CN109884753B - Light receiving assembly and assembling method - Google Patents
Light receiving assembly and assembling method Download PDFInfo
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- CN109884753B CN109884753B CN201910300840.2A CN201910300840A CN109884753B CN 109884753 B CN109884753 B CN 109884753B CN 201910300840 A CN201910300840 A CN 201910300840A CN 109884753 B CN109884753 B CN 109884753B
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- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000002955 isolation Methods 0.000 claims abstract description 12
- 230000008878 coupling Effects 0.000 claims abstract description 11
- 238000005859 coupling reaction Methods 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000010409 thin film Substances 0.000 claims description 20
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- 239000011159 matrix material Substances 0.000 claims description 15
- 238000004026 adhesive bonding Methods 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
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- 239000003292 glue Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
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- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 230000005856 abnormality Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000835 fiber Substances 0.000 description 9
- 239000011521 glass Substances 0.000 description 5
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- 239000002184 metal Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention provides an optical receiving assembly, which comprises a socket, a wavelength division multiplexing module and a turning prism, wherein the wavelength division multiplexing module is used for receiving optical signals transmitted by the socket and performing wavelength division multiplexing processing on the optical signals into optical signals with different wave bands to be output, and the turning prism is used for turning the optical signals with different wave bands passing through the wavelength division multiplexing module. Compared with the prior art, the invention provides the light receiving assembly and the assembling method, wherein the light signals are processed into light signals with different wave bands by adopting the dielectric film filter and output, and the light signals with different wave bands are turned by adopting the turning prism, so that the insertion loss can be less than 0.8dB, the isolation can be 30dB, and the light receiving assembly can be applied to high-speed and long-distance transmission; in the assembly method, the few-mode optical fiber array is adopted to replace the high-speed detector array for optical coupling, the automatic coupling process is simple, the production efficiency is high, the optical component or the electronic component can be rapidly judged to be abnormal when the abnormality occurs in the coupling process, the convenience is brought to maintenance, and the maintenance cost is saved.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to an optical receiving assembly and an assembling method.
Background
The optical transmission module is divided into a single-mode optical transmission module and a multi-mode optical transmission module, and comprises an optical sub-module (Optical Subassembly; OSA) and an electronic sub-module (Electrical Subassembly; ESA) on the whole product architecture. The optical sub-modules may be further subdivided into optical transmit sub-modules (Transmitter Optical Subassembly; TOSA) and optical receive sub-modules (Receiver Optical Subassembly; ROSA). The optical receiving sub-module (ROSA) includes an optical receiving element and a PD array element. However, the existing optical receiving assembly mostly adopts an Arrayed Waveguide Grating (AWG), the insertion loss is 2dB to 3dB, the isolation is 18 dB, the requirements on medium-low speed and short distance transmission can be met, but the insertion loss is larger and the isolation is lower for high-speed and long distance transmission. In addition, the existing light receiving sub-module needs high-speed detector array on-line coupling to be completed during assembly, and automatic coupling is complex.
Disclosure of Invention
In view of the above, the present invention provides an optical receiving assembly capable of reducing insertion loss and improving isolation to satisfy the requirements of high-speed and long-distance transmission.
The invention adopts the technical scheme that:
the light receiving assembly is characterized by comprising a socket, a wavelength division multiplexing module and a turning prism, wherein the wavelength division multiplexing module is used for receiving light signals transmitted by the socket and performing wavelength division multiplexing processing on the light signals into light signals with different wave bands to be output, and the turning prism is used for turning the light signals with different wave bands passing through the wavelength division multiplexing module; the wavelength division multiplexing module comprises a single optical fiber collimator connected with the socket through optical fibers and used for allowing optical signals to enter, a dielectric thin film filter used for performing wavelength division multiplexing processing on the optical signals passing through the single optical fiber collimator to be output into optical signals of different wave bands, and an optical fiber emergent module used for receiving the optical signals of different wave bands, and the steering prism is arranged on the light emitting side of the optical fiber emergent module.
Preferably, the dielectric film filter comprises a filter base body, one side of the filter base body is provided with a reflecting piece for reflecting an incident light signal entering the filter base body, and the other side of the filter base body is provided with a plurality of dielectric film filters for processing the incident light signal into light signals with different wave bands.
More preferably, the optical fiber emitting module comprises an emitting substrate, and a plurality of lenses which are respectively corresponding to the dielectric thin film filters and used for penetrating optical signals penetrating through the dielectric thin film filters are arranged on the emitting substrate.
More preferably, the steering prism is a right-angle prism, one vertical surface of the right-angle prism is attached to the light-emitting surface of the emergent substrate, and the included angle between the inclined surface of the right-angle prism and the other vertical surface is 40-45 degrees.
Preferably, the wavelength division multiplexing module and the steering prism are both mounted on a base plate.
More preferably, a beam focusing surface for converging the light beam passing through the turning prism is formed on the bottom surface of the base plate.
The invention also provides an assembling method of the light receiving assembly, which comprises the following steps:
1) Mounting a dielectric film filter, an optical fiber emergent module and a steering prism on a bottom plate to obtain a semi-finished product assembly, and preparing a socket and a collimator;
2) Inserting a plurality of few-mode optical fibers into an optical fiber base to obtain a few-mode optical fiber array;
3) Placing the semi-finished product assembly, the socket and the collimator on a fixture, wherein the socket is connected with the collimator through optical fibers;
4) The few-mode optical fiber array is installed on a six-dimensional adjusting frame, and the positions of the few-mode optical fiber array are prealigned on an optical microscope, so that the incident end face of each few-mode optical fiber of the few-mode optical fiber array corresponds to the light emitting face of the steering prism;
5) The tail part of each few-mode optical fiber in the few-mode optical fiber array is respectively connected with an optical power meter, and the optical power meter is zeroed;
6) Connecting the socket with a light source, adjusting the position of a collimator and the position of a few-mode optical fiber array, and pre-finding light by observing parameters of an optical power meter;
7) Adjusting the positions of the collimator and the few-mode optical fiber array to minimize the insertion loss coupling of each channel in the dielectric thin film filter, and switching the light source wavelength to test the insertion loss and isolation of each channel bandwidth edge in the dielectric thin film filter to meet the requirements;
8) And fixing the collimator after coupling on a bottom plate, and retesting the insertion loss and isolation of each channel in the dielectric film filter through the few-mode optical fiber array and the optical power meter to meet the requirements of the finished product of the light receiving component.
Preferably, in step 1), the medium film filter, the emergent matrix and the steering prism are mounted on the bottom plate in a gluing mode, the filter matrix, the emergent matrix and the steering prism are glued on the bottom plate, one vertical side surface of the steering prism is attached to the emergent surface of the emergent matrix, and the substrate is baked by an ultraviolet lamp and then baked in a high-temperature oven, wherein the baking time of the ultraviolet lamp is 0.5H to 2H, and the baking temperature of the high-temperature oven is 80 ℃ to 115 ℃.
Preferably, the optical fiber base in step 2) is provided with an insertion groove for inserting each few-mode optical fiber, the space between the few-mode optical fibers in the few-mode optical fiber array is consistent with the space between the lenses, and the incident end face of each few-mode optical fiber has an inclination angle in the range of 0-10 degrees.
Preferably, in the step 8), the collimator is fixed on the bottom plate in a gluing mode, and the collimator is fixed on the bottom plate through ultraviolet glue; when the finished product of the light receiving component is obtained, the finished product is taken down from the clamp, the dust cap of the socket is covered, and then the light receiving component is put into a high-temperature box for baking, wherein the temperature of the high-temperature box is 80-110 ℃, and the baking time is 0.5-1.5H.
Compared with the prior art, the invention has the beneficial effects that: the invention provides an optical receiving assembly and an assembling method, which adopts a dielectric film filter to process optical signals into optical signals with different wave bands for output, adopts a steering prism to steer the optical signals with different wave bands, so that the insertion loss can be less than 0.8dB, the isolation can be up to 30dB, and the optical receiving assembly can be applied to high-speed and long-distance transmission; in the assembly method, the few-mode optical fiber array is adopted to replace the high-speed detector array for optical coupling, the automatic coupling process is simple, the production efficiency is high, the optical component or the electronic component can be rapidly judged to be abnormal when the abnormality occurs in the coupling process, the convenience is brought to maintenance, and the maintenance cost is saved.
Drawings
Fig. 1 is a front view of a light receiving assembly according to the present invention;
FIG. 2 is a top view of a light receiving assembly according to the present invention;
FIG. 3 is a schematic diagram of an assembling method of a light receiving assembly according to the present invention;
FIG. 4 is a front view of a few-mode fiber array in an assembly method of a light receiving assembly according to the present invention;
fig. 5 is a left side view of a few-mode fiber array in an assembly method of a light receiving assembly according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 to 2 are schematic views showing a preferred embodiment of a light receiving module according to the present invention. As shown in fig. 1 to 2, the optical receiving assembly includes a socket 10, a wavelength division multiplexing module 20 for receiving an optical signal transmitted through the socket and performing wavelength division multiplexing processing on the optical signal into optical signals of different wavelength bands for output, and a turning prism 30 for turning the optical signals of different wavelength bands passing through the wavelength division multiplexing module; the wavelength division multiplexing module 20 comprises a single optical fiber collimator 21 connected with the socket 10 through optical fibers for light signal incidence, a dielectric film filter 22 for performing wavelength division multiplexing processing on the optical signals passing through the single optical fiber collimator into light signals with different wave bands for output, and an optical fiber emergent module 23 for receiving the light signals with different wave bands, the turning prism 30 is arranged on the light emergent side of the optical fiber emergent module 23, the optical signals received from the socket 10 are transmitted to the single optical fiber collimator 21 through the optical fibers, the dielectric film filter 22 performs wavelength division multiplexing processing on the optical signals incident from the single optical fiber collimator 21 into optical signals with different wave bands, the optical signals with different wave bands are received by the optical fiber emergent module 23 and then are turned by the turning prism 30, so that the insertion loss can be less than 0.8dB, the isolation can reach 30dB, and the optical fiber coupler can be applied to high-speed and long-distance transmission.
The wavelength division multiplexing module 20 and the turning prism 30 are both mounted on a base plate 40. The wavelength division multiplexing module 20 and the turning prism 30 are mounted on the bottom plate 40 by gluing.
The dielectric thin film filter 22 comprises a filter base 221, wherein the bottom surface of the filter base 221 is mounted on the bottom plate 40 in a gluing manner, one side of the filter base is provided with a reflecting member 222 for reflecting an incident light signal entering the filter base, the other side of the filter base is provided with a plurality of dielectric thin film filters 223 for processing the incident light signal into light signals with different wave bands, the incident light signal emitted from the single fiber collimator 21 enters the filter base 221, is reflected by the reflecting member 222, and is processed into the light signals with different wave bands by the dielectric thin film filters 223 to be emitted. The reflective element 222 may be a highly reflective film through which the incident optical signal is reflected multiple times within the filter matrix 221. The filter substrate 221 is solid glass, hollow glass or hollow metal.
The optical fiber emitting module 23 includes an emitting substrate 231, the emitting substrate 231 is mounted on the bottom plate 40 in a gluing manner, a plurality of lenses 232 corresponding to the dielectric thin film filters respectively for the light signals passing through the dielectric thin film filters are arranged on the emitting substrate 231, the center of each lens 232 is at the same height as the center of each dielectric thin film filter, and the optical fiber emitting module 23 gathers the light beams filtered by the dielectric thin film filters 22 according to the wave bands. The single-fiber collimator 21 comprises a capillary glass tube, a C-LENS LENS and a glass tube, wherein a chamfered edge plane is arranged on the outer side of the glass tube and is glued with the bottom plate 40, and the ratio of the effective focal length of the C-LENS LENS to the effective focal length of the optical fiber emergent module 23 is 1:1.
The turning prism 30 is a right-angle prism, one vertical plane of the right-angle prism is attached to the light-emitting surface of the light-emitting substrate 231, the included angle range between the inclined plane of the right-angle prism and the other vertical plane is 40 ° -45 °, the light beam passing through the optical fiber light-emitting module 23 passes through the vertical plane attached to the light-emitting surface of the light-emitting substrate 231 on the right-angle prism, and then is reflected by the inclined plane of the right-angle prism and finally exits from the other right-angle plane of the right-angle prism. The bottom surface of the base plate 40 is formed with a beam focusing surface 41 for converging the light beam passing through the turning prism, so that the light beam finally passing through the other right angle surface of the right angle prism is converged on the beam focusing surface. The other vertical face of the right angle prism is mounted to the base plate 40 by gluing.
The invention also provides an assembling method of the light receiving assembly, which comprises the following steps:
1) Mounting the dielectric thin film filter 22, the optical fiber exit module 23 and the turning prism 30 on the bottom plate 40 to obtain a semi-finished product assembly, and preparing the socket 10 and the collimator 21;
2) Inserting a plurality of few-mode optical fibers 51 into an optical fiber base 52 to obtain a few-mode optical fiber array 50, as shown in fig. 4 and 5;
3) Placing the semi-finished assembly, the socket and the collimator on a fixture, wherein the socket 10 and the collimator 21 are connected through optical fibers;
4) The few-mode optical fiber array is installed on a six-dimensional adjusting frame, and the positions of the few-mode optical fiber array are prealigned on an optical microscope, so that the incident end face of each few-mode optical fiber of the few-mode optical fiber array corresponds to the light emitting face of the steering prism;
5) As shown in fig. 3, the tail parts of the few-mode optical fibers in the few-mode optical fiber array are respectively connected with the optical power meters 60, and the optical power meters 60 are zeroed;
6) Connecting the socket with a light source, adjusting the position of a collimator and the position of a few-mode optical fiber array, and pre-finding light by observing parameters of an optical power meter;
7) Adjusting the positions of the collimator and the few-mode optical fiber array to minimize the insertion loss coupling of each channel in the dielectric thin film filter, and switching the light source wavelength to test the insertion loss and isolation of each channel bandwidth edge in the dielectric thin film filter to meet the requirements;
8) And fixing the collimator after coupling on a bottom plate, and retesting the insertion loss and isolation of each channel in the dielectric film filter through the few-mode optical fiber array and the optical power meter to meet the requirements of the finished product of the light receiving component.
Step 1) the medium film filter 22, the optical fiber exit module 23 and the turning prism 30 are mounted on the bottom plate in a gluing mode, the filter substrate 221, the exit substrate 231 and the turning prism are glued on the bottom plate 40, one vertical side surface of the turning prism is attached to the light exit surface of the exit substrate, the light is baked by an ultraviolet lamp, and then the light is baked in a high-temperature oven, wherein the baking time of the ultraviolet lamp is 0.5H to 2H, and the baking temperature of the high-temperature oven is 80 ℃ to 115 ℃.
Step 2) an insertion groove 521 into which each few-mode optical fiber 52 is inserted is provided in the optical fiber base 52, the pitch D of each few-mode optical fiber 51 in the few-mode optical fiber array 50 is identical to the pitch D between each lens 232, and the incident end face of each few-mode optical fiber 51 has an inclination angle in the range of 0 to 10 °. The core diameter of the few-mode fibers 51 in the few-mode fiber array 50 is 16 micrometers to 20.5 micrometers, and the numerical aperture NA is 0.1 to 0.12. The fiber optic base 52 is formed from a base body and a cover plate.
And 4) adjusting the position of the few-mode optical fiber array by using a six-dimensional adjusting frame, so that the whole incident end face of the few-mode optical fiber array is attached to the beam focusing surface of the whole light receiving assembly.
In the step 8), the collimator is fixed on the bottom plate in a gluing mode, and the collimator is fixed on the bottom plate through ultraviolet glue; when the finished product of the light receiving component is obtained, the finished product is taken down from the clamp, the dust cap of the socket is covered, and then the light receiving component is put into a high-temperature box for baking, wherein the temperature of the high-temperature box is 80-110 ℃, and the baking time is 0.5-1.5H.
As a preferred embodiment, the other side of the filter substrate is provided with four dielectric thin film filters 223, so that four channels are formed in the whole filter substrate; correspondingly, the emergent substrate 231 is provided with four lenses 232; four few-mode fibers 51 are included within the array of few-mode fibers when assembled.
The whole assembly method of the light receiving component adopts the few-mode optical fiber array to replace the high-speed detector array for optical coupling, the automatic coupling process is simple, the production efficiency is high, the optical component or the electronic component can be rapidly judged to be abnormal when the abnormality occurs in the coupling process, the convenience is brought to maintenance, and the maintenance cost is saved.
In summary, the technical solution of the present invention can fully and effectively achieve the above-mentioned objects, and the structural and functional principles of the present invention have been fully verified in the embodiments, so as to achieve the intended effects and purposes, and various changes or modifications may be made to the embodiments of the present invention without departing from the principles and spirit of the present invention. Accordingly, this invention includes all modifications encompassed within the scope of the invention as described in the claims and any equivalent thereof as would be within the scope of the invention as expressed in the claims.
Claims (7)
1. The light receiving assembly is characterized by comprising a socket, a wavelength division multiplexing module and a turning prism, wherein the wavelength division multiplexing module is used for receiving light signals transmitted by the socket and performing wavelength division multiplexing processing on the light signals into light signals with different wave bands to be output, and the turning prism is used for turning the light signals with different wave bands passing through the wavelength division multiplexing module; the wavelength division multiplexing module comprises a single optical fiber collimator connected with the socket through optical fibers and used for allowing optical signals to enter, a dielectric film filter used for performing wavelength division multiplexing processing on the optical signals passing through the single optical fiber collimator to output optical signals with different wave bands, and an optical fiber emergent module used for receiving the optical signals with different wave bands, wherein the steering prism is arranged on the light emergent side of the optical fiber emergent module;
the dielectric film filter comprises a filter matrix, wherein one side of the filter matrix is provided with a reflecting piece for reflecting an incident light signal entering the filter matrix, and the other side of the filter matrix is provided with a plurality of dielectric film filters for processing the incident light signal into light signals with different wave bands;
the optical fiber emergent module comprises an emergent matrix, wherein a plurality of lenses which are respectively corresponding to the dielectric thin film filters and used for penetrating optical signals passing through the dielectric thin film filters are arranged on the emergent matrix;
the wavelength division multiplexing module and the steering prism are both arranged on the bottom plate.
2. The light receiving assembly of claim 1, wherein: the steering prism is a right-angle prism, one vertical surface of the right-angle prism is attached to the light-emitting surface of the emergent substrate, and the included angle range between the inclined surface of the right-angle prism and the other vertical surface is 40-45 degrees.
3. The light receiving assembly of claim 1, wherein: a beam focusing surface for converging the light beam passing through the steering prism is formed on the bottom surface of the bottom plate.
4. A method of assembling a light receiving element according to any one of claims 1 to 3, comprising the steps of:
1) Mounting a dielectric film filter, an optical fiber emergent module and a steering prism on a bottom plate to obtain a semi-finished product assembly, and preparing a socket and a collimator;
2) Inserting a plurality of few-mode optical fibers into an optical fiber base to obtain a few-mode optical fiber array;
3) Placing the semi-finished product assembly, the socket and the collimator on a fixture, wherein the socket is connected with the collimator through optical fibers;
4) The few-mode optical fiber array is installed on a six-dimensional adjusting frame, and the positions of the few-mode optical fiber array are prealigned on an optical microscope, so that the incident end face of each few-mode optical fiber of the few-mode optical fiber array corresponds to the light emitting face of the steering prism;
5) The tail part of each few-mode optical fiber in the few-mode optical fiber array is respectively connected with an optical power meter, and the optical power meter is zeroed;
6) Connecting the socket with a light source, adjusting the position of a collimator and the position of a few-mode optical fiber array, and pre-finding light by observing parameters of an optical power meter;
7) Adjusting the positions of the collimator and the few-mode optical fiber array to minimize the insertion loss coupling of each channel in the dielectric thin film filter, and switching the light source wavelength to test the insertion loss and isolation of each channel bandwidth edge in the dielectric thin film filter to meet the requirements;
8) And fixing the collimator after coupling on a bottom plate, and retesting the insertion loss and isolation of each channel in the dielectric film filter through the few-mode optical fiber array and the optical power meter to meet the requirements of the finished product of the light receiving component.
5. The method of assembling a light receiving assembly according to claim 4, wherein: the method comprises the steps of 1) mounting a dielectric film filter, an emergent matrix and a turning prism on a bottom plate in a gluing mode, wherein the filter matrix, the emergent matrix and the turning prism are glued on the bottom plate, one vertical side surface of the turning prism is attached to the emergent surface of the emergent matrix, baking by an ultraviolet lamp, then baking in a high-temperature oven for 0.5-2H, and baking at 80-115 ℃.
6. The method of assembling a light receiving assembly according to claim 4, wherein: and 2) arranging an insertion groove for inserting each few-mode optical fiber in the optical fiber base, wherein the distance between the few-mode optical fibers in the few-mode optical fiber array is consistent with the distance between the lenses, and the incident end face of each few-mode optical fiber has an inclination angle in the range of 0-10 degrees.
7. The method of assembling a light receiving assembly according to claim 4, wherein: in the step 8), the collimator is fixed on the bottom plate in a gluing mode, and the collimator is fixed on the bottom plate through ultraviolet glue; when the finished product of the light receiving component is obtained, the finished product is taken down from the clamp, the dust cap of the socket is covered, and then the light receiving component is put into a high-temperature box for baking, wherein the temperature of the high-temperature box is 80-110 ℃, and the baking time is 0.5-1.5H.
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| CN110488433A (en) * | 2019-08-16 | 2019-11-22 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN114236716B (en) * | 2022-02-28 | 2022-05-17 | 耀芯电子(浙江)有限公司 | Single-fiber bidirectional multimode wavelength division multiplexing photoelectric conversion device and manufacturing method thereof |
| CN114858416B (en) * | 2022-04-29 | 2023-03-24 | 大连理工大学 | Device and method for comprehensively testing characteristic parameters of spatial dielectric thin film filter element |
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|---|---|---|---|---|
| CN1259808A (en) * | 1999-12-29 | 2000-07-12 | 华中理工大学 | One-sided zero degree angle down and upper load optical ware division and composite use parts |
| KR20030075431A (en) * | 2002-03-19 | 2003-09-26 | 삼성전자주식회사 | Wide band erbium doped fiber amplifier and wavelength division multiplexing transmission system therewith |
| CN209590346U (en) * | 2019-04-15 | 2019-11-05 | 北极光电(深圳)有限公司 | A kind of light-receiving component |
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| KR100541090B1 (en) * | 2003-10-17 | 2006-01-10 | 삼성전기주식회사 | A wavelength division multiplexer having a optical attenuator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1259808A (en) * | 1999-12-29 | 2000-07-12 | 华中理工大学 | One-sided zero degree angle down and upper load optical ware division and composite use parts |
| KR20030075431A (en) * | 2002-03-19 | 2003-09-26 | 삼성전자주식회사 | Wide band erbium doped fiber amplifier and wavelength division multiplexing transmission system therewith |
| CN209590346U (en) * | 2019-04-15 | 2019-11-05 | 北极光电(深圳)有限公司 | A kind of light-receiving component |
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