CN201955581U - Free space polarization sensitive photocoupler - Google Patents
Free space polarization sensitive photocoupler Download PDFInfo
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- CN201955581U CN201955581U CN2011200581904U CN201120058190U CN201955581U CN 201955581 U CN201955581 U CN 201955581U CN 2011200581904 U CN2011200581904 U CN 2011200581904U CN 201120058190 U CN201120058190 U CN 201120058190U CN 201955581 U CN201955581 U CN 201955581U
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- refraction crystal
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Abstract
The utility model relates to a free space polarization sensitive photocoupler, which structurally comprises a flat-plate double-refraction crystal, a wedge-shaped double-refraction crystal and a 45-degree Faraday rotator which are distributed along an optical axis. The 45-degree Faraday rotator is arranged between the flat-plate double-refraction crystal and the wedge-shaped double-refraction crystal, the 45-degree Faraday rotator, the flat-plate double-refraction crystal and the wedge-shaped double-refraction crystal are adhered integrally, the optical axis of the flat-plate double-refraction crystal is arranged in an incidence plane, a 45-degree included angle is formed between the optical axis of the flat-plate double-refraction crystal and the incidence surface of the double-refraction crystal, and the optical axis direction of the wedge-shaped double-refraction crystal and the optical axis direction of the flat-plate double-refraction crystal rotate around an optical path transmitting shaft by 45 degrees. The free space polarization sensitive photocoupler not only can avoid influence of return light of follow-up optical components to light-emitting components, but also greatly reduces intervals of products.
Description
Technical field
The utility model relates to optical field, specially refers to the design and the application of a kind of communication and industrial optoisolator.
Background technology
Optoisolator is in optical communication and the widespread use of industrial lasers application, it is a kind of optical passive component of nonreciprocal transmission light, be used to allow the forward transmitted light positive often by this product, and be coupled in the output waveguide, stop reverse transfer to couple light in the input waveguide simultaneously, cause optical system (especially laser instrument) job insecurity.In the practical application at present, consist predominantly of line style (polarization is uncorrelated) and free space type (polarization is relevant) two classes, and in individual laser package, mainly use free space type (polarization is relevant).
A large amount of at present commercial free space isolators adopt two polaroids and 45 ° of Faraday polarization apparatus of a slice to form, 45 ° of faraday are placed between two polaroids, the polarization direction of two polaroids differ 45o ° when light positive to when transmission, incident light passes through polaroid with first parallel part in polaroid polarization direction, the part vertical with the polarization direction is polarized sheet and absorbs, light by polaroid enters behind the Faraday polarization apparatus under the Faraday effect effect 45 ° of rotations, just in time parallel with the polarization direction of second polaroid, therefore can pass through second polaroid losslessly.When the light reverse transfer, the part vertical with second polaroid polarization direction directly is polarized sheet and absorbs, and the part parallel with the polarization direction is lossless to be seen through, and enters Faraday polarization apparatus then; Because the sense of rotation of Faraday polarization apparatus only is decided by magnetic direction, can not change along with the incident direction of light, therefore continue that the same direction rotation arrives first polaroids for 45 ° along with forward transmitted the time, this moment, polarization state of light was vertical with the polarization direction of first polaroid, light is absorbed by first polaroid, can not project in the input waveguide.But the cost of this design proposal is higher.
Therefore, when adopting low-cost design, need guarantee that the performance parameters of product does not reduce by appropriate design, to satisfy actual request for utilization.
Summary of the invention
The purpose of this utility model is to overcome the deficiency that above-mentioned prior art exists, and a kind of optoisolator of new version is provided.Free space polarization relationship type optoisolator of the present utility model is intended to improve the performance of optoisolator, and can reduce cost of manufacture.
In order to reach the foregoing invention purpose, the technical scheme that the utility model provides is as follows:
A kind of free space polarization relationship type optoisolator, it is characterized in that, the structure of this optoisolator includes a dull and stereotyped birefringece crystal, a birefringent wedge crystal and the 45 ° of Faraday rotators that distribute along optical axis, described 45 ° of Faraday rotators are arranged at the centre of dull and stereotyped birefringece crystal and birefringent wedge crystal, and the three is bonded to one; The optical axis of described dull and stereotyped birefringece crystal in the plane of incidence, and with the incidence surface of birefringece crystal angle at 45, the optical axis direction of described birefringent wedge crystal and the optical axis direction of described dull and stereotyped birefringece crystal are along 45 ° of light path propagation axis rotations.
In the utility model, compose one by gummed or optical cement between described parallel double refracting crystal, 45 ° of Faraday rotators and the birefringent wedge crystal.
Based on the foregoing invention content, free space polarization relationship type optoisolator of the present utility model is compared with optoisolator of the prior art has following technological merit:
The utility model utilizes laterally walking from principle to realize isolating the purpose of return light of birefringece crystal, the structure of optoisolator is the dull and stereotyped birefringece crystal of a slice that bonds together, a slice Faraday polarization apparatus and a slice birefringent wedge crystal are isolated to realize maximum light.By the said structure design, we have reduced cost on the one hand, adopt birefringece crystal to improve signal transmission quality in addition, reduce return loss.
Description of drawings
Fig. 1 is the birefringent characteristic synoptic diagram of birefringece crystal.
Fig. 2 is that light moves towards synoptic diagram after by the birefringent wedge crystal.
Fig. 3 is the structural representation of free space polarization relationship type optoisolator of the present utility model.
Fig. 4 is a utility model free space polarization relationship type optoisolator birefringent wedge optical axis of crystal synoptic diagram.
Fig. 5 is the light path principle figure of common free space polarization relationship type optoisolator.
Fig. 6 is the actual use synoptic diagram of the utility model free space polarization relationship type optoisolator.
Embodiment
Below we come the structure of free space polarization relationship type optoisolator of the present utility model and make to be used as further to elaborate with specific embodiment in conjunction with the accompanying drawings; understand the utility model in the hope of more well-known, but can not limit protection domain of the present utility model with this.
Based on general optical principle, as shown in Figure 1, when a branch of natural light is incident in the parallel double refracting crystal, two bundle refract lights be can become, e light and o light are called, wherein o ordinary light only, identical along the different directions velocity of propagation, e light is extraordinary ray, and e light is along different directions propagation rate difference.O light, e light all are linearly polarized lights, and the direction of vibration of o light is perpendicular to the principal plane of o light, and the direction of vibration of e light is in the principal plane of e light.
And a branch of natural light is when being incident to the birefringent wedge crystal, and as shown in Figure 2, deviation can take place this bundle natural light light after by the birefringent wedge crystal, θ among the figure ≠ θ ` and θ `〉θ, θ represents the inclined degree on birefringent wedge crystal inclined-plane, and θ ` is output ray refraction angle, wherein
Angle for output light and former incident direction.The utility model is exactly to utilize laterally the walking from principle of above-mentioned birefringece crystal, has designed free space polarization relationship type optoisolator, and its structure as shown in Figure 3.
Include the dull and stereotyped birefringece crystal of of distributing along optical axis 1, birefringent wedge crystal 3 and 45 ° of Faraday rotators 2 on the free space polarization relationship type optical isolator structure of the present utility model.
Wherein, 45 ° of Faraday rotators 2 are arranged at the centre of dull and stereotyped birefringece crystal 1 and birefringent wedge crystal 3, and the three is bonded to one.The three utilizes optical cement to be bonded together, and is perhaps glued together.When the three bonds together, can reduce the volume of optoisolator greatly, for its widespread use provides prerequisite.
In above-mentioned optoisolator, the optical axis of dull and stereotyped birefringece crystal 1 in the plane of incidence of dull and stereotyped birefringece crystal 1, and with the incidence surface of dull and stereotyped birefringece crystal 1 angle at 45.The optical axis direction of described birefringent wedge crystal and the optical axis direction of described dull and stereotyped birefringece crystal are along 45 ° of light path propagation axis rotations.
Check said structure relation from the another one angle: the optical axis of dull and stereotyped birefringece crystal is in the plane of incidence, and is promptly at 45 with the Y-axis angle and in the surperficial shape angle at 45 of birefringece crystal, with the angle of Z axle be 135 °; The optical axis direction of birefringent wedge crystal has rotated 45 ° with respect to dull and stereotyped birefringece crystal around the Z axle, is 60 ° with the Y-axis angle promptly, with the X-axis angle be 60 °, with Z axle clamp angle be 135 °, as shown in Figure 4.
Below we further set forth its course of work, when light positive to when transmission, after the light of incident light by the parallel double refracting crystal enters 45 ° of Faraday polarization apparatus, rotation is 45 ° under 45 ° of Faraday effect effects, make it in the birefringent wedge crystal, still keep identical polarized light state, normally by the birefringent wedge crystal.
When the light reverse transfer, first, when light is mapped to the birefringent wedge crystal according to o illumination, light is followed refraction law, no transversal displacement ground is by the birefringent wedge crystal, after in 45 ° of Faraday polarization apparatus, rotating 45 °, the transmission mode of light in the parallel double refracting crystal becomes e light, this moment, refraction law was not followed in the transmission of light, and owing to optical axis and incidence surface have 45 ° of angles that transversal displacement takes place, the outgoing position of light departs from the incident waveguide, and then can not be coupled in the input waveguide, reaches the isolation purpose; Second, when light is mapped to the birefringent wedge crystal according to e illumination, refraction law is not followed in the transmission of light, and because optical axis and incidence surface have 45 ° of angles and transversal displacement take place when output birefringent wedge crystal, after in 45 ° of Faraday polarization apparatus, rotating 45 °, the transmission mode of light in the parallel double refracting crystal becomes o light, refraction law is followed in the transmission in this time, transversal displacement does not take place during by the parallel double refracting crystal, the transversal displacement amount that forms when therefore the final outgoing position of light keeps birefringent wedge, outgoing position departs from the incident waveguide, and then can not be coupled in the input waveguide, reaches the isolation purpose.
The laser instrument light in actual applications that utilizes said structure to be made into moves towards as shown in Figure 6, and Fig. 6 is the actual use synoptic diagram of the utility model free space polarization relationship type optoisolator.The fiber end face that enters band optical fiber contact pins 6 of deviation takes place through the utility model free space polarization relationship type optoisolator 7 in the light that laser instrument 4 is launched among the figure.And Fig. 5 in contrast thereto, Fig. 5 is the light path principle figure of common free space polarization relationship type optoisolator.The fiber end face that enters band optical fiber contact pins 6 of deviation does not take place through common free space polarization relationship type optoisolator 5 in the light that laser instrument 4 is launched among the figure.
Undoubtedly, free space polarization relationship type optoisolator of the present utility model also has other structures and connected mode except said structure, be not limited to the foregoing description.Generally speaking, the protection domain of optoisolator of the present utility model also comprises other conversion that it will be apparent to those skilled in the art that and substitutes.
Claims (2)
1. free space polarization relationship type optoisolator, it is characterized in that, the structure of this optoisolator includes a dull and stereotyped birefringece crystal, a birefringent wedge crystal and the 45 ° of Faraday rotators that distribute along optical axis, described 45 ° of Faraday rotators are arranged at the centre of dull and stereotyped birefringece crystal and birefringent wedge crystal, and the three is bonded to one; The optical axis of described dull and stereotyped birefringece crystal in the plane of incidence, and with the incidence surface of birefringece crystal angle at 45, the optical axis direction of described birefringent wedge crystal and the optical axis direction of described dull and stereotyped birefringece crystal are along 45 ° of light path propagation axis rotations.
2. a kind of free space polarization relationship type optoisolator according to claim 1 is characterized in that, composes one by gummed or optical cement between described parallel double refracting crystal, 45 ° of Faraday rotators and the birefringent wedge crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200581904U CN201955581U (en) | 2011-03-08 | 2011-03-08 | Free space polarization sensitive photocoupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200581904U CN201955581U (en) | 2011-03-08 | 2011-03-08 | Free space polarization sensitive photocoupler |
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| Publication Number | Publication Date |
|---|---|
| CN201955581U true CN201955581U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200581904U Expired - Lifetime CN201955581U (en) | 2011-03-08 | 2011-03-08 | Free space polarization sensitive photocoupler |
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| CN (1) | CN201955581U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576346A (en) * | 2012-07-26 | 2014-02-12 | 陈国强 | Birefringence crystal displacement compensating mechanism and optical device |
-
2011
- 2011-03-08 CN CN2011200581904U patent/CN201955581U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103576346A (en) * | 2012-07-26 | 2014-02-12 | 陈国强 | Birefringence crystal displacement compensating mechanism and optical device |
| CN103576346B (en) * | 2012-07-26 | 2017-05-24 | 陈国强 | Birefringence crystal displacement compensating mechanism and optical device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HILL MAX TECHNOLOGY LTD. Free format text: FORMER NAME: PINGHU ZHONGTIAN HEBO COMMUNICATION TECHNOLOGY CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 314200, No. 669, Xinxing Road, Pinghu Economic Development Zone, Zhejiang, Jiaxing, China Patentee after: HEBO OPTICAL COMMUNICATION TECHNOLOGY CO., LTD. Patentee after: Innovative Optics (ZheJiang) Co., Ltd. Address before: Pinghu City, Jiaxing City, Zhejiang Province Economic Development Zone 314200 emerging Road No. 669 Du Li Gong Pinghu Kechuang center next to Patentee before: Pinghu Zhongtian Hebo Communication Technology Co., Ltd. Patentee before: Innovative Optics (ZheJiang) Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110831 |