CN2498624Y - Polarization splitting/merging device - Google Patents
Polarization splitting/merging device Download PDFInfo
- Publication number
- CN2498624Y CN2498624Y CN 01255623 CN01255623U CN2498624Y CN 2498624 Y CN2498624 Y CN 2498624Y CN 01255623 CN01255623 CN 01255623 CN 01255623 U CN01255623 U CN 01255623U CN 2498624 Y CN2498624 Y CN 2498624Y
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- CN
- China
- Prior art keywords
- wedge
- polarized light
- longitudinal axis
- combination device
- light separation
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Abstract
The utility model discloses a polarized optical splitter or coupler, comprising elements arranged along a longitudinal axis, namely, a dual fiber collimator arranged at one end of the longitudinal axis, a single fiber collimator arranged at the other end of the longitudinal axis and a first optical wedge and a second optical wedge, similar in shape and arranged between the two collimators. The bevels of the two wedges are adjacent and parallel; the right-angle side corresponding to the bevel of each wedge is opposite to one collimator. One of the two optical wedges is made from isotropic medium and the other is made from a birefringent crystal. The isotropic medium of one wedge is much lower in price than the birefringent crystal of the other wedge and is easier for production, therefore the cost of the whole apparatus is much reduced and the extinction ratio can be more than 60dB.
Description
(1) technical field
The utility model relates to optical passive component, more particularly, relates to polarized light separation/combination device.
(2) background technology
Polarized light separation/combination device is widely used in raman amplifier, Erbium-Doped Fiber Amplifier (EDFA) and light up and down in the device such as add-drop multiplexer.In US Patent specification 6282025, disclosed polarized light separation/combination device, what adopt in its structure is the wedge that is made into by two blocks of birefringece crystals, forms a wollaston prism, the effect of playing beam split or closing light.The polarized light separation/combination utensil of this structure has volume little, light path symmetry, compact conformation, advantage such as extinction ratio is big, and Insertion Loss is little, and technology is simple.But because its wedge employing is the birefringece crystal material, cost an arm and a leg, processed complex causes whole spectral/splicer device cost to increase.
(3) summary of the invention
In order to overcome above shortcoming, the utility model provides a kind of handling ease, the polarized light separation/combination device that cost is low.
The utility model adopts following technical scheme: a kind of polarized light separation/combination device comprises longitudinally the following elements that axle is arranged: a double-fiber collimator is positioned at an end of described longitudinal axis; One single fiber collimating apparatus is positioned at the other end of described longitudinal axis; Between described two collimating apparatuss, be provided with shape similar first wedge and second wedge, its inclined-plane is adjacent and parallel, lens with described two collimating apparatuss are relative respectively with the inclined-plane is relative separately right-angle side, these two wedges, wherein any one is the isotropic medium material, and another piece is a birefringece crystal.
Because the shape of two wedges in the utility model polarized light separation/combination device structure is similar, the light path symmetry, Insertion Loss is little; Again because two wedges in the utility model structure are not that what adopt fully is birefringece crystal, and what adopt is that wherein a wedge is for processing is simple, the price isotropic medium material more much lower than birefringece crystal, thereby the cost of entire device is reduced, and have very high extinction ratio, surpass 60dB.
(4) description of drawings
The polarized light separation/combination device structural representation of Fig. 1 prior art;
Fig. 2 is a polarized light separation/combination device structural representation of the present utility model.
(5) embodiment
Describe the utility model most preferred embodiment in detail below in conjunction with accompanying drawing.
By US Patent specification shown in Figure 1 6282025 disclosed polarized light separation/combination devices 100, the following device of axle 112 arrangements longitudinally comprises: the tail optical fiber 104 and first collimation lens 108 of band single fiber 102; The wollaston prism of forming by two two refracting crystal wedges 110; Be with second tail optical fiber 124 and second collimation lens 118 of two optical fiber 120 and 122.The natural light 106 that sends from first optical fiber 102 through first lens, 108 collimations, becomes the bigger light of beam area and propagates after 104 outgoing of first tail optical fiber.When arriving two wedge interphases of wollaston prism 110, because the birefringence effect of crystal, natural light is divided into the polarized light 114 and 116 of two bundle polarization direction quadratures, and the angle that this two bundles polarized light 114 and 116 is refracted is also different, and the two optical fiber 120 and 122 that arrive second tail optical fiber 124 after 118 couplings of second lens respectively transfer out.
For polarized light separation/combination device 100 close the light function, light path is just in time opposite.From two optical fiber 120 of second tail optical fiber 124 and two bundle polarized lights 114 and 116 of 122 outgoing an angle is arranged.When this two bundles polarized light was arrived 110 liang of wedge interphases of wollaston prism by second lens, 118 collimation backs, because the birefringence effect of crystal, this two bundles polarized light was refracted to same direction, has become a branch of light 106.This a branch of light arrives first tail optical fiber 104 after 108 couplings of first lens, and transfers out through its single fiber 102.
By polarized light separation/combination device 200 of the present utility model shown in Figure 2, comprise that longitudinally an axle O-O arranges following element: double-fiber collimator 224, first wedge 210, second wedge 230 and single fiber collimating apparatus 204.The collimating apparatus 204 of band single fiber 202 is positioned at the end of longitudinal axis O-O; Two optical fiber 222 of band and 220 collimating apparatus 224 are positioned at this other end; By first wedge 210 that the birefringece crystal material constitutes, its right-angle side 212 is relative with the lens of double-fiber collimator 224; Shape and first wedge 210 second similar wedge 230 are positioned at a side of the lens of single fiber collimating apparatus 204, its inclined-plane 231 parallels with the inclined-plane 211 of first wedge 210, its material is BaK 1 glass material, and this glass material also can be substituted by the crystal of other isotropic medium material; The inclined- plane 211 and 231 of two wedges is close together during assembling, if with first wedge 210 and second wedge 230 along O-O axle axial translation one segment distance, keep their inclined-plane 211,231 parallel, can not exert an influence to light path, the just polarization mode dispersion of entire device at this moment (PDL), insertion loss and return loss are all bigger.
In polarized light separation/combination device 200 structures of the foregoing description, if first wedge 210 is made as isotropic body or glass, and second wedge 230 is made as the birefringece crystal material, then the effect of the branch actinic light of entire device can not change.
The polarized light separation/combination device 200 of present embodiment structure, although wherein the material of a wedge adopts is isotropic medium, its index path and aforementioned us patent specification 6282025 disclosed index paths are just the same, do not repeat them here.
In the present embodiment, the collimation lens that is adopted can be non-spherical lens, C lens, Green lens or other standard lens.
Polarized light separation/combination device of the present utility model, because two wedges in the structure are not that what adopt fully is birefringece crystal, and adopt be wherein a wedge for processing is simple, also much lower than the birefringece crystal isotropic medium material of price, thereby the cost of entire device is reduced.
Claims (4)
1, a kind of polarized light separation/combination device (200) comprises the following elements of arranging along the O-O longitudinal axis:
One double-fiber collimator (224) is positioned at an end of described longitudinal axis;
One single fiber collimating apparatus (204) is positioned at the other end of described longitudinal axis;
Between described two collimating apparatuss, be provided with similar first wedge (210) of shape and second wedge (230), its inclined-plane (211), (231) are adjacent and parallel, and the lens with described collimating apparatus (224), (204) are relative respectively with the inclined-plane is relative separately right-angle side (212), (232)
It is characterized in that, described wedge (210) and (230), wherein any one is the isotropic medium material, another piece is a birefringece crystal.
2, polarized light separation/combination device according to claim 1 (200) is characterized in that, the material of described second wedge (230) is the isotropic medium material.
3, polarized light separation/combination device according to claim 1 (200) is characterized in that, the material of described first wedge (230) is the isotropic medium material.
4, polarized light separation/combination device according to claim 1 (200) is characterized in that, described isotropic medium material is a glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01255623 CN2498624Y (en) | 2001-09-11 | 2001-09-11 | Polarization splitting/merging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01255623 CN2498624Y (en) | 2001-09-11 | 2001-09-11 | Polarization splitting/merging device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2498624Y true CN2498624Y (en) | 2002-07-03 |
Family
ID=33664729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01255623 Expired - Lifetime CN2498624Y (en) | 2001-09-11 | 2001-09-11 | Polarization splitting/merging device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2498624Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269876A (en) * | 2011-08-22 | 2011-12-07 | 北京理工大学 | System for generating vector beam by using Wollaston prism combined beam |
| CN102621637A (en) * | 2012-04-11 | 2012-08-01 | 珠海保税区光联通讯技术有限公司 | Crystal polarization maintaining fiber coupler and manufacturing method thereof |
-
2001
- 2001-09-11 CN CN 01255623 patent/CN2498624Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102269876A (en) * | 2011-08-22 | 2011-12-07 | 北京理工大学 | System for generating vector beam by using Wollaston prism combined beam |
| CN102269876B (en) * | 2011-08-22 | 2014-06-11 | 北京理工大学 | System for generating vector beam by using Wollaston prism combined beam |
| CN102621637A (en) * | 2012-04-11 | 2012-08-01 | 珠海保税区光联通讯技术有限公司 | Crystal polarization maintaining fiber coupler and manufacturing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20110911 Granted publication date: 20020703 |
|
| DD01 | Delivery of document by public notice |
Addressee: Cheng Xuebi Document name: Notification of Expiration of Patent Right Duration |