CN203164471U - Crystal type polarization-maintaining coupler - Google Patents
Crystal type polarization-maintaining coupler Download PDFInfo
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- CN203164471U CN203164471U CN 201320222670 CN201320222670U CN203164471U CN 203164471 U CN203164471 U CN 203164471U CN 201320222670 CN201320222670 CN 201320222670 CN 201320222670 U CN201320222670 U CN 201320222670U CN 203164471 U CN203164471 U CN 203164471U
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Abstract
A crystal type polarization-maintaining coupler is characterized by comprising a first polarization-maintaining single-fiber collimator, a polarizing film, at least one polarization beam splitter formed by a wedge angle pair and a second polarization-maintaining double-fiber collimator which are sequentially arranged along an optical path. A stress axis of the first polarization-maintaining single-fiber collimator is parallel to an optical axis of the polarizing film, and the wedge angle pair has two birefringence crystal wedge angle sheets of which optical axes are mutually vertical. After optical indexes are debugged, the assembled crystal type polarization-maintaining coupler can be assembled through a welding technology or an all-glass all-rubber technology and is stable in technology and reliable in performance. In addition, the state of a stress axis area of a polarization maintaining fiber is not changed and a polarization-maintaining capability of a fiber is not damaged; the optics crystal type polarization-maintaining coupler is stable in extinction ratio and performance and has an extinction ratio higher than that of a traditional fused biconical taper type polarization-maintaining coupler; an output splitting ratio can be changed by regulating an inclined angle between the optical axis of polarizing film and the optical axis of one wedge angle sheet; and the optics crystal type polarization-maintaining coupler is characterized in that a technological operation method is simple, flexible and the like.
Description
Technical field
The utility model relates to optical field, specifically, relates to a kind of crystal type polarization-maintaining coupler.
Background technology
Polarization maintaining optical fibre is the optical fiber that can keep the original polarization state transmission of light wave, normal this polarization maintaining optical fibre that uses of existing fiber network transmission, require simultaneously incident light is carried out optical power adjustment, make the light splitting luminous power of outgoing meet certain requirements, so polarization-maintaining coupler arises at the historic moment.
Chinese invention patent " manufacture method of polarization-maintaining fiber coupler ", publication number is CN101162281, discloses a kind of manufacture method of polarization-maintaining fiber coupler, and it adopts the fused biconical taper scheme, and concrete grammar is: the part coat of removing the fibre cladding outside; Every optical fiber is removed the part of coat and carried out the drawing-down processing; Part after multifiber carry out drawing-downization is close together and carries out fused biconical taper and handle; Wherein, in the drawing-down processing procedure, along described optical fiber axially clip the part covering, and the amputation part is along the radius of optical fiber thickness radially less than optical fiber.
Yet above-mentioned fused tapered scheme need 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, the temperature performance instability.In addition, make this photo-coupler and need use oxyhydrogen flame or electric arc processes, the big yield of difficulty is low, and production cost is than higher.
The utility model content
The purpose of this utility model is to overcome the shortcoming and defect that prior art exists, and provide a kind of function that realizes identical with the polarization-maintaining fiber coupler that adopts the fused biconical taper method, and polarization extinction ratio is higher, the crystal type polarization-maintaining coupler that temperature performance is stable.
For achieving the above object, the technical scheme that the utility model proposes is: a kind of crystal type polarization-maintaining coupler, it is characterized in that: comprise along light path set gradually first protect inclined to one side single fiber collimating apparatus, polaroid, at least one is by polarization beam apparatus and second polarization-maintaining dual fiber collimator of the angle of wedge to constituting, the stress axis of the inclined to one side single fiber collimating apparatus of described first guarantor is parallel with the optical axis of polaroid, and the described angle of wedge is to being the orthogonal two birefringece crystal angle of wedge sheets of optical axis.
Further, the described first inclined to one side single fiber collimating apparatus of guarantor or second polarization-maintaining dual fiber collimator are made up 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 contains angle of wedge angled end-face.
Further, the stress axis of two optical fiber heads of described second polarization-maintaining dual fiber collimator is orthogonal.
Further, described second polarization-maintaining dual fiber collimator can adopt two to protect inclined to one side single fiber collimator arrangement replacement or adopt two to protect inclined to one side single fiber collimating apparatuss+roof prisms combination replacement; In the case, the stress axiss of described two inclined to one side single fiber collimating apparatuss of guarantor are vertical mutually.
Further, described angle of wedge sheet is vanadic acid yttrium angle of wedge sheet, lithium niobate angle of wedge sheet or quartz crystal angle of wedge sheet.
Adopt technique scheme, the beneficial effect of crystal type polarization-maintaining coupler described in the utility model is: above-mentioned crystal type polarization-maintaining coupler assembles by after the 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 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, and therefore the polarization-maintaining coupler of comparable traditional fused tapered has higher extinction ratio; Export splitting ratio simultaneously and can have characteristics such as process operation is simpler, flexible by regulating the angle of polaroid and angle of wedge sheet optical axis.
Description of drawings
Fig. 1 is crystal type polarization-maintaining coupler structural representation described in the utility model;
Fig. 2 is described crystal type polarization-maintaining coupler light path transmission structure synoptic diagram;
Fig. 3 is the orthogonal synoptic diagram of stress axis of two optical fiber heads of polarization-maintaining dual fiber collimator.
Fig. 4 is two and protects the synoptic diagram that inclined to one side single fiber collimating apparatus+roof prisms make up to substitute the mode of polarization-maintaining dual fiber collimator.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As Fig. 1, shown in Figure 3, crystal type polarization-maintaining coupler comprise along light path set gradually first protect inclined to one side single fiber collimating apparatus 11, polaroid 14, at least one is by polarization beam apparatus 13 and second polarization-maintaining dual fiber collimator 12 of the angle of wedge to constituting, the stress axis of the inclined to one side single fiber collimating apparatus 11 of first guarantor is parallel with the optical axis of polaroid 14, and the described angle of wedge is the orthogonal two birefringece crystal angle of wedge sheets 104,105 of optical axis to 13; The concrete inclined to one side single fiber collimating apparatus 11 of first guarantor comprises that protecting inclined to one side single fiber head 101, lens 102, glass tube or metal tube forms, and sticks with glue knot; Second polarization-maintaining dual fiber collimator 12 comprises that protecting inclined to one side double optical fiber head 102, lens 103, glass tube or metal tube forms, and sticks with glue knot.
In addition, second polarization-maintaining dual fiber collimator can adopt two to protect inclined to one side single fiber collimator arrangement replacement or adopt two to protect inclined to one side single fiber collimating apparatuss+roof prisms combination replacement; In the case, the stress axiss of described two inclined to one side single fiber collimating apparatuss of guarantor are vertical mutually.
Shown in Fig. 2 the utility model light path transmission structure synoptic diagram, flashlight is from protecting inclined to one side single fiber 301 inputs, carry out light splitting through entering the angle of wedge behind the polaroid 14 to 14, be divided into the mutually perpendicular flashlight of two bundle polarization states, receive to enter and protect two partially optical fiber cables 302 and 303.Wherein, polaroid 13 optical axises are parallel with inclined to one side single fiber collimating apparatus 11 stress axiss of guarantor, and polaroid 14 optical axises and angle of wedge sheet 104 optical axis included angles are α, can realize the 302 splitting ratio power outputs different with 303 by changing α.When for example α was 45 °, 302 and 303 output power was suitable.
As above as seen scheme when making crystal type guarantor polarisation coupling mechanism, need not to use oxyhydrogen flame or electric arc that optical fiber is carried out heat treated, and technology is simple relatively, and production cost is lower.And can change the output splitting ratio by changing the polaroid optical axis with angle of wedge sheet optical axis included angle α, it is flexible to have an adjusting, and advantage such as the extinction ratio of photo-coupler is higher, and performance is more stable.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in not breaking away 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 (9)
1. crystal type polarization-maintaining coupler, it is characterized in that: comprise along light path set gradually first protect inclined to one side single fiber collimating apparatus, polaroid, at least one is by polarization beam apparatus and second polarization-maintaining dual fiber collimator of the angle of wedge to constituting, the stress axis of the inclined to one side single fiber collimating apparatus of described first guarantor is parallel with the optical axis of polaroid, and the described angle of wedge is to being the orthogonal two birefringece crystal angle of wedge sheets of optical axis.
2. a kind of crystal type polarization-maintaining coupler according to claim 1, it is characterized in that: the described first inclined to one side single fiber collimating apparatus of guarantor or second polarization-maintaining dual fiber collimator are made up 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.
3. a kind of crystal type polarization-maintaining coupler according to claim 2, it is characterized in that: described lens are C type lens or GRIN Lens.
4. a kind of crystal type polarization-maintaining coupler according to claim 2, it is characterized in that: described optical fiber head contains angle of wedge angled end-face.
5. a kind of crystal type polarization-maintaining coupler according to claim 1, it is characterized in that: the stress axis of two optical fiber heads of described second polarization-maintaining dual fiber collimator is orthogonal.
6. a kind of crystal type polarization-maintaining coupler according to claim 1 is characterized in that: the inclined to one side single fiber collimator arrangement replacement of two guarantors of described second polarization-maintaining dual fiber collimator employing.
7. a kind of crystal type polarization-maintaining coupler according to claim 1 is characterized in that: two inclined to one side single fiber collimating apparatuss of guarantor of described second polarization-maintaining dual fiber collimator employing+roof prisms combination replacement.
8. according to claim 6 or 7 described a kind of crystal type polarization-maintaining couplers, it is characterized in that: described two stress axiss of protecting inclined to one side single fiber collimating apparatus are vertical mutually.
9. a kind of crystal type polarization-maintaining coupler according to claim 1, it is characterized in that: described angle of wedge sheet is vanadic acid yttrium angle of wedge sheet, lithium niobate angle of wedge sheet or quartz crystal angle of wedge sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320222670 CN203164471U (en) | 2013-04-27 | 2013-04-27 | Crystal type polarization-maintaining coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320222670 CN203164471U (en) | 2013-04-27 | 2013-04-27 | Crystal type polarization-maintaining coupler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203164471U true CN203164471U (en) | 2013-08-28 |
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ID=49025648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320222670 Expired - Lifetime CN203164471U (en) | 2013-04-27 | 2013-04-27 | Crystal type polarization-maintaining coupler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203164471U (en) |
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2013
- 2013-04-27 CN CN 201320222670 patent/CN203164471U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
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| CX01 | Expiry of patent term |