beam, which is emitted to the focusing coupling lens 320, focused by the focusing coupling lens 320 and coupled into an optical fiber to complete the TOSA function.

Since the optical fiber is installed at the middle position of the light emitting device, the light emitting device is further provided with a beam displacement prism 310 for changing the transmission path of the light beam, as shown in fig. 3, so that the light beam emitted through the focusing coupling lens 320 is vertically coupled into the optical fiber, thereby increasing the optical transmission power of the device.

In this embodiment, the beam displacement prism 310 is preferably made of a glass prism, the incident surface and the exit surface of the glass prism are respectively coated with antireflection films, and two opposite side end surfaces (for example, an upper side end surface and a lower side end surface) of the glass prism are polished to form an internal total reflection surface, so as to change the transmission path of the incident beam.

In order to facilitate the fixation of the components, a substrate 170 is further disposed in the light emitting device, and as shown in fig. 3, the laser assembly 350, the laser collimating lens assembly 340, the thin film filter module 330, the focusing coupling lens 320, and the beam shifting prism 310 are all fixed on the substrate 170.

Next, a specific structure of the light receiving device is described, and as shown in fig. 4, the light receiving device mainly includes a photodetector assembly 360, a focusing coupling lens assembly 345, an integrated thin film filter module 330, and a collimating lens 325. In order to increase the receiving rate, the present embodiment has N photodetectors in the photodetector assembly 360, and the present embodiment is described by taking N =4 as an example, that is, 4 wavelength channels are provided in the light receiving device, and 4 optical signals with different wavelengths are received by the 4

photodetectors

3601, 3602, 3603, and 3604, respectively, and then converted into 4 electrical signals, so as to implement high-speed data reception.

The focusing coupling lens assembly 345 includes N focusing coupling lenses, which are the same as the number of photodetectors, and is also described with N =4 as an example. Thin film filter module 330 is disposed between focusing coupling lens assembly 345 and collimating lens 325, said thin film filter module 330 has the same structure as the thin film filter module in fig. 3, and N bandpass thin film filters 3302 are disposed on glass body 3301 at the position adjacent to focusing coupling lens assembly 345, and reflective film 3303 is disposed on glass body 3301 at the position adjacent to collimating lens 325, as shown in fig. 4.

An optical signal (optical signal having 4 wavelengths) input through the optical fiber is collimated by the collimating lens 325 and then enters the thin film filter module 330. The optical signal firstly transmits to a first TFF film, a light beam with a wavelength consistent with the transmission wavelength of the first TFF film in the optical signal is transmitted through the first TFF film and then transmits to a first focusing coupling lens in the focusing coupling lens assembly 345, and light beams with the rest wavelengths are reflected to the reflecting surface of the reflecting film 3303 and further reflected to a second TFF film through the reflecting film 3303. The second TFF film transmits the light beam of the optical signal with the wavelength consistent with the transmission wavelength of the second TFF film, and the light beam is emitted to the second focusing and coupling lens in the focusing and coupling lens assembly 345, and the light beam with the rest wavelength is reflected to the reflective film 3303, and further reflected to the third TFF film through the reflective film 3303. By analogy, an optical signal containing 4 wavelengths is separated into 4 light beams with different wavelengths under the transmission and reflection effects of the four TFF diaphragms 3302 and the reflection diaphragm 3303, and the light beams are transmitted and output to the four focusing coupling lenses through the four TFF diaphragms 3302, and then focused by the 4 focusing coupling lenses, and correspondingly coupled into the 4 photodetectors 3601 to 3604 to be converted into 4 electrical signals, and transmitted to a circuit board at a later stage, so that the ROSA function is completed.

Also, in order to reduce the size of the light receiving device and solve the problem of optical path deviation, so that the device packaging becomes simpler and more convenient, the present embodiment also provides a beam shifting prism 310 in the light receiving device, as shown in fig. 4. The structure of the beam displacement prism 310 is the same as that of the beam displacement prism in fig. 3, and is disposed between the optical fiber and the collimating lens 325, and an optical signal input through the optical fiber is transmitted along the central position of the light receiving device, and after the transmission path of the optical signal is changed by the beam displacement prism 310, the optical signal is emitted to the installation position of the collimating lens 325, so that the optical signal can be vertically incident into the collimating lens 325, and the transmission power of the optical signal is improved.

The light receiving device is also provided with a substrate 170, as shown in fig. 4, for fixing the above-mentioned photodetector assembly 360, focusing coupling lens assembly 345, integrated thin film filter module 330, collimating lens 325 and beam shifting prism 310.

Fig. 5, 7 and 9 respectively illustrate three other light emitting devices based on integrated thin film filter module designs, and the optical path structure is identical to that of the light emitting device shown in fig. 3, except for the relative positions of the reflective membrane and the TFF membrane in the thin film filter module, that is: the reflective membrane 4303 and the TFF membrane 4302 in FIG. 5 are both disposed at the middle of the glass body 4301, and the distance between the membranes is relatively short; the reflective film 5303 in fig. 7 is provided at a position near the center of the glass body 5301, and the TFF film 5302 is provided at a position near the right end face of the glass body 5301; the reflective membrane 6303 in fig. 9 is provided at a position on the left end face of the glass body 6301, and the TFF membrane 6302 is provided at a position on the middle of the glass body 6301.

Similarly, fig. 6, 8 and 10 respectively illustrate three other light receiving devices based on integrated thin film filter module designs, and the light path structure is identical to that of the light receiving device shown in fig. 4, except for the relative positions of the reflective membrane and the TFF membrane in the thin film filter module, that is: the reflective membrane 4303 and the TFF membrane 4302 in FIG. 6 are both disposed at the middle of the glass body 4301, and the distance between the membranes is relatively short; the reflective film 5303 in fig. 8 is provided at a position near the center of the glass body 5301, and the TFF film 5302 is provided at a position near the right end face of the glass body 5301; the reflective membrane 6303 in fig. 10 is provided at a position on the left end face of the glass body 6301, and the TFF membrane 6302 is provided at a position on the middle of the glass body 6301.

The optical path building structure and the operation principle of the light receiving device and the light emitting device of the other three embodiments can refer to the description of the embodiment with reference to fig. 3 and fig. 4, and the embodiment will not be further described here.

The optical receiving device and the optical transmitting device provided by the embodiment are integrated together, so that an optical receiving/transmitting integrated module can be formed, 4 paths (or any other number of paths) of wavelength channels are provided for transmission of optical signals, and the design requirement of an access network for 40/100Gbps high-speed data communication is met.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.

Claims

1. A light emitting device having multiple wavelength channels, characterized by: the laser device comprises a laser component, a laser collimating lens component, an integrated thin film filter module and a focusing coupling lens; the laser module is provided with N lasers, the laser collimating lens module is provided with N laser collimating lenses, the thin film filter module is provided with a glass body, the glass body is provided with N bandpass thin film filters and a reflecting membrane, the N bandpass thin film filters are arranged adjacent to the laser collimating lenses, and the reflecting membrane is arranged adjacent to the focusing coupling lens; n laser beams with different wavelengths emitted by N lasers are respectively and correspondingly injected into the N bandpass thin film filters through N laser collimating lenses, are reflected and converged into a beam through a reflecting membrane, and are coupled into an optical fiber after being focused through a focusing coupling lens.

2. The light emitting device with multiple wavelength channels of claim 1, wherein: the N band-pass thin-film filters have the characteristics of transmitting incident light with specific wavelength and reflecting incident light with other wavelengths, each band-pass thin-film filter transmits light beams with different wavelengths, and the interval of the N wavelengths accords with the regulation of ITU on coarse wavelength division multiplexing and dense wavelength division multiplexing.

3. The light emitting device with multiple wavelength channels of claim 1 or 2, wherein: and a light beam displacement prism is also arranged between the focusing coupling lens and the optical fiber, the light beam output by the focusing coupling lens is incident into the light beam displacement prism, and the light beam displacement prism is used for changing the transmission path of the light beam to the position of the optical fiber for installing the light emitting device, so that the light beam is vertically incident into the optical fiber.

4. The light emitting device with multiple wavelength channels of claim 3, wherein: the light beam displacement prism is a glass prism, antireflection films are plated on the incident surface and the emergent surface of the glass prism, and total internal reflection surfaces are formed on two opposite side end surfaces of the glass prism.

5. A light receiving device having a plurality of wavelength channels, characterized in that: the device is provided with a photoelectric detector assembly, a focusing coupling lens assembly, an integrated thin film filter module and a collimating lens; the photoelectric detector assembly is internally provided with N photoelectric detectors, the focusing coupling lens assembly is internally provided with N focusing coupling lenses, the thin film filter module is internally provided with a glass body, the glass body is provided with N band-pass thin film filters and a reflecting membrane, the N band-pass thin film filters are arranged adjacent to the focusing coupling lenses, and the reflecting membrane is arranged adjacent to the collimating lenses; the optical signals input through the optical fibers are incident into the thin film filter module through the collimating lens, are divided into N paths of optical signals with different wavelengths through the thin film filter module, are incident into the N focusing coupling lenses in a one-to-one correspondence mode, are respectively coupled into the N photoelectric detectors through the focusing coupling lenses, and are converted to generate electric signals.

6. A light receiving device having multiple wavelength channels according to claim 5, wherein: the N band-pass thin-film filters have the characteristics of transmitting incident light with specific wavelength and reflecting incident light with other wavelengths, each band-pass thin-film filter transmits light beams with different wavelengths, and the interval of the N wavelengths accords with the regulation of ITU on coarse wavelength division multiplexing and dense wavelength division multiplexing.

7. The light-receiving device having multiple wavelength channels according to claim 5 or 6, wherein: and a beam displacement prism is also arranged between the optical fiber and the collimating lens, and the optical signal input through the optical fiber changes the transmission path of the optical signal to the mounting position of the collimating lens through the beam displacement prism, so that the optical signal vertically enters the collimating lens.

8. A light receiving device having multiple wavelength channels according to claim 7, wherein: the light beam displacement prism is a glass prism, antireflection films are plated on the incident surface and the emergent surface of the glass prism, and total internal reflection surfaces are formed on two opposite side end surfaces of the glass prism.

9. An optical module, characterized in that: a light emitting device having multiple wavelength channels according to any one of claims 1 to 4 and a light receiving device having multiple wavelength channels according to any one of claims 5 to 8 are provided.

10. The light module of claim 9, wherein: said N is equal to 4.