CN1700060A - Total fiber-optical magneto-optical shutter - Google Patents
Total fiber-optical magneto-optical shutter Download PDFInfo
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- CN1700060A CN1700060A CN 200510074523 CN200510074523A CN1700060A CN 1700060 A CN1700060 A CN 1700060A CN 200510074523 CN200510074523 CN 200510074523 CN 200510074523 A CN200510074523 A CN 200510074523A CN 1700060 A CN1700060 A CN 1700060A
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Abstract
The invention relates to an all optical fiber magnetic photo switch. It comprises input polarsing beam-splitting device with input port external with incidence light, two deflecting optical fibers with input port connected with the two polarsing crossed P,S light's output end of polarsing beam-splitting device, two yttrium iron grenade stone which is posited in high-speed magnetic field with the input port connected with the output end of two deflecting optical fibers, the second pair polarsing beam-splitting device with the input end connected with the output end of two yttrium iron grenade stone, two polarsing beam-bonder with the input end connected with the output end of the second pair polarsing beam-splitting device each two polarsing crossed P,S light, two single casting optical fiber with its input end connected with the output of polarsing beam-bonder and its output end outputs polarsing bonding beam.
Description
Technical field
The present invention relates to a kind of magneto-optic shutter, especially relate to a kind of total fiber-optical magneto-optical shutter.
Background technology
In recent years, develop rapidly along with telecommunication and compunication, the transmission of communication network and exchange capacity increase very fast, especially measure based on the data communication flow of Internet/Intranet business and showed explosive growth, traditional transmission system based on electronic applications has been difficult to satisfy the service needed that increases day by day.
All-optical network can increase the optical fiber telecommunications system capacity cost-effectively, has obtained the generally approval of international telecommunication circle.The all constituents of all-optical network all can be realized " transparent ", with data layout, speed and protocol-independent, has become one of common hot spot technology of paying close attention to of various countries' telecommunication department.Key equipments such as the Optical Add/Drop Multiplexer in the all-optical network (OADM), optical cross-connection equipment (OXC) and optical router are mainly used in the exchange between the two-forty signal in the all-optical network, play a part very important in all-optical network.The realization of everything presses for the all-optical switch device of various functional and reasonable prices.The integrated research of all-optical switch and scale thereof has become the bottleneck that breakthrough is badly in need of in the all-optical network construction, has become important research focus of all-optical network and optical passive component and gordian technique difficult point.
All-optical switch need not directly light signal to be outputed to different port according to different requirements by traditional light-electrical-optical conversion regime.Compare with traditional photoswitch, it has saved light-electrical-optical transfer process, and the corresponding simplification of equipment greatly improves the reliability of network, and signal route platform flexibly is provided.Although also adopt traditional light-electrical-optical exchange at present in the communication system, all optical network Luoque needs all-optical switch to replace opto-electronic conversion to finish the signal routing function, realizes the two-forty of network and the transparency of agreement.All-optical switch has become core devices that makes up large-scale optical switching system and the key factor that determines network performance, and its status and importance show especially day by day.
The non-mechanical optical switch two big classes that photoswitch can be divided into traditional mechanical optical switch and study recently substantially at present.The development of mechanical optical switch is the most ripe, and it has, and the loss of insertion is low, polarization irrelevant, the advantage such as little of crosstalking.Weak point is that switching time is long, is generally a millisecond magnitude, differs greatly with microsecond that requires and nanosecond order; Problems such as volume is big, and also existence rebound shake that has and repeatability are relatively poor.Non-mechanical optical switch generally is to utilize effects such as the electric light of material, acousto-optic, hot light and magneto-optic to develop, with respect to mechanical optical switch, they have higher switching speed, generally can reach microsecond level even nanosecond order, can realize that high density is integrated, can be applied to following integrated light exchange and photoelectron exchange system.Weak point is that the insertion loss is big slightly, isolation is low.Present stage comparatively the on-mechanical photoswitch in forward position mems optical switch, liquid crystal optical switch, thermo-optic effect photoswitch, acoustooptic switch and magneto-optic shutter etc. are arranged.
Magneto-optic shutter is that a kind of faraday of utilization (Faraday) magneto-optic effect realizes the all-optical switch that light path is switched.With respect to traditional mechanical optical switch, magneto-optic shutter has the fast and stable high advantage of switching speed; And with respect to other non-mechanical optical switch, it has the low and advantage such as little of crosstalking of driving voltage again.
In existing magneto-optic shutter, usually the components and parts that adopt have magneto-optic memory technique (comprising magneto-optic glass and magneto-optical crystal), polarization to close/beam splitter (comprising polarization beam apparatus and polarization beam combiner), birefringece crystal, λ/4 wave plates, right-angle prism, collimation lens and catoptron etc.
Divide according to key element (magneto-optic memory technique and polarization close/beam splitter etc.) shape, magneto-optic shutter has types such as block type, film-type and optical-fiber type.Key element major part that existing magneto-optic shutter adopts be block type, and minority adopts film-type, also discovery employing optical-fiber type.By comparison and analysis, can find to exist following shortcoming to existing magneto-optic shutter:
1) switching speed is lower.Existing magneto-optic shutter Specifeca tion speeification is, switching speed is 20 microseconds～1 millisecond, and inserting loss is 0.4～2.2 decibel, and crosstalking is 30～60 decibels, and return loss is 50～60 decibels.These magneto-optic shutters are under existing condition, and what have can also satisfy basic demand, but obviously can not satisfy the requirement of the all-optical network in the fast development.Microsecond magnitude that these Specifeca tion speeifications of magneto-optic shutter and all-optical network require and nanosecond order differ a segment distance in addition.
2) it is integrated to be difficult to array.The most of magneto-optic memory technique of block type and the polarization of block type of adopting of existing magneto-optic shutter closes/beam splitter, and volume is bigger, and the magnetic field utilization factor is not high.Simultaneously, the profile of block type structure is unfavorable for the integrated on a large scale of magneto-optic shutter.The intensive multiport input and output of this and the needed Optical Add Drop Multiplexer of all-optical network system, optical cross-connect and optical router require to differ greatly.
3) do not adopt the optical-fiber type magneto-optic memory technique.The magneto-optic shutter research approach of optical-fiber type magneto-optic memory technique does not also appear adopting both at home and abroad.
Summary of the invention
The present invention is directed to the switching speed that existing magneto-optic shutter exists lower, be difficult to shortcomings such as array is integrated, provide a kind of possess no movement parts, switching speed soon, good stability, driving voltage be low, it is little to crosstalk, volume is little and be easy to the total fiber-optical magneto-optical shutter of advantage such as highly integrated.
The present invention is provided with the input polarization beam splitter, the external incident light of its input port, and incident light is decomposed the P light and the S light of 2 polarization state quadratures of output;
2 polarization maintaining optical fibres, its input port connect the P light and the S optical output port of 2 polarization state quadratures of polarization beam apparatus respectively through the polarization maintaining optical fibre joint, 2 polarization maintaining optical fibres are selected from magneto-optic memory technique optical fiber; Said magneto-optic memory technique optical fiber can be selected from magneto-optical crystal optical fiber or magneto-optic glass optical fiber etc.;
2 yttrium iron garnets (YIG) optical fiber, YIG optical fiber places high-speed magnetic field, and the input port of YIG optical fiber connects the output port of 2 polarization maintaining optical fibres respectively;
The 2nd pair of polarization beam apparatus, its input port connects the output port of 2 YIG optical fiber respectively;
2 polarization beam combiners, its input end connect the respectively P light of 2 polarization state quadratures of the 2nd pair of polarization beam apparatus and the output port of S light respectively;
2 single-mode fibers, its input port connect the wave output terminal that closes of 2 polarization beam combiners respectively, and the output port output polarization closes glistening light of waves bundle.
High-speed magnetic field is meant that the generation time in magnetic field and regression time are all less than the magnetic field of 1 microsecond.
Magneto-optic memory technique and polarization beam combiner or polarization beam apparatus all are made into the magneto-optic shutter of optical fiber shape, are referred to as total fiber-optical magneto-optical shutter.This definition is similar to the definition of full Fibre Optical Sensor.
In total fiber-optical magneto-optical shutter, adopt magneto-optical crystal optical fiber to replace block type magneto-optical crystal as magneto-optic element.Magneto-optic memory technique optical fiber can reduce volume around multi-turn; Improve faraday's anglec of rotation, improve measuring accuracy; Reduce driving voltage, reduce power consumption.
Magneto-optic shutter mainly utilizes faraday's magnetic rotation effect.Faraday's magnetic rotation effect is called magneto-optic effect again, is meant under the effect of some material outside magnetic field, and the polarization direction of linearly polarized light by it is rotated.Utilize this characteristic, magneto-optic shutter is realized the necessary full light handoff functionality of all-optical communication network.
Utilize magneto-optic memory technique optical fiber (magneto-optical crystal optical fiber, magneto-optic glass optical fiber, or the like), the characteristic of polarization beam apparatus, polarization beam combiner, polarization maintaining optical fibre joint and high-speed magnetic field, can design 1 * 2 type total fiber-optical magneto-optical shutter, realize the necessary full light handoff functionality of optical communication.
The optical-fiber type polarization beam apparatus can output to the polarization state that a branch of light is divided into two quadratures in two polarization maintaining optical fibres; The optical-fiber type polarization beam combiner can close the light beam from two polarization maintaining optical fibres ripple to a single-mode fiber output.Magneto-optical crystal YIG can be made into the optical fiber with Faraday effect by technologies such as LHPG.Connected by the polarization maintaining optical fibre joint between the various optical fiber, and formed the small-sized magneto-optic shutter of full fiber type.Under the control of outside magnetic field, incident light will be from different output port output.
The present invention changes the turning effort of magneto-optical crystal material to the incident polarized light plane of polarization by the variation of externally-applied magnetic field, thereby reaches the effect of change and switching-over light path.Compare with existing magneto-optic shutter, advantage of the present invention is:
1) adopts optical-fiber type magneto-optic memory technique and optical-fiber type polarization to close/beam splitter, constitute light shutter device based on optical fiber.This there is no relevant report at home and abroad.
2) optical-fiber type magneto-optic memory technique and optical-fiber type polarization close/physical dimension of beam splitter is all less, make physical dimension of the present invention have largely and reduce with respect to existing magneto-optic shutter.
3) the one-piece construction flexibility is good, and is flexible, can be rolled into fiber turns, and sensitivity improves relatively, can 180 ° of comprehensive connection fibre-optical splices of solid angle, also can be used on the curved surface place.
4) structure is very thin, can integratedly expand, and can a plurality ofly be arranged in parallel or cross arrangement is integrated into bigger pliable and tough " fiber cloth ".Should " fiber cloth " can be curled into the pipe shape, also can tile and pile up, can be integrated into highdensity magneto-optic shutter cubical array on a large scale.
5) driving voltage is low.Optical fiber can be curled into fiber turns, and the magnetic field utilization factor improves relatively, and required driving voltage is low, power consumption is low, temperature stability improves relatively.
Description of drawings
Fig. 1 is the light path principle figure of 1 * 2 total fiber-optical magneto-optical shutter when the state of high-speed magnetic field is " OFF ".
Fig. 2 is the light path principle figure of 1 * 2 total fiber-optical magneto-optical shutter when the state of high-speed magnetic field is " ON ".
Fig. 3 is the synoptic diagram of polarization maintaining optical fibre (magneto-optic memory technique optical fiber) and polarization maintaining optical fibre joint.
Fig. 4 is the synoptic diagram of Y type polarization beam apparatus and polarization beam combiner.
Embodiment
In Fig. 1, be broken down into the P light and the S light of two polarization state quadratures behind the incident light process polarization beam apparatus PBS1 from input port 1, and output in two polarization maintaining optical fibres 4,5.Two polarization maintaining optical fibres 4,5 are connecting the YIG optical fiber 6,7 that places high-speed magnetic field H respectively.Two YIG optical fiber 6,7 are connecting the 2nd couple of polarization beam apparatus PBS2 and PBS3 respectively.When high-speed magnetic field H is in " OFF " state, only P light will output among the polarization beam combiner PBC1 with only S light among the polarization beam apparatus PBS3 and close ripple among the polarization beam apparatus PBS2, and from output port 2 outputs.In Fig. 2, when high-speed magnetic field H is in " ON " state, the P polarization surface of incident YIG optical fiber 6,7 will take place 90 ° and rotate and be output as S light, be output as to the S photophase of going into to hit P light, so only S light will output among the polarization beam combiner PBC2 with only P light among the polarization beam apparatus PBS3 and close ripple among the polarization beam apparatus PBS2, and from output port 3 outputs.
Polarization maintaining optical fibre (magneto-optic memory technique optical fiber) and optical fiber polarisation bundling device or polarization beam apparatus are referring to Fig. 3 and 4.In Fig. 3,2 polarization maintaining optical fibres (magneto-optic memory technique optical fiber) be labeled as 4,5, the joint of polarization maintaining optical fibre be labeled as 41,51.In Fig. 4, the left side is polarization beam apparatus PBS, and the left side is polarization beam combiner PBC.
Claims (3)
1, total fiber-optical magneto-optical shutter is characterized in that being provided with
The input polarization beam splitter, the external incident light of its input port;
2 polarization maintaining optical fibres, its input port connect the P light and the S optical output port of 2 polarization state quadratures of polarization beam apparatus respectively through the polarization maintaining optical fibre joint;
2 yttrium iron garnet optical fiber, yttrium iron garnet optical fiber places high-speed magnetic field, and the input port of yttrium iron garnet optical fiber connects the output port of 2 polarization maintaining optical fibres respectively;
The 2nd pair of polarization beam apparatus, its input port connects the output port of 2 yttrium iron garnet optical fiber respectively;
2 polarization beam combiners, its input end connect the respectively P light of 2 polarization state quadratures of the 2nd pair of polarization beam apparatus and the output port of S light respectively;
2 single-mode fibers, its input port connect the wave output terminal that closes of 2 polarization beam combiners respectively, and the output port output polarization closes glistening light of waves bundle.
2, total fiber-optical magneto-optical shutter as claimed in claim 1 is characterized in that said 2 polarization maintaining optical fibres are selected from magneto-optic memory technique optical fiber.
3, total fiber-optical magneto-optical shutter as claimed in claim 1 is characterized in that said magneto-optic memory technique optical fiber is selected from magneto-optical crystal optical fiber or magneto-optic glass optical fiber.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100745231A CN1332242C (en) | 2005-05-25 | 2005-05-25 | Total fiber-optical magneto-optical shutter |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100745231A CN1332242C (en) | 2005-05-25 | 2005-05-25 | Total fiber-optical magneto-optical shutter |
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| CN1700060A true CN1700060A (en) | 2005-11-23 |
| CN1332242C CN1332242C (en) | 2007-08-15 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970029A (en) * | 2017-03-09 | 2017-07-21 | 南开大学 | Septicemia product examine examining system |
| CN109556538A (en) * | 2018-12-28 | 2019-04-02 | 光越科技(深圳)有限公司 | Double tail collimators and polarized light beam combining device angle automatching detection system |
| CN110426027A (en) * | 2019-08-09 | 2019-11-08 | 浙江大学 | A kind of fibre optic gyroscope and its method of the realization multi-turn detour based on magneto-optic shutter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6366714B1 (en) * | 1998-06-19 | 2002-04-02 | Corning Incorporated | High reliability fiber coupled optical switch |
| JP3642517B2 (en) * | 2001-10-05 | 2005-04-27 | 国新産業株式会社 | Mobile simulation experience device |
| KR20040019922A (en) * | 2002-08-28 | 2004-03-06 | 엔이씨 도낀 가부시끼가이샤 | Optical switch |
| CN2575692Y (en) * | 2002-09-21 | 2003-09-24 | 深圳市贝光通科技有限公司 | Three-dimensional stereo-picture frisket |
| CN1540374A (en) * | 2003-10-31 | 2004-10-27 | 中国科学院上海微系统与信息技术研究 | Full optical fiber type N Chi N optical swtich and preparing method |
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2005
- 2005-05-25 CN CNB2005100745231A patent/CN1332242C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970029A (en) * | 2017-03-09 | 2017-07-21 | 南开大学 | Septicemia product examine examining system |
| CN109556538A (en) * | 2018-12-28 | 2019-04-02 | 光越科技(深圳)有限公司 | Double tail collimators and polarized light beam combining device angle automatching detection system |
| CN110426027A (en) * | 2019-08-09 | 2019-11-08 | 浙江大学 | A kind of fibre optic gyroscope and its method of the realization multi-turn detour based on magneto-optic shutter |
| CN110426027B (en) * | 2019-08-09 | 2021-04-20 | 浙江大学 | Optical fiber gyroscope for realizing multi-turn winding based on magneto-optical switch and method thereof |
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| CN1332242C (en) | 2007-08-15 |
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