CN1588179A - High speed micro magnetooptical switch device - Google Patents
High speed micro magnetooptical switch device Download PDFInfo
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- CN1588179A CN1588179A CN 200410056177 CN200410056177A CN1588179A CN 1588179 A CN1588179 A CN 1588179A CN 200410056177 CN200410056177 CN 200410056177 CN 200410056177 A CN200410056177 A CN 200410056177A CN 1588179 A CN1588179 A CN 1588179A
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Abstract
The invention is a high speed microtype magneto-optical switching device, relating to an optical switch, especially a high speed microtype magneto-optical switch mainly used in the full-optical communication networks. It is provided with an input device, which are provided with 1 optical fiber and a self-focusing lens; the input light beam passes through the first birefringent crystal, a Faraday rotator, a quartz rotator, the second birefringent crystal, a polarizing beam splitting mirror and a total reflection prism and then is emitted. The input end of a driving device is connected with the control signal, and the output end of the driving device connected with the Faraday rotator. The invention has the advantages of low polarization sensitivity, no moving pieces, low insertion losses, fast response, low interference, small bulk, high integration degree, etc. It can meet the requirements on strong anti-interference ability, low driving voltage, high stability, simple circuit design, reliability, long-time continuously working, etc. it can be applied both to optical-cross connectors for optical communication and to various light-path monitoring and maintaining systems, data networks, optical-fiber sensor systems, optical-fiber measuring systems, etc.
Description
Technical field
The present invention relates to a kind of photoswitch, especially a kind of high speed mini type magnetic light switch that is mainly used in all-optical communication network.
Background technology
Photoswitch is the key factor that makes up the core devices and the decision network performance of large-scale optical switching system.Compare with electric switch, photoswitch has saved electrical-optical, light-electric transfer process, and the corresponding simplification of equipment greatly improves the reliability of network, and signal route platform flexibly is provided.Although adopt the photoelectricity exchange at present in the communication system, following optical-fiber network needs pure photoswitch to replace opto-electronic conversion to finish the signal routing function, realizes the two-forty of network and the transparency of agreement.Therefore photoswitch and microminiaturized status and importance thereof show especially day by day.Photoswitch is as a kind of optical device, and the application in optical communication field is very extensive.It can be integrated in the various Optical NE, for example automatic-protecting switching device, network monitoring system, component testing system, Optical Add Drop Multiplexer system, optical cross-connect, optical router, fiber optic sensor system and optical fiber testing system etc.
Existing photoswitch can be divided into mechanical type and on-mechanical formula two big classes substantially.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 of switch is big, and also existence rebound shake that has and repeatability are relatively poor.Non-mechanical optical switch is to utilize effects such as the electric light of material, acousto-optic, hot light and magneto-optic to develop, and with respect to mechanical optical switch, they have higher switching speed, generally can reach microsecond level even lower magnitude; It can adopt microelectronic technique integrated to realize high density, can be applied to following integrated light exchange and photoelectron exchange system.Weak point is that the insertion loss is big, isolation is low.Present stage comparatively the on-mechanical photoswitch in forward position integrated waveguide photoswitch, mems optical switch, liquid crystal optical switch, thermo-optic effect photoswitch, acoustooptic switch and minisize magneto-optical shutter etc. are arranged.Yang Jun etc. have reported a kind of theoretical analysis and magnetic Circuit Design (photoelectron technology and information, 2002,5) of novel magneto-optic shutter, and lock has been stated the principle of magneto-optical crystal optically-active and the optical property of magneto-optical crystal, and magnetic circuit is designed and calculates.Zhang Huiying etc. have reported a kind of novel fiber-optic switch (semiconductor optoelectronic, 2001,1), have inquired into the characteristics of light polarization phenomenon and optical rotation phenomenon, and then utilize polarization and optical rotation phenomenon to propose a kind of novel fiber-optic switch.
Summary of the invention
For the light-electricity that overcomes existing photoswitch and the low speed transmissions mode of electrical-optical conversion regime and mechanical optical switch, the present invention is intended to propose a kind of all-optical communication network that is used for, and can switch the novel high speed minisize magneto-optical shutter device of full optical information at high speed with high capacity ground.
The present invention is provided with
Input media, said input media are provided with 1 optical fiber and GRIN Lens, and GRIN Lens is located on the optical fiber outgoing beam light path;
Optical path switching device, comprise 2 birefringece crystals, Faraday rotator, quartzy spinner, polarizing beam splitter mirror and total reflection triangular prism, the 1st birefringece crystal is located on the input media outgoing beam light path, Faraday rotator is located on 2 linearly polarized light outgoing beam light paths of the 1st birefringece crystal, and quartzy spinner is located on 2 linearly polarized light emitting light paths of Faraday rotator, the 2nd birefringece crystal is located on the light path of 2 linearly polarized lights of quartzy spinner outgoing, and polarizing beam splitter mirror and total reflection triangular prism are located at respectively on the ejaculation light path of 2 bundle polarizations rotation light of the 2nd birefringece crystal;
Output unit, said output unit are provided with 2 optical fiber and GRIN Lens, and the GRIN Lens of output unit is located on the ejaculation light path of optical path switching device, and optical fiber is located on the emitting light path of GRIN Lens of output unit;
Drive unit, the external control signal port of its signal input end, the Faraday rotator of drive unit output termination optical path switching device.
Birefringece crystal can adopt YVO
4(vanadic acid yttrium) crystal.
Faraday rotator can be made up of magneto-optical crystal and energization solenoid, and magneto-optical crystal is fixed on the energization solenoid, and magneto-optical crystal can adopt Gd:YIG to mix 45 ° of magneto-optical crystals that gadolinium yttrium iron garnet thick film constitutes.Preferably adopt two energization solenoids, magneto-optical crystal is fixed between two energization solenoids.Quartzy spinner also can adopt 45 ° of wave plates, i.e. λ/4 wave plates.Drive unit can adopt the nanosecond order pulse producer, and under the effect of drive unit, a light beams of input optical switch can be as requested from different optic path, and outputs to a specific photoswitch output port in the two.
The optical communication photoswitch is one of crucial passive device in the optical communication technique.In recent years, the photoswitch progress is rapid, and its content relates to version, principle, use wavelength and the polarization-sensitivity etc. of photoswitch.With regard to optical communication technique to regard to the request for utilization of photoswitch, it must have low crosstalk, little insertion loss, short switching time and low polarization sensitivity, simultaneously also there is specific requirement aspects such as extinction ratio, switch scale, switch size.With regard to the factor that influences the photoswitch parameter,, the height of assembling and adjustment technology level etc. is arranged also by the quality of forming each discrete device technical indicator (as transmissivity, angle of rotation etc.) of photoswitch.
The high-speed control technology research that the present invention has provided the optical beam path design of high speed mini type magnetic light switch and high speed mini type magnetic light switch comprises the research of nanosecond pulse signal generator and control technology thereof.For switching time of guaranteeing minisize magneto-optical shutter less than performance parameter value, must adopt high-speed control technology.The high-speed control technology of minisize magneto-optical shutter has bigger influence to switching speed and other performance of minisize magneto-optical shutter.The length of switching time is an important performance characteristic of minisize magneto-optical shutter.The requirement of its circuit that relates to satisfied antijamming capability is strong, driving voltage is low, stability is high, circuit design is simple, reliable, continuous working for a long time.
Experimental result shows that the present invention has low, the no moving parts of polarization sensitivity, the insertion loss is little, response speed is fast, integrated degree advantages of higher.The present invention adopts nanosecond to adjust control Driver Circuit, can satisfy that antijamming capability is strong, driving voltage is low, stability is high, circuit design simply, reliably, but requirements such as long time continuous working.The invention has the beneficial effects as follows, minisize magneto-optical shutter combines Faraday magnetooptical effect, Micrometer-Nanometer Processing Technology, high-velocity electrons control technology, make minisize magneto-optical shutter possess that no movement parts, switching speed are fast, stability is high, driving voltage is low, it is little to crosstalk, volume is little and be easy to advantages such as highly integrated, and reached following performance: insert loss and be lower than-30 decibels, switching time less than 1.5 decibels, cross-talk and be shorter than 15 microseconds, minimum voltage less than 4.5 volts.The present invention both can be applicable to the optical cross-connect of optical communication, can be applied to various light path monitoring and maintenance system, data network, fiber optic sensor system and optical fiber measurement system etc. again.
Description of drawings
Fig. 1 is a composition frame chart of the present invention.
Fig. 2 is 1 * 2 a dextrorotation magnetic field light path principle synoptic diagram of the present invention.
Fig. 3 is of the present invention 1 * 2 left-handed magnetic field light path principle synoptic diagram.
Fig. 4 is the input media synoptic diagram of the embodiment of the invention.
Fig. 5 is the output unit synoptic diagram of the embodiment of the invention.
Fig. 6 is the optical path switching device synoptic diagram of the embodiment of the invention.
Fig. 7 adopts the Faraday rotator synoptic diagram of single solenoid for the embodiment of the invention.
Fig. 8 adopts the Faraday rotator synoptic diagram of double solenoid for the embodiment of the invention.
Fig. 9 is that the millimicrosecond pulse generator circuit of the embodiment of the invention is formed schematic diagram.
Embodiment
Following examples will the present invention is further illustrated in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of high speed mini type magnetic light switch device that is used for all-optical communication network comprises input media 1, optical path switching device 2, drive unit 3 and output unit 4.Referring to Fig. 2～6, input media is provided with 1 optical fiber 11 and GRIN Lens P1, and GRIN Lens P1 is located on the optical fiber 11 outgoing beam light paths; Output unit is provided with 2 optical fiber 41,42 and GRIN Lens P2, and the GRIN Lens P2 of output unit is located on the ejaculation light path of optical path switching device, and optical fiber 41,42 is located on the emitting light path of GRIN Lens P2 of output unit.
Optical path switching device comprises 2 birefringece crystal A1 and A2, Faraday rotator F, quartzy spinner B, polarizing beam splitter mirror C and total reflection triangular prism D.The 1st birefringece crystal A1 is located on the GRIN Lens P1 outgoing beam light path of input media, Faraday rotator F is located on 2 linearly polarized light outgoing beam light paths of the 1st birefringece crystal A1, and quartzy spinner B is located on 2 linearly polarized light emitting light paths of Faraday rotator F.The 2nd birefringece crystal A2 is located on the light path of 2 linearly polarized lights of quartzy spinner B outgoing, and polarizing beam splitter mirror C and total reflection triangular prism D are located at respectively on the ejaculation light path of 2 bundle polarizations rotation light of the 2nd birefringece crystal A2.45 ° of Faraday rotators that Faraday rotator adopts the Gd:YIG thick film to constitute, Faraday rotator is made up of magneto-optical crystal M and energization solenoid S, magneto-optical crystal M is fixed on energization solenoid S and goes up (referring to Fig. 7), preferably adopt two energization solenoids, magneto-optical crystal M is fixed between two energization solenoid S1 and the S2 (referring to Fig. 8).It is λ/4 wave plates that quartzy spinner can adopt 45 ° of wave plates.
In Fig. 2, optical fiber beam 11 is sent to optical fiber 41 through photoswitch.Two part light paths of transmission optical routing of 41 are formed from optical fiber 11 to optical fiber.Light beam 11 becomes parallel light pencil, incident birefringece crystal A1 through lens P1.In birefringece crystal A1, light beam is decomposed into the two-lines polarized light, and wherein one is M light, and another is a N light.When applying the magnetic field of dextrorotation on Faraday rotator, Faraday rotator F and quartzy spinner B are respectively-45 ° and+45 ° to the rotation of light beam polarization face, so the two-lines light beam all is zero by the total polarization rotation angle after F and the B.At last, M light and the N light synthetic a branch of smooth scioptics P2 in birefringece crystal A2 by the B outgoing enters optical fiber 41.
In Fig. 3, optical fiber beam 11 is sent to optical fiber 42 through photoswitch.Two part light paths of transmission optical routing of 42 are formed from optical fiber 11 to optical fiber.Light beam 11 becomes parallel light pencil, incident birefringece crystal A1 through lens P1.In birefringece crystal A1, light beam is decomposed into the two-lines polarized light, and wherein one is M light, and another is a N light.When on Faraday rotator, applying left-handed magnetic field, Faraday rotator F and quartzy spinner B to the rotation of light beam polarization face be+45 °, so the two-lines light beam all is+90 ° by the total polarization rotation angle after F and the B.M light and N light by the B outgoing have separated in birefringece crystal A2, and M light beam originally is converted into the N light beam, and N light beam originally is converted into the M light beam, respectively output.A branch of light outputs to polarization spectroscope C through triangular prism D, and another bundle light directly outputs to polarization spectroscope C.At last, a branch of smooth scioptics P2 of this two bundle light compositing enters optical fiber 42.
The external control signal port of the signal input end of drive unit, the Faraday rotator of drive unit output termination optical path switching device.Drive unit adopts the nanosecond order pulse producer, and under the effect of drive unit, a light beams of input optical switch can be as requested from different optic path, and outputs to a specific photoswitch output port in the two.
Referring to Fig. 9, the control signal of nanosecond order pulse producer is imported by V1, and by output port OUTPUT1 and OUTPUT2 output, wherein output port OUTPUT1 exports undersuing, and output port OUTPUT2 exports positive pulse signal.Cable DELAY can change the width of output pulse.
In Fig. 9, the model and the parameter of each main components and parts are as follows:
Triode T1:2N5551 type, the T2:2N5551 type;
Diode D1:MMBD4148 type;
Resistance R 1, R2:100 Ω, R3:47 Ω, R4, R5:10K, R6:75 Ω, R7:5.1K;
Capacitor C 1:100PF, C2, C3:10PF;
Potentiometer W1:1K_LIN;
Power supply VCC:110V.
Claims (7)
1, high speed mini type magnetic light switch device is characterized in that being provided with
Input media, said input media are provided with 1 optical fiber and GRIN Lens, and GRIN Lens is located on the optical fiber outgoing beam light path;
Optical path switching device, comprise 2 birefringece crystals, Faraday rotator, quartzy spinner, polarizing beam splitter mirror and total reflection triangular prism, the 1st birefringece crystal is located on the input media outgoing beam light path, Faraday rotator is located on 2 linearly polarized light outgoing beam light paths of the 1st birefringece crystal, quartzy spinner is located on 2 linearly polarized light emitting light paths of Faraday rotator, the 2nd birefringece crystal is located on the light path of 2 linearly polarized lights of quartzy spinner outgoing, and polarizing beam splitter mirror and total reflection triangular prism are located at respectively on the ejaculation light path of 2 bundle polarizations rotation light of the 2nd birefringece crystal;
Output unit, said output unit are provided with 2 optical fiber and GRIN Lens, and the GRIN Lens of output unit is located on the ejaculation light path of optical path switching device, and optical fiber is located on the emitting light path of GRIN Lens of output unit;
Drive unit, the external control signal port of its signal input end, the Faraday rotator of drive unit output termination optical path switching device.
2, high speed mini type magnetic light switch device as claimed in claim 1 is characterized in that birefringece crystal adopts yttrium vanadate crystal.
3, high speed mini type magnetic light switch device as claimed in claim 1 is characterized in that Faraday rotator is provided with magneto-optical crystal and energization solenoid, and magneto-optical crystal is fixed on the energization solenoid.
4, high speed mini type magnetic light switch device as claimed in claim 1 is characterized in that magneto-optical crystal adopts 45 ° of magneto-optical crystals mixing gadolinium yttrium iron garnet thick film formation.
5, high speed mini type magnetic light switch device as claimed in claim 4 is characterized in that Faraday rotator is made up of magneto-optical crystal and two energization solenoids, and magneto-optical crystal is fixed between two energization solenoids.
6, high speed mini type magnetic light switch device as claimed in claim 1 is characterized in that it is λ/4 wave plates that quartzy spinner adopts 45 ° of wave plates.
7, high speed mini type magnetic light switch device as claimed in claim 1 is characterized in that drive unit adopts the nanosecond order pulse producer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410056177 CN1588179A (en) | 2004-08-17 | 2004-08-17 | High speed micro magnetooptical switch device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410056177 CN1588179A (en) | 2004-08-17 | 2004-08-17 | High speed micro magnetooptical switch device |
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| CN1588179A true CN1588179A (en) | 2005-03-02 |
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|---|---|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437215C (en) * | 2007-06-18 | 2008-11-26 | 厦门大学 | Reflective magneto-optical switch |
| WO2012027906A1 (en) * | 2010-09-03 | 2012-03-08 | 青岛海信信芯科技有限公司 | Optical rotator and laser speckle suppression divece and method based on the same |
-
2004
- 2004-08-17 CN CN 200410056177 patent/CN1588179A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437215C (en) * | 2007-06-18 | 2008-11-26 | 厦门大学 | Reflective magneto-optical switch |
| WO2012027906A1 (en) * | 2010-09-03 | 2012-03-08 | 青岛海信信芯科技有限公司 | Optical rotator and laser speckle suppression divece and method based on the same |
| CN103052899A (en) * | 2010-09-03 | 2013-04-17 | 青岛海信电器股份有限公司 | Optical rotator and laser speckle suppression divece and method based on the same |
| CN103052899B (en) * | 2010-09-03 | 2015-02-04 | 青岛海信电器股份有限公司 | Optical rotator and laser speckle suppression divece and method based on the same |
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