CN203799051U - Crystal-type 2*2 polarization-maintaining coupler with isolation function - Google Patents
Crystal-type 2*2 polarization-maintaining coupler with isolation function Download PDFInfo
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- CN203799051U CN203799051U CN201420212245.6U CN201420212245U CN203799051U CN 203799051 U CN203799051 U CN 203799051U CN 201420212245 U CN201420212245 U CN 201420212245U CN 203799051 U CN203799051 U CN 203799051U
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- polarization
- angle
- crystal
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- optical fiber
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- 238000002955 isolation Methods 0.000 title claims abstract description 33
- 230000010287 polarization Effects 0.000 claims abstract description 45
- 239000013307 optical fiber Substances 0.000 claims abstract description 39
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 239000013078 crystal Substances 0.000 claims abstract description 11
- 230000004888 barrier function Effects 0.000 claims description 28
- 239000000835 fiber Substances 0.000 claims description 26
- 230000009977 dual effect Effects 0.000 claims description 22
- 239000011521 glass Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- LSGOVYNHVSXFFJ-UHFFFAOYSA-N vanadate(3-) Chemical compound [O-][V]([O-])([O-])=O LSGOVYNHVSXFFJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052727 yttrium Inorganic materials 0.000 claims description 2
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 9
- 238000012546 transfer Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008033 biological extinction Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000002266 amputation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The utility model provides a crystal-type 2*2 polarization-maintaining coupler with an isolation function, which comprises a first polarization-maintaining dual-optical fiber collimator, a first light polarization beam splitting isolation assembly, a second light polarization beam splitting isolation assembly and a second polarization-maintaining dual-optical fiber collimator sequentially arranged along the optical path, wherein the first light polarization beam splitting isolation assembly and the second light polarization beam splitting isolation assembly are respectively composed of a polarization beam splitter composed of a first wedge angle sheet and a second wedge angle sheet and a piece of magneto-optical rotation crystal arranged in the middle of the first wedge angle sheet and the second wedge angle sheet; the optic axis included angle between the first wedge angle sheet and the second wedge angle sheet is 45 DEG; and the optic axis of the second wedge angle sheet of the light polarization beam splitting isolation assembly and the optic axis of the first wedge angle sheet of the second polarization beam splitting isolation assembly form an adjustable angle alpha, and the range of the angle alpha is larger than 0 and smaller than 90 DEG. The polarization-maintaining coupler provided by the utility model enables reverse transmission to be provided with single-stage or dual-stage isolation performance, and the isolation can be larger than 45dB.
Description
Technical field
The utility model relates to optical field, specifically, relates to a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features.
Background technology
Along with the development of optical communication network, transfer rate is more and more higher, and existing optical transport network is often used polarization maintaining optical fibre to keep the original polarization state transmission of light wave, requires the light splitting luminous power of outgoing to meet certain requirements, so polarization-maintaining coupler arises at the historic moment simultaneously.
The manufacture method > > of Chinese invention patent < < polarization-maintaining fiber coupler, publication number is CN101162281, a kind of manufacture method of polarization-maintaining fiber coupler is disclosed, it adopts fused biconical taper scheme, and concrete grammar is: the part coat of removing fibre cladding outside; Every optical fiber is removed to the part of coat and drawn thinning processing; Multifiber is carried out to part after drawing-down to be close together and to carry out fused biconical taper processing; Wherein, in drawing-down processing procedure, along described optical fiber axially clip part covering, and amputation part is being less than the radius of optical fiber along optical fiber thickness radially.
Yet above-mentioned fused tapered scheme need to solve the difficult alignment issues of Stress Profile for Polarization-Maintaining axle; Polarization maintaining optical fibre is by drawing-down, and stress area changes, and causes polarization extinction ratio not high, and temperature performance is unstable.In addition, manufacture this photo-coupler and need to use oxyhydrogen flame or electric arc processes, the large yield of difficulty is low, and production cost is higher.
Summary of the invention
The purpose of this utility model is to overcome the shortcoming and defect that existing fused biconical taper technology exists, propose a kind of crystal-type 2*2 with isolation features and protect polarisation coupling mechanism, its forward transfer function of realizing adopts the polarization-maintaining fiber coupler of fused biconical taper method identical with tradition, and polarization extinction ratio is higher, temperature performance is stable; Reverse transfer has single-stage or twin-stage isolation performance simultaneously, and isolation can be greater than 45dB.
For achieving the above object, the utility model proposes a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features, it is characterized in that: comprise the first polarization-maintaining dual fiber collimator, the first light polarization light splitting barrier assembly, the second light polarization light splitting barrier assembly and the second polarization-maintaining dual fiber collimator that along light path, set gradually; The polarization beam apparatus that the first described light polarization light splitting barrier assembly, the second light polarization light splitting barrier assembly consist of the first angle of wedge sheet, the second angle of wedge sheet (be the angle of wedge to) respectively and be located at a slice magnetic opticity crystal composition in the middle of the first angle of wedge sheet, the second angle of wedge sheet; The first described angle of wedge sheet, the optical axis included angle of the second angle of wedge sheet are at 45 °, the optical axis of the second angle of wedge sheet of the first described light polarization light splitting barrier assembly becomes an angle [alpha] that can regulate with the optical axis of the first angle of wedge sheet of the second light polarization light splitting barrier assembly, and described α angular range is 0 < α < 90.
Preferably, described light polarization light splitting barrier assembly, for band magnet ring structure, also can be and is not with magnet ring structure,
Further, described the first polarization-maintaining dual fiber collimator and the second polarization-maintaining dual fiber collimator are comprised of lens, optical fiber head, glass tube or metal tube, and described lens, optical fiber head, glass tube or metal tube are by glue bond together.
Further, described lens are C type lens or GRIN Lens.
Further, described optical fiber head is containing angle of wedge angled end-face.
Further, the stress axis of two optical fiber heads of the first described polarization-maintaining dual fiber collimator or the second polarization maintaining optical fiber collimator is orthogonal.
Further, the first described polarization-maintaining dual fiber collimator or the second polarization maintaining optical fiber collimator can adopt two to protect inclined to one side single optical fiber calibrator combination replacement or adopt the combination of two the inclined to one side single optical fiber calibrator of guarantor+roof prisms to replace; In the case, two described stress axiss of protecting inclined to one side single optical fiber calibrator are mutually vertical.
Further, described angle of wedge sheet is birefringece crystal angle of wedge sheet, and is preferably Yttrium Orthovanadate angle of wedge sheet, lithium niobate angle of wedge sheet or quartz crystal angle of wedge sheet.
Adopt technique scheme, the beneficial effect of the crystal-type 2*2 polarization-maintaining coupler with isolation features described in the utility model is: the first polarization-maintaining dual fiber collimator, the first light polarization light splitting barrier assembly, the second light polarization light splitting barrier assembly and the second polarization-maintaining dual fiber collimator are after debugging optical index, can assemble by welding technology or the complete full adhesive process of glass, process stabilizing, dependable performance.In addition, the utility model scheme does not change Stress Profile for Polarization-Maintaining axle zone state, and it is not impaired that optical fiber cable is protected inclined to one side ability; And the extinction ratio performance of optical crystal type is stable, therefore the polarization-maintaining coupler of comparable traditional fused tapered has higher extinction ratio, output splitting ratio can be by regulating the angle of the angle of wedge sheet optical axis of the first light polarization light splitting barrier assembly and the angle of wedge sheet optical axis of the second light polarization light splitting barrier assembly to realize, and process operation is simpler, flexible; And the reverse transfer of a light polarization light splitting barrier assembly is the equal of through the isolator of a single-stage, thereby the technical program can realize the function that oppositely has twin-stage isolation.
Accompanying drawing explanation
Fig. 1 is the crystal-type 2*2 polarization-maintaining coupler cross-sectional view of the utility model band isolation features;
Fig. 2 is the light path transmission structure schematic diagram of described light polarization light splitting barrier assembly;
Fig. 3 is the orthogonal schematic diagram of two optical fiber head stress axiss of polarization-maintaining dual fiber collimator;
Fig. 4 is a kind of light polarization light splitting barrier assembly forward, reverse transfer schematic diagram;
Fig. 5 is that two inclined to one side single optical fiber calibrator+roof prisms of guarantor combine the mode schematic diagram that substitutes polarization-maintaining dual fiber collimator.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As shown in Figure 1, Figure 3, the crystal-type 2*2 polarization-maintaining coupler with isolation features comprises the first polarization-maintaining dual fiber collimator 11, the first light polarization light splitting barrier assembly 12, the second light polarization light splitting barrier assembly 13 and the second polarization-maintaining dual fiber collimator 14 setting gradually along light path; The first described light polarization light splitting barrier assembly 12 comprises optical axis two angle of wedge sheets 04,05 at 45 °, and is located at a magnetic opticity crystal 03 of 04,05 of two angle of wedge sheet; Equally, the second light polarization light splitting barrier assembly 13 comprises optical axis two angle of wedge sheets 06,07 at 45 °; And be located at a magnetic opticity crystal 03 of 06,07 of two angle of wedge sheet, the first concrete polarization-maintaining dual fiber collimator 11 and the second polarization-maintaining dual fiber collimator 14 have comprised that protecting inclined to one side double optical fiber head 01, lens 02, glass tube or metal tube forms, and stick with glue knot.
In addition, first, second polarization-maintaining dual fiber collimator can adopt two to protect inclined to one side single optical fiber calibrator combination replacement or adopt the combination of two the inclined to one side single optical fiber calibrator of guarantor+roof prisms to replace; In the case, two described stress axiss of protecting inclined to one side single optical fiber calibrator are mutually vertical.
As shown in the forward light path transmission structure schematic diagram of Fig. 2 the utility model light polarization light splitting barrier assembly, flashlight is from protecting partially two optical fiber S1 and S2 input, emergent light S3 and S4 enter the first light polarization light splitting barrier assembly 12 and close bundle, emergent light S5 enters the second light polarization light splitting barrier assembly 13 and carries out light splitting, be divided into the mutually perpendicular flashlight S6 of two bundle polarization states and S7, receive and enter the partially two optical fiber cable S8 of guarantor and S9.Wherein, angle of wedge sheet 05 optical axis and angle of wedge sheet 06 optical axis included angle are α, and α angular range is 90 ° of 0 < α <.By changing α, can realize the splitting ratio power stage that S8 is different from S9.For example, when α is 45 °, the output power of S8 and S9 is suitable.And when reverse transfer, as shown in Figure 4, due to the nonreciprocity of gyrotropi crystal, light beam two optical fiber that can not be coupled back, thereby there is the performance of reverse high-isolation.
Visible just like upper scheme, while manufacturing crystal-type guarantor polarisation coupling mechanism, without using oxyhydrogen flame or electric arc to carry out heat treated to optical fiber, technique is relatively simple, and production cost is lower.And by changing angle of wedge sheet 05 optical axis and angle of wedge sheet 06 optical axis included angle α, can change output splitting ratio, flexible adjustment is convenient, and the extinction ratio of photo-coupler is higher, and performance is more stable.Reverse transfer has single-stage or twin-stage isolation performance simultaneously, and isolation can be greater than 45dB.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but those skilled in the art should be understood that; within not departing from the spirit and scope of the present utility model that appended claims limits; in the form and details the utility model is made a variety of changes, be protection domain of the present utility model.
Claims (10)
1. with a crystal-type 2*2 polarization-maintaining coupler for isolation features, it is characterized in that: comprise the first polarization-maintaining dual fiber collimator, the first light polarization light splitting barrier assembly, the second light polarization light splitting barrier assembly and the second polarization-maintaining dual fiber collimator that along light path, set gradually; The polarization beam apparatus that the first described light polarization light splitting barrier assembly, the second light polarization light splitting barrier assembly consist of the first angle of wedge sheet, the second angle of wedge sheet respectively and be located at a slice magnetic opticity crystal composition of the first angle of wedge sheet, second in the middle of angle of wedge sheet; The first described angle of wedge sheet, the optical axis included angle of the second angle of wedge sheet are at 45 °, the optical axis of the second angle of wedge sheet of the first described light polarization light splitting barrier assembly becomes an angle [alpha] that can regulate with the optical axis of the first angle of wedge sheet of the second light polarization light splitting barrier assembly, and described α angular range is 90 ° of 0 < α <.
2. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 1, is characterized in that: described light polarization light splitting barrier assembly is band magnet ring structure.
3. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 1, it is characterized in that: described the first inclined to one side single optical fiber calibrator of guarantor or the second polarization-maintaining dual fiber collimator are comprised of lens, optical fiber head, glass tube or metal tube, and described lens, optical fiber head, glass tube or metal tube are by glue bond together.
4. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 3, is characterized in that: described lens are C type lens or GRIN Lens, and described optical fiber head is containing angle of wedge angled end-face.
5. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 1, is characterized in that: the stress axis of the first described inclined to one side single optical fiber calibrator of guarantor and two optical fiber heads of the second polarization-maintaining dual fiber collimator is orthogonal.
6. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 1, is characterized in that: the first described inclined to one side single optical fiber calibrator of guarantor or the second polarization-maintaining dual fiber collimator adopt two to protect inclined to one side single optical fiber calibrators combination replacement.
7. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 1, is characterized in that: the first described inclined to one side single optical fiber calibrator of guarantor or the second polarization-maintaining dual fiber collimator adopt two to protect inclined to one side single optical fiber calibrator+roof prisms combination replacement.
8. according to a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features described in claim 6 or 7, it is characterized in that: the first described inclined to one side single optical fiber calibrator of guarantor and the stress axis of the second polarization-maintaining dual fiber collimator are mutually vertical.
9. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 1, is characterized in that: described angle of wedge sheet is birefringece crystal angle of wedge sheet.
10. a kind of crystal-type 2*2 polarization-maintaining coupler with isolation features according to claim 9, is characterized in that: described birefringece crystal angle of wedge sheet can be Yttrium Orthovanadate angle of wedge sheet, lithium niobate angle of wedge sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420212245.6U CN203799051U (en) | 2014-04-29 | 2014-04-29 | Crystal-type 2*2 polarization-maintaining coupler with isolation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420212245.6U CN203799051U (en) | 2014-04-29 | 2014-04-29 | Crystal-type 2*2 polarization-maintaining coupler with isolation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203799051U true CN203799051U (en) | 2014-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420212245.6U Expired - Lifetime CN203799051U (en) | 2014-04-29 | 2014-04-29 | Crystal-type 2*2 polarization-maintaining coupler with isolation function |
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| Country | Link |
|---|---|
| CN (1) | CN203799051U (en) |
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2014
- 2014-04-29 CN CN201420212245.6U patent/CN203799051U/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |