CN210348114U - Free space polarized optical isolation component and free space type coherent receiver thereof - Google Patents
Free space polarized optical isolation component and free space type coherent receiver thereof Download PDFInfo
- Publication number
- CN210348114U CN210348114U CN201920657297.7U CN201920657297U CN210348114U CN 210348114 U CN210348114 U CN 210348114U CN 201920657297 U CN201920657297 U CN 201920657297U CN 210348114 U CN210348114 U CN 210348114U
- Authority
- CN
- China
- Prior art keywords
- free space
- beam splitter
- polarized light
- free
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 81
- 238000002955 isolation Methods 0.000 title claims abstract description 44
- 230000001427 coherent effect Effects 0.000 title claims abstract description 41
- 230000010287 polarization Effects 0.000 claims abstract description 37
- 239000010408 film Substances 0.000 claims description 6
- 239000010409 thin film Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000003667 anti-reflective effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- 238000004891 communication Methods 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Images
Abstract
The utility model relates to the technical field of optical communication, in particular to a free space polarized light isolation component and a free space type coherent receiver thereof, wherein the free space polarized light isolation component comprises a polarized light beam splitter, a Faraday rotator, a half wave plate and a magnetic ring which is arranged opposite to the polarized light beam splitter; the Faraday rotation piece and the half-wave plate are assembled in the magnetic ring at a certain angle with the horizontal plane. The utility model discloses will free space's polarization optical isolation subassembly is applied to in the coherent receiver of free space type, and polarizing optical isolation effect can keep apart the reflection light sum of bringing from 90 degrees optical hybrid chip end and crosstalk light, and fundamentally solves the problem of the coherent receiver light reflection of free space type and optical crosstalk, greatly reduces coherent light receiving module's light reflection and optical crosstalk, makes the influence of these two parameters not receiving optical chip coating film technology and inner structure technology, has improved the yield of module widely.
Description
Technical Field
The utility model relates to an optical communication technical field especially relates to a free space's polarized light isolation subassembly and use its free space type coherent receiver.
Background
With the greatly improved signal transmission rate requirement of a communication system and the more mature research on the application of digital signal processing and high-order optical modulation technology, coherent optical communication becomes a research hotspot of modern optical communication with high rate and high performance. The coherent optical receiver is an important optoelectronic component in a coherent optical communication system, and has the advantages of high sensitivity, long relay distance, good selectivity, large communication capacity, various modulation modes and the like. In recent years, coherent optical receivers have become the focus of research again due to advances in optical devices and digital signal processing techniques.
As shown in fig. 1, a coherent optical receiver generally includes two 90 ° optical Hybrid optical chips (90deg Hybrid mixers) 101 based on a planar optical waveguide process, four groups of eight photodetectors, one signal optical Polarization Beam Splitter (PBS) 102, one reference optical Beam Splitter (BS) 103, and 4 linear transimpedance amplifiers (TIA) 104 and Automatic Gain Controllers (AGC) 105. A general coherent optical receiver has two types of packages: free space type and chip integrated type. The difference between the two is that the free space type light transmitted by the optical fiber needs to pass through a series of free optical paths in the coherent light receiver and then be coupled into the optical chip; the chip integrated type light transmitted by the optical fiber is directly coupled into the optical chip. For a free space type coherent optical receiver, two performance parameters, namely optical reflection and optical crosstalk, are greatly influenced by a chip coating process and an internal structure process, so that product performance parameters are degraded and yield fluctuation is high.
In order to reduce the optical reflection of the free space type coherent receiver, a method of reducing the film-coated reflectivity of the optical chip is generally adopted in the prior art. In order to reduce the optical crosstalk, the optical chip needs to be designed by optimizing the internal structure of the optical chip and the chip process. Although the two methods can achieve the purpose to a certain extent, the yield fluctuates greatly along with the process level, and the problems of light reflection and light crosstalk of the free space type coherent light receiver cannot be solved fundamentally.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a free space's polarized light isolation subassembly and use its free space type coherent receiver, can fundamentally reduce coherent light receiver's light reflection and optical crosstalk, greatly improve the yield of module.
In order to achieve the above object, the present invention provides a free space polarized light isolation assembly, which comprises a polarized light beam splitter, a faraday rotator, a half wave plate, and a magnetic ring disposed opposite to the polarized light beam splitter; the Faraday rotation piece and the half-wave plate are assembled in the magnetic ring at a certain angle with the horizontal plane.
Preferably, the polarization beam splitter may be a thin film type polarization beam splitter.
Specifically, the polarization beam splitter may be formed by bonding three prisms and a zero-order half-wave plate, and the three prisms are respectively formed by two isosceles triangular prisms and a parallelogram prism. In addition, the bonding surface of the prism is also plated with an anti-reflection and reflection increasing film for transmitting wave bands.
The utility model discloses in, Faraday rotator and two half wave plates can personally submit 3 ~ 10 with the level and assemble in the magnetic ring. The Faraday rotator and the half wave plate are bonded together in parallel, and the Faraday rotator is arranged on one side, which is closer to the polarization beam splitter, relative to the half wave plate.
Further, the utility model also provides a free space type coherent receiver of the polarized light isolation subassembly of the aforesaid free space of application, it includes the coherent receiver body of free space type, this internal polarized light isolation subassembly that includes the free space of coherent receiver of free space type, this polarized light isolation subassembly includes a polarized light beam splitter, Faraday rotator, half wave plate to and a magnetic ring that sets up with the polarized light beam splitter relatively; the Faraday rotation piece and the half-wave plate are assembled in the magnetic ring at a certain angle with the horizontal plane.
Specifically, the free-space polarized optical isolation component is located between a first collimating lens and a reference beam splitter in the free-space coherent receiver body, or located between the first collimating lens and a second collimating lens.
The utility model discloses free space's polarized light isolation subassembly and the coherent receiver of free space type, it can keep apart the reflection light sum of bringing from 90 degrees optical hybrid chip end and crosstalk light, fundamentally solves the problem of the coherent light receiver light reflection of free space type and optical crosstalk, greatly reduces coherent light receiving module's light reflection and optical crosstalk, makes the influence of these two parameters not receiving optical chip coating film technology and inner structure technology, has improved the yield of module widely.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a block diagram of one embodiment of a coherent receiver in the prior art;
FIG. 2 is a schematic structural diagram of an embodiment of a free-space polarized light isolation assembly according to the present invention;
FIG. 3 is a schematic diagram of an embodiment of the present invention, wherein the polarization beam splitter 10 is shown in the figure;
fig. 4 is a block diagram of a free-space polarized optical isolation module according to the present invention, which is applied to a free-space coherent receiver;
fig. 5 and fig. 6 are schematic diagrams of the operating principle of the polarized light isolation assembly in free space according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
The utility model provides a free space polarized light isolation component 100, as shown in fig. 2, which comprises a polarized light beam splitter 10, a faraday rotator 20, a half wave plate 30 and a magnetic ring 40 arranged opposite to the polarized light beam splitter 10; the Faraday rotator 20 and the half-wave plate 30 are assembled in the magnetic ring 40 at a certain angle with the horizontal plane. The utility model discloses an although simple structure of polarized light isolation subassembly, can keep apart the reflection light sum of bringing from 90 degrees optical hybrid chip end and crosstalk light, fundamentally solves the problem of the coherent light receiver light reflection of free space type and optical crosstalk, greatly reduces coherent light receiving module's light reflection and optical crosstalk, makes the influence of these two parameters not photic chip coating film technology and inner structure technology, has improved the yield of module widely.
In the present invention, the polarization beam splitter 10 may be a thin film type polarization beam splitter which can separate incident X-polarized light (TE light) and Y-polarized light (TM light) in different directions, and in order to maintain the TE light as the outgoing light, another half wave plate 11 is further bonded to one end of the polarization beam splitter 10. As a specific embodiment of the present invention, the polarization beam splitter 10 may be formed by bonding three prisms 12, 13, 14 and a zero-order half-wave plate 11 with glue, and the three prisms 12, 13, 14 are respectively composed of two isosceles triangular prisms and a parallelogram prism (shown in fig. 3). In addition, the bonding surfaces of the prisms 12, 13 and 14 are also plated with antireflection and reflection increasing films for transmission wave bands. The outer surfaces and the adhesive surfaces of the polarization beam splitter 10 are shown as S1 to S9 in fig. 3. The S1 surface of the polarized optical isolation component is an incident surface for incident parallel light (including reference light LO and signal light SIG), the S7 surface divides the parallel light passing through the S1 surface into X-polarized light and Y-polarized light, wherein the X-polarized light is emitted through the S5 surface, the Y-polarized light is reflected through the S8 surface, passes through the zero-order half wave plate 11 through the S9 surface after reflection, is emitted in an X-polarized light mode through the S4 surface, and is parallel to the X-polarized light emitted through the S5 surface. As described above, the signal light SIG includes X-polarized light and Y-polarized light, and is incident through the S1 plane in the form of parallel light, and is divided into SIG-X polarized light and SIG-Y polarized light after passing through the S7 plane of the polarization beam splitter 10, the SIG-X polarized light exits through the S5 plane, the SIG-Y polarized light is reflected by the S8 plane, and after being reflected, passes through the S9 plane, and then passes through the zero-order half wave plate 11, and then becomes X-polarized light to exit through the S4 plane, and enters the faraday rotator 20 and the half wave plate 30 in parallel with the SIG-X polarized light exiting through the S5 plane, and after exiting, both enter the 90 ° optical mixer optical chip 101 in the form of X-polarized light; the reference light is X-polarized light, and is incident through the S7 plane of the polarization beam splitter 10 via the S1 plane and then exits from the S5 plane, and the polarization direction remains unchanged after passing through the faraday rotator 20 and the half-wave plate 30, and finally enters the 90 ° optical hybrid chip 101 in the form of X-polarized light.
Specifically, the faraday rotator 20 and the half-wave plate 30 can be assembled in the magnetic ring 40 at an angle of 3-10 degrees with respect to the horizontal plane. The faraday rotator 20 and the half-wave plate 30 are bonded together in parallel, and the faraday rotator 20 is disposed on the side closer to the polarization beam splitter 10 than the half-wave plate 30. As a preferred embodiment of the present invention, the Faraday rotator 20 and the two-half wave plate 30 are preferably assembled in the magnetic ring 40 at an angle of 6-8 degrees with respect to the horizontal plane.
Although the polarization beam splitter 10, the faraday rotator 20, and the half-wave plate 30 in the present invention are conventional devices in the art, in the prior art, a general single-stage isolator generally adopts a structure of faraday rotator + polarizer. Furthermore, the faraday rotator 20 and the half-wave plate 30 alone have no isolation effect, and even if the faraday rotator and the half-wave plate are present at the same time in the prior art, the two are not used as an isolator. Therefore, the utility model discloses ingenious PBS and Faraday rotator have been used to the characteristic of reflection linear polarization light, through the polarization state that changes the reverberation, make the reverberation can not return along former light path to play the effect that polarized light was kept apart.
Because the utility model discloses a polarized light isolation subassembly 100 can effectually play the effect that polarized light was kept apart, and it can be applied to all optical devices that contain PBS, the cost that can greatly reduced light isolator. Therefore, the present invention further provides a free space type coherent receiver using the free space polarized light isolation module, which applies the free space polarized light isolation module 100 to the free space type coherent receiver to polarize light isolation.
Specifically, the free space type coherent receiver comprises a free space type coherent receiver body 1, a free space polarized optical isolation assembly 100 is included in the free space type coherent receiver body 1, and the polarized optical isolation assembly 100 comprises a polarized light beam splitter 10, a faraday rotator 20, a half-wave plate 30 and a magnetic ring 40 arranged opposite to the polarized light beam splitter 10; the Faraday rotator 20 and the half-wave plate 30 are assembled in the magnetic ring 40 at a certain angle with the horizontal plane. As shown in fig. 4, free-space polarized optical isolation component 100 may be located between a first collimating lens (collimating lens)106 and BS 103 in free-space type coherent receiver body 1, or may be located between first collimating lens 106 and a second collimating lens 107, where the second collimating lens 107 may be a plurality of lens arrays arranged in parallel.
For incident light, as shown in fig. 5, X-polarized light and Y-polarized light contained in signal light (SIG) are divided into SIG-X polarized light and SIG-Y polarized light after passing through PBS, and the SIG-Y polarized light passes through zero-order half wave plate 11, becomes X-polarized light, then enters faraday rotator 20 and half wave plate 30 in parallel with X-polarized light emitted from SIG-X, and enters 90 ° optical mixer optical chip 101 in the form of X-polarized light after being emitted; for X-polarized light emitted from the reference light, the polarization direction remains unchanged after passing through polarized optical isolation assembly 100, and eventually enters 90 ° optical mixer chip 101 in the form of X-polarized light.
For the reflected light, as shown in fig. 6, the X-polarized light reflected from the 90 ° optical hybrid chip 101 along the SIG-X and LO incident optical paths passes through the polarized optical isolation assembly 100, and the reflected X-polarized light passes through the half wave plate 20 and the faraday rotator 30 due to the non-reciprocity of the faraday rotator 20, is changed from the X-polarized light to the Y-polarized light, and then passes through the polarization beam splitter 10, the reflected light does not return from the original path, but is reflected from the side surface S6 of the polarization beam splitter 10, thereby playing a role in isolating the SIG-X and LO reflected lights. Similarly, the X-polarized light reflected from the 90 ° optical hybrid chip 101 along the SIG-Y incident light path passes through the polarized optical isolation assembly 100, and the reflected X-polarized light passes through the half-wave plate 30 and the faraday rotator 20, and then is changed from X-polarized light to Y-polarized light, and then passes through the polarization beam splitter 10, and the reflected light exits from the side surface S2 of the polarization beam splitter 10, thereby achieving the effect of isolating the SIG-Y reflected light.
As for the crosstalk light, as shown in fig. 6, reflected light to the LO channel along the SIG-X and SIG-Y crosstalk, and reflected light to the SIG-X and SIG-Y along the LO crosstalk are included. For the reflected light from the SIG-X and SIG-Y crosstalk to the LO channel, the X-polarized light reflected from the 90 ° optical hybrid chip 101 along the LO incident light path passes through the polarization optical isolation assembly 100, and due to the non-reciprocity of the faraday rotator 20, the reflected X-polarized light passes through the half-wave plate 20 and the faraday rotator 30, and then is changed into Y-polarized light by the X-polarized light, and then passes through the polarization beam splitter 10, the reflected light does not return from the original path, but is reflected from the side surface S6 of the polarization beam splitter 10, so as to achieve the effect of isolating the SIG-X and SIG-Y crosstalk from the LO channel reflected light. Similarly, for the reflected light to the SIG-X channel along the LO crosstalk, the X-polarized light reflected from the 90 ° optical hybrid optical chip 101 along the SIG-X incident optical path passes through the polarized optical isolation assembly 100, and due to the non-reciprocity of the faraday rotator 20, the reflected X-polarized light passes through the half wave plate 20 and the faraday rotator 30, and is changed into Y-polarized light from the X-polarized light, and then passes through the polarization beam splitter 10, the reflected light is not returned from the original path, but is reflected from the side surface S6 of the polarization beam splitter 10, so as to achieve the effect of isolating the LO crosstalk to the SIG-X channel reflected light. As described above, for the reflected light from the LO crosstalk to the SIG-Y channel, the X-polarized light reflected from the 90 ° optical hybrid optical chip 101 along the SIG-Y incident optical path passes through the polarized optical isolation assembly 100, and the reflected X-polarized light passes through the half-wave plate 30 and the faraday rotator 20, and then is changed from the X-polarized light to the Y-polarized light, and then passes through the polarization beam splitter 10, the reflected light exits from the side surface S2 of the polarization beam splitter 10, thereby achieving the effect of isolating the LO crosstalk from the SIG-Y channel reflected light.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A free space polarized light isolation component is characterized by comprising a polarized light beam splitter, a Faraday rotator, a half wave plate and a magnetic ring which is arranged opposite to the polarized light beam splitter; the Faraday rotation piece and the half-wave plate are assembled in the magnetic ring at a certain angle with the horizontal plane.
2. The free-space polarized optical isolation assembly of claim 1 wherein said polarizing beam splitter is a thin film type polarizing beam splitter.
3. The free-space polarized optical isolation assembly of claim 2 wherein said polarizing beam splitter is formed by bonding three prisms consisting of two isosceles triangular prisms and a parallelogram prism, respectively, to a zero-order half wave plate.
4. The free-space polarized optical isolation assembly of claim 3 wherein the prism has an adhesive surface coated with a transmission band antireflective and reflection enhancement film.
5. The free-space polarized optical isolation assembly as claimed in claim 1, wherein the faraday rotator and the half-wave plate are assembled in the magnetic ring at an angle of 3-10 ° with respect to the horizontal plane.
6. The free-space polarized optical isolation assembly of claim 5 wherein the Faraday rotator plate is bonded to the half-wave plate in parallel, the Faraday rotator plate being positioned closer to the polarization beam splitter than the half-wave plate.
7. A free space type coherent receiver applying the free space polarization optical isolation component as claimed in any one of claims 1 to 6, comprising a free space type coherent receiver body, wherein the free space type coherent receiver body comprises the free space polarization optical isolation component, the polarization optical isolation component comprises a polarization beam splitter, a Faraday rotator, a half wave plate, and a magnetic ring arranged opposite to the polarization beam splitter; the Faraday rotation piece and the half-wave plate are assembled in the magnetic ring at a certain angle with the horizontal plane.
8. The free-space coherent receiver of claim 7, wherein the free-space polarized optical isolation component is located between a first collimating lens and a reference beam splitter or between the first collimating lens and a second collimating lens within the free-space coherent receiver body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920657297.7U CN210348114U (en) | 2019-05-08 | 2019-05-08 | Free space polarized optical isolation component and free space type coherent receiver thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920657297.7U CN210348114U (en) | 2019-05-08 | 2019-05-08 | Free space polarized optical isolation component and free space type coherent receiver thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210348114U true CN210348114U (en) | 2020-04-17 |
Family
ID=70181451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920657297.7U Active CN210348114U (en) | 2019-05-08 | 2019-05-08 | Free space polarized optical isolation component and free space type coherent receiver thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210348114U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161725A (en) * | 2019-05-08 | 2019-08-23 | 深圳新飞通光电子技术有限公司 | A kind of polarised light barrier assembly of free space and its application |
-
2019
- 2019-05-08 CN CN201920657297.7U patent/CN210348114U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161725A (en) * | 2019-05-08 | 2019-08-23 | 深圳新飞通光电子技术有限公司 | A kind of polarised light barrier assembly of free space and its application |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11754787B2 (en) | Multi-channel light-receiving module | |
| CN204925459U (en) | Two -way light transceiver module of multi -wavelength single fiber | |
| CN105319648A (en) | Combined splitter, optical isolator and spot-size converter | |
| CN112799185A (en) | Four-port circulator for single-fiber bidirectional communication and optical module | |
| CN213240587U (en) | Compact optical wavelength division multiplexing demultiplexing device | |
| CN210348114U (en) | Free space polarized optical isolation component and free space type coherent receiver thereof | |
| CN210982809U (en) | Compact optical path hybrid device | |
| CN215297755U (en) | Four-port circulator for single-fiber bidirectional communication and optical module | |
| US20220121045A1 (en) | Small integrated free space circulator | |
| CN212379609U (en) | Low-cost small-size optical circulator | |
| CN110346872B (en) | Optical fiber array structure with polarization beam splitter prism isolator | |
| CN211206998U (en) | Reflective polarization-independent online isolator and optical fiber laser | |
| CN111856655B (en) | High-isolation polarization-independent micro free space circulator | |
| CN112698450B (en) | Optical module | |
| CN208984906U (en) | A kind of integrated free space optical circulator | |
| CN213276022U (en) | Polarization-independent optical circulator | |
| CN110531465B (en) | Optical circulator and single-fiber bidirectional optical module | |
| CN209746185U (en) | Three-port optical circulator | |
| CN110161725A (en) | A kind of polarised light barrier assembly of free space and its application | |
| CN221613063U (en) | Three-port optical circulator | |
| CN222014514U (en) | Four-port optical circulator | |
| CN213338123U (en) | Single-fiber bidirectional optical module | |
| CN222014513U (en) | Three-port free space optical circulator | |
| CN221326808U (en) | Low-crosstalk parallel multi-channel optical module passive optical component | |
| CN221056706U (en) | Optical circulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240318 Address after: Room 601 and 701, North Block, Yuanxing Technology Building, No.1 Songpingshan Road, High tech Industrial Park (North District), Nanshan District, Shenzhen, Guangdong Province, 518057 Patentee after: Longmet Communication Technology (Shenzhen) Co.,Ltd. Country or region after: China Address before: 518057 xinfeitong optoelectronic building, No.8, Keji South 12 road, Nanshan District, Shenzhen City, Guangdong Province Patentee before: NEOPHOTONICS Corp. Country or region before: China |
|
| TR01 | Transfer of patent right |