CN100437215C - Reflective magneto-optical switch - Google Patents
Reflective magneto-optical switch Download PDFInfo
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- CN100437215C CN100437215C CNB2007100091142A CN200710009114A CN100437215C CN 100437215 C CN100437215 C CN 100437215C CN B2007100091142 A CNB2007100091142 A CN B2007100091142A CN 200710009114 A CN200710009114 A CN 200710009114A CN 100437215 C CN100437215 C CN 100437215C
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Abstract
Reflective type magneto-optical switch, relates to a magneto-optical switche. With three right-angle prism, polarization beam splitter and polarization rotation device; First rectangular prism input external laser, then strikes into the polarization beam splitter; polarization beam splitter output will be 2 laser beam decomposition orthogonal polarization state S-P light and the second right-angle prism external input polarization beam splitter side, will be reflected to incident light polarization rotation device; polarization rotation of the input device proximal external polarization beam splitter and the second output Right-angle prism output, and output from the left will be part of the two polarized light beam strikes into a third rectangular prism; third rectangular prism external polarization rotation of the left part of the device output, and the third in the rectangular prism Polarized light reflection to the left part of the rotating device input port, the polarization rotation device, a bouquet of polarized light to the second right-angle prism, a reflection to the polarization beam splitter merger with another a bouquet of polarized light, and in accordance with the requirements of entry output ports.
Description
Technical field
The present invention relates to a kind of magneto-optic shutter, especially relate to a kind of reflective magneto-optical switch.
Background technology
Along with the development of Fibre Optical Communication Technology and the extensive application of DWDM, the DWDM all-optical network is becoming the main developing direction of communication network.Development of Photonic Network will depend on the progress of components and parts such as photoswitch of new generation, wavelength division multiplexer, optical attenuator and image intensifer.Photoswitch is as one of core parts of all-optical network, and the quality of its performance directly affects the performance of network.Photoswitch have the device scale integrated, with optical coupling efficiency height, characteristics such as communication bandwidth is big, reliability is high and can produce in enormous quantities, become one of gordian technique of all-optical network.Photoswitch is as one of requisite Primary Component in the all-optical network, and in aspect decisive role such as OXC, OADM and protection inversions, the multiple performance of photoswitch all is the important references standard of decision OADM and OXC performance.Along with the high speed development of all-optical network, network has proposed more and more higher requirement to the performance of photoswitch, and high performance photoswitch is just attracting the notice of optical communication industry.
The exchange of traditional light exists the conversion of light-electrical-optical in exchange process, and their exchange capacity all will be subjected to the restriction of electron device operating rate, makes the bandwidth of overall optical communication system be restricted.Full light exchange can economize and deluster-exchange process of electrical-optical, make full use of the broadband character of optical communication.Full light exchange is considered to the switching technology of new generation of the tool potentiality of following broadband communication network.In desirable all-optical network, all functions such as the exchange of signal, routing, transmission and recovery are all carried out with the form of light.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 and 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, has the low and advantage such as little of crosstalking of driving voltage again with respect to other non-mechanical optical switch.It is more and more paid attention in the optical passive component field in recent years.
Magneto-optic effect is meant when linearly polarized light is propagated in magnetic medium, a kind of physical phenomenon that rotated by its plane of polarization of effect of external magnetic field.Utilize magneto-optic effect, can make direction of polarized light produce needed change, thereby make synthetic output light arrive the port of appointment.Experiment shows that the distance of the anglec of rotation of polarized light vibration plane and magnetic induction density and propagation is linear.The direction of magneto-optic memory technique optically-active and the direction of propagation of light are irrelevant, and be only relevant with the externally-applied magnetic field direction.When adding forward magnetic field on the magnetic opticity crystal, the plane of polarization of the line polarisation of process magnetic opticity crystal will be rotated in the forward; If add the reversed magnetic field on the magnetic opticity crystal, the line polarisation that then passes through the magnetic opticity crystal is with reverse rotation.Magneto-optic memory technique is general to adopt yttrium iron garnet (YIG) crystalline material pure matter, doped Ce and Bi, and it has bigger Verdet constant and less consumption at L-band.
In existing magneto-optic shutter, the components and parts that adopt have magneto-optical crystal, polarization beam apparatus, polarization beam combiner, birefringece crystal, λ/4 wave plates, right-angle prism, collimation lens and catoptron etc. usually, but have following shortcoming.
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 employing of existing magneto-optic shutter adds energization solenoid, and volume is bigger, and the magnetic field utilization factor is not high.Simultaneously, solenoid 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) light path of the present invention is simple, has reduced the quantity of components and parts and the loss of energy.
Summary of the invention
It is lower and be difficult to shortcomings such as array is integrated to the objective of the invention is to the switching speed that exists at existing magneto-optic shutter, 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 reflective magneto-optical switch of advantage such as highly integrated.
Technical scheme of the present invention is to adopt 3 right-angle prisms, by reflection of light, beam split with close the switching that light is realized light path, so be called reflective magneto-optical switch.
The present invention is provided with 3 right-angle prisms, polarization beam apparatus and polarized light rotary device.The external incident light of the input port of first right-angle prism is injected into polarization beam apparatus again; The external right-angle prism output terminal of the input port of polarization beam apparatus, and incident light is decomposed the P light and the S light of output 2 bundle polarization state quadratures; S light is defined as the polarized component parallel with light entrance face, and P light is defined as the polarized component vertical with light entrance face; One end of the external polarization beam apparatus of input port of second right-angle prism reflexes to the polarized light rotary device with incident light; The right half part of polarized light rotary device is imported the output terminal of external polarization beam apparatus and the output terminal of second right-angle prism, and from the left-half output terminal this two bundles polarized light is shone the 3rd right-angle prism; The output light of the left-half of the external polarized light rotary device of the 3rd right-angle prism, and in the 3rd right-angle prism, reflex to the input port of polarized light rotary device left-half, behind the polarized light rotary device, a branch of polarized light is to second right-angle prism, process reflexes to polarization beam apparatus and another bundle polarized light merges, and enters output port as requested.
Described polarized light rotary device is that magneto-optical crystal constitutes by 2 Faraday polarization apparatus.
In reflective magneto-optical switch, adopt brand-new reflected light to reach the beam splitting and the merging of light path, significantly reduced the quantity of accessory, reduce volume, reduce cost; Input and output port in same plane, easy of integration and control; Reduce driving voltage, reduce power consumption.
Magneto-optic shutter has mainly utilized Faraday's magneto-optic effect.Adopt this characteristic, magneto-optic shutter can be realized the necessary full light handoff functionality of all-optical communication network.Utilize magneto-optical rotator part, polarization beam apparatus and right-angle prism characteristic, can design 1 * 2 type magneto-optic shutter, realize the necessary full light handoff functionality of optical communication.
A branch of light reflexes to polarization beam apparatus through first right-angle prism, and polarization beam apparatus can output to second right-angle prism and magneto-optical rotator part to the polarization state that a branch of light is divided into two quadratures respectively; Wherein a branch of polarized light also shines the magneto-optical rotator part after through second right-angle prism.Shine the 3rd right-angle prism behind the two bundle polarized lights process magneto-optical rotator parts and reflex to the magneto-optical rotator part, a branch of polarized light directly shines polarization beam apparatus, another bundle polarized light also shines polarization beam apparatus behind second right-angle prism, two bundle polarized lights merge.The magneto-optical rotator part is made up of two magneto-optical crystals, and under the control of external electric field, incident light will be from different output port output.
The present invention is because the variation by extra electric field changes the turning effort of magneto-optical crystal material to the incident polarized light plane of polarization, changes and the effect of switching-over light path thereby reach, so compares with existing magneto-optic shutter, and the present invention has following outstanding advantage:
1) adopt reflected light path, light path principle is simple and practical.This there is no relevant report at home and abroad.
2) right-angle prism and magneto-optical rotator part physical dimension are all less, make physical dimension of the present invention have largely with respect to existing magneto-optic shutter and reduce.
3) output of the present invention and input port in one plane, the easy of integration and control of one-piece construction adopts reflection type optical path sensitivity to improve relatively.
4) device that adopts of the present invention is less, reduces cost significantly, and adopts easily and a plurality ofly be arranged in parallel or intersect the composition array of photoswitch.
5) driving voltage of the present invention is low, and magneto-optical rotator part magnetic field utilization factor is higher, 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 the embodiment of the invention (1 * 2 reflective magneto-optical switch) when the high-speed magnetic field state is " ON ".
Fig. 2 is the light path principle figure of the embodiment of the invention (1 * 2 reflective magneto-optical switch) when the high-speed magnetic field state is " OFF ".
Distribution plan when Fig. 3 is a PRE state " ON " in the embodiment of the invention magneto-optic shutter.
Distribution plan when Fig. 4 is a PRE state " OFF " in the embodiment of the invention magneto-optic shutter.
Embodiment
Shown in Fig. 1～4, a light beam incides the first right-angle prism RAP1 from the right, and injects polarization beam apparatus PBS.The polarized component parallel with light entrance face is defined as S light, and the polarized component vertical with light entrance face is defined as P light.In polarization beam apparatus PBS, the reflection of S light, the P transmittance forms two orthogonal emergent raies of plane of polarization.Utilize the second right-angle prism RAP2 and polarization beam apparatus PBS, two the parallel incident polarized light rotating element of orthogonal light PRE.S light and P light more oppositely by polarized light rotating element PRE, enter the second right-angle prism RAP2 and polarization beam apparatus PBS at last after polarized light rotating element PRE enters the 3rd right angle shuttle mirror RAP3.
When PRE was in " ON " state, two bundle polarization surface had all been rotated 90 °.Two bundle light are synthetic a branch of in polarization beam apparatus PBS, export from output port 1 through the first right-angle prism RAP1.When polarized light rotating element PRE was in " OFF " state, two bundle light all kept original polarization state.Two bundle light are synthetic a branch of in polarization beam apparatus PBS, and from output port 2 outputs.In magneto-optic shutter, input polarization state of light and duty are irrelevant.Two light paths that S light and P light are passed by are actually equal.Only need a polarized light rotating element PRE to be used to control two bundle polarization polarization state of light; A polarization beam apparatus PBS is used for the decomposition of light beam with synthetic.
In the light path layout of magneto-optic shutter, polarized light rotating element PRE is a kind of core devices.In Fig. 3 and Fig. 4, the polarized light rotating element PRE of light path is made of two Faraday polarization apparatus (magneto-optical crystal).When the energising direction of magneto-optical crystal M-O (A) and M-O (B) is opposite, a magneto-optical crystal is to 22.5 ° of the each rotations of polarized light, another magneto-optical crystal rotates-22.5 ° to polarized light at every turn, polarized light rotating element PRE is not optically active to polarized light on the whole, and light path is in pass-through state.When the energising direction of magneto-optical crystal M-O (A) and M-O (B) was identical, two magneto-optical crystals were at every turn all to 22.5 ° of polarized light rotations, and polarized light rotating element PRE is on the whole with the polarized light half-twist, and light path is in crossing condition.
Claims (2)
1. a reflective magneto-optical switch is characterized in that being provided with 3 right-angle prisms, 1 polarization beam apparatus and 1 polarized light rotary device; The external incident light of the input port of first right-angle prism is injected into polarization beam apparatus again; The external first right-angle prism output terminal of the input port of polarization beam apparatus, and incident light is decomposed the P light and the S light of output 2 bundle polarization state quadratures; S light is defined as and the parallel polarized component of the first right-angle prism light entrance face, and P light is defined as and the vertical polarized component of the first right-angle prism light entrance face; One end of the external polarization beam apparatus of input port of second right-angle prism reflexes to the polarized light rotary device with incident light; The right half part of polarized light rotary device is imported the output terminal of external polarization beam apparatus and the output terminal of second right-angle prism, and from the left-half output terminal this two bundles polarized light is shone the 3rd right-angle prism; The output light of the left-half of the external polarized light rotary device of the 3rd right-angle prism, and in the 3rd right-angle prism, reflex to the input port of polarized light rotary device left-half, behind the polarized light rotary device, a branch of polarized light is to second right-angle prism, process reflexes to polarization beam apparatus and another bundle polarized light merges, and requires to enter output port according to the switching of light signal.
2. a kind of reflective magneto-optical switch as claimed in claim 1 is characterized in that described polarized light rotary device is that magneto-optical crystal constitutes by 2 Faraday polarization apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100091142A CN100437215C (en) | 2007-06-18 | 2007-06-18 | Reflective magneto-optical switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100091142A CN100437215C (en) | 2007-06-18 | 2007-06-18 | Reflective magneto-optical switch |
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| Publication Number | Publication Date |
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| CN101071202A CN101071202A (en) | 2007-11-14 |
| CN100437215C true CN100437215C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100091142A Expired - Fee Related CN100437215C (en) | 2007-06-18 | 2007-06-18 | Reflective magneto-optical switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110456531A (en) * | 2019-08-07 | 2019-11-15 | 浙江大学 | A kind of miniature magneto-optic fiber switch |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6448023A (en) * | 1987-08-19 | 1989-02-22 | Fujitsu Ltd | Arrangement structure for magneto-optical crystal of optical switch |
| JPS6448019A (en) * | 1987-08-19 | 1989-02-22 | Fujitsu Ltd | Polarized light separating composite prism |
| US20040081392A1 (en) * | 2002-10-25 | 2004-04-29 | Shifang Li | Miniature 1x2 magneto-optic switch |
| CN1588179A (en) * | 2004-08-17 | 2005-03-02 | 厦门大学 | High speed micro magnetooptical switch device |
| CN1619361A (en) * | 2004-10-14 | 2005-05-25 | 厦门大学 | High speed mini type magnetic light switch |
-
2007
- 2007-06-18 CN CNB2007100091142A patent/CN100437215C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6448023A (en) * | 1987-08-19 | 1989-02-22 | Fujitsu Ltd | Arrangement structure for magneto-optical crystal of optical switch |
| JPS6448019A (en) * | 1987-08-19 | 1989-02-22 | Fujitsu Ltd | Polarized light separating composite prism |
| US20040081392A1 (en) * | 2002-10-25 | 2004-04-29 | Shifang Li | Miniature 1x2 magneto-optic switch |
| CN1588179A (en) * | 2004-08-17 | 2005-03-02 | 厦门大学 | High speed micro magnetooptical switch device |
| CN1619361A (en) * | 2004-10-14 | 2005-05-25 | 厦门大学 | High speed mini type magnetic light switch |
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