CN105301806B - A kind of polarization maintaining optical fibre acousto-optic photoswitch - Google Patents
A kind of polarization maintaining optical fibre acousto-optic photoswitch Download PDFInfo
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- CN105301806B CN105301806B CN201510816697.4A CN201510816697A CN105301806B CN 105301806 B CN105301806 B CN 105301806B CN 201510816697 A CN201510816697 A CN 201510816697A CN 105301806 B CN105301806 B CN 105301806B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/125—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves in an optical waveguide structure
Abstract
The invention discloses a kind of polarization maintaining optical fibre acousto-optic photoswitch, including housing, in housing, input is provided with an input collimator, outfan is provided with n outfan collimator, it is provided with an acousto-optical device between input collimator and n outfan collimator, described input collimator is connected with input polarization maintaining optical fibre, and each outfan collimator is connected with an output polarization maintaining optical fibre respectively；After input collimator enters acousto-optic medium, there is unusual acoustic optic interaction with the ultrasonic shear waves of n frequency in acousto-optic medium in incident illumination, forms n road diffraction light, and enter after outfan collimator respectively in output polarization maintaining optical fibre.Polarization extinction ratio of the present invention is high, and light beam signal can be distributed to two or more light path simultaneously.
Description
Technical field
The present invention relates to a kind of optics, belong to acoustooptic technique field, particularly relate to a kind of polarization maintaining optical fibre acousto-optic photoswitch.
Background technology
In recent years, the optical coherence detection based on line polarized light obtains tremendous development, and coherent detection is greatly improvedSignal to noise ratioAnd measurementPrecision, it is applied widely in the optical fiber telecommunications systems such as the sensor such as optical fibre gyro, fibre optic hydrophone and DWDM, EDFA.In such applications, it is frequently necessary to use high speed, High Extinction Ratio, long-life without moving parts and the acousto-optic photoswitch of high power laser light can be born, but current optical fiber acousto-optic photoswitch is all to use compressional wave to make, it is impossible to polarization state is optimized process, reduces coherent detectionSignal to noise ratioAnd measurementPrecision.Simultaneously, polarization maintaining optical fibre is in pulling process, owing to the fault of construction of inside of optical fibre generation can cause the decline of guarantor's bias energy, i.e. when line polarized light is along a feature axis transmission of optical fiber, part optical signals can be coupled into the feature axis that another is normal thereto, the polarization extinction ratio ultimately causing optical signal deteriorates, it is therefore desirable to takes unit's piece optimization polarization extinction ratios such as analyzer in the optical path, which increases the complexity of light path.
During carrying out optical information processing, in order to obtain more metrical information, it is frequently necessary to be distributed in two or more light path light beam signal simultaneously, current optical fiber acousto-optic photoswitch (public announcement of a patent application CN 104297952) needs two or more acousto-optical device to realize, structure is complicated, relatively costly, and the polarization extinction ratio deteriorated can not be optimized.
It addition, current optical fiber acousto-optic photoswitch leads to the Single wavelength " V " shape anti-reflection film that bright finish is both for using wavelength to be coated with, limit the range of optical fiber acousto-optic photoswitch.
Summary of the invention
For deficiencies of the prior art, it is an object of the invention to solve existing fiber acousto-optic photoswitch polarization extinction ratio and light beam signal cannot be distributed to two or more light path problem simultaneously, it is provided that a kind of polarization maintaining optical fibre acousto-optic photoswitch being applicable to wide spectral laser.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is such that a kind of polarization maintaining optical fibre acousto-optic photoswitch, and including housing, in housing, input is provided with an input collimator, and outfan is provided with n outfan collimator, wherein, n >=1；It is provided with an acousto-optical device between input collimator and n outfan collimator, described acousto-optical device includes acousto-optic medium, piezoelectric transducer, matching network and high-frequency socket, it is characterized in that: described input collimator is connected with input polarization maintaining optical fibre, each outfan collimator is connected with an output polarization maintaining optical fibre respectively；Described acousto-optic medium is tellurium oxide crystal, and the transductive material of described piezoelectric transducer is that the X that can produce shearing wave cuts Lithium metaniobate, and wherein, the angle between the direction, logical sound face of acousto-optic medium [110] axle and piezoelectric transducer is θ；
N the high-frequency signal inputted by high-frequency socket, inputs piezoelectric transducer after matched network, n high-frequency signal is converted into n shearing wave by piezoelectric transducer, and the welded layer of described shearing wave forms the ultrasonic shear waves of n frequency after being input to acousto-optic medium；Incident illumination is after input collimator enters acousto-optic medium, unusual acoustic optic interaction is there is with the ultrasonic shear waves of n frequency in acousto-optic medium, forming n road diffraction light, n road diffraction light is line polarized light, and enters after outfan collimator respectively in output polarization maintaining optical fibre.
Further, two logical bright finish of described acousto-optic medium have all been coated with the number of plies is at least 4 layer dielectrics.
Further, described deielectric-coating is the wide spectrum anti-reflection film that can reduce luminous reflectance, and this wide spectrum anti-reflection film reflectance in wavelength 1 μm to 1.6 μ m is less than 2%.
Further, the deielectric-coating number of plies that the logical bright finish of described acousto-optic medium is coated with is 8 layers, and wherein, described deielectric-coating includes zirconium oxide film and silicon oxide film, and zirconium oxide film and silicon oxide film are alternately distributed.
Further, the direction, logical sound face of piezoelectric transducer and the angle theta of acousto-optic medium ［ 110 ］ axle are 6 ± 1 °.
Further, between n high-frequency signal, frequency phase-difference is not less than 20MHz.
Compared with prior art, present invention have the advantage that
1, polarization extinction ratio is optimized；Theoretical according to unusual acoustic optic interaction, the output of polarization maintaining optical fibre acousto-optic photoswitch is all line polarized light.Linear polarization flashlight can deteriorate through polarization maintaining optical fibre long range propagation rear polarizer extinction ratio, but no matter polarization extinction ratio has many deteriorations, can obtain line polarized light, i.e. polarization extinction ratio and be optimized after polarization maintaining optical fibre acousto-optic photoswitch, and need not extra analyzer, simplify light path design.
2, an acousto-optical device has only been used to achieve a road input n road output, it is simple to the analyzing and processing of optical signal.
3, the light intensity of the n road diffraction light of output is controlled (minimum can be 0), can export on a road, can export with two-way, it is also possible to n road exports simultaneously simultaneously, can also quickly be adjusted the intensity of diffraction light by electrical power, the light intensity for each road of reasonable distribution outfan creates condition.
4, two logical bright finish of acousto-optic medium have all been coated with the wide spectrum anti-reflection film reducing luminous reflectance no less than 4 layers, this wide spectrum anti-reflection film reflectance in wavelength 1 μm to 1.6 μ m is less than 2%, make polarization maintaining optical fibre acousto-optic photoswitch go for wider spectral region, improve product versatility.
Accompanying drawing explanation
Fig. 1-l × 2 of the present invention optical fiber acousto-optic optical switch construction schematic diagram.
Fig. 2-l × 3 of the present invention optical fiber acousto-optic optical switch construction schematic diagram.
Fig. 3-optical fiber acousto-optic photoswitch acousto-optic medium of the present invention leads to light face width spectrum anti-reflection film structural representation.
In figure: 1 housing, 2 input collimators, 3 outfan collimators, 31 first outfan collimators, 32 second outfan collimators, 33 the 3rd outfan collimators, 4 acousto-optical devices, 41 acousto-optic mediums, 42 piezoelectric transducers, 43 matching networks, 44 high-frequency sockets, 5 input polarization maintaining optical fibres, 6 output polarization maintaining optical fibres, 7 incident illuminations, 8 diffraction lights, 81 first diffraction lights, 82 second diffraction lights, 83 the 3rd diffraction lights, X leads to direction, sound face, ［ 110 ］ ［ 110 ］ axle.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment: a kind of polarization maintaining optical fibre acousto-optic photoswitch, including housing 1, input is provided with an input collimator 2 in housing 1, and outfan is provided with n outfan collimator 3, wherein, n >=1.Being provided with an acousto-optical device 4 between input collimator 2 and n outfan collimator 3, described acousto-optical device 4 includes acousto-optic medium 41, piezoelectric transducer 42, matching network 43 and high-frequency socket 44.Described input collimator 2 is connected with input polarization maintaining optical fibre 5, and each outfan collimator 3 is connected with an output polarization maintaining optical fibre 6, to ensure the polarization extinction ratio of output signal respectively.Described acousto-optic medium 41 is tellurium oxide crystal, the transductive material of described piezoelectric transducer 42 is that the X that can produce shearing wave cuts Lithium metaniobate, wherein, the logical sound face direction X(of acousto-optic medium 41 [110] axle (axial) and piezoelectric transducer 42 is i.e. perpendicular to the direction in logical sound face) between angle be θ, this angle theta size is 6 ± 1 °.
The bandwidth that angle theta works with acousto-optical device 4 is relevant；Angle theta is the biggest, mid frequency and the bandwidth of acousto-optical device 4 work are the biggest, i.e. incident illumination 7 is the widest with the frequency range of ultrasonic shear waves generation acoustic optic interaction, more outfan interface can be made, but at this moment the operating frequency of ultrasonic shear waves is higher, decay is relatively big (decay of ultrasonic shear waves and operating frequency square be directly proportional), the intensity of diffraction light 8 is relatively low, and the Insertion Loss of optical fiber acousto-optic photoswitch is higher；Otherwise, angle theta is the least, mid frequency and the bandwidth of acousto-optical device 4 work are the least, i.e. incident illumination 7 is the narrowest with the frequency range of ultrasonic shear waves generation acoustic optic interaction, less outfan interface can only be made, but at this moment the operating frequency of ultrasonic shear waves is relatively low, decay is less, and the intensity of diffraction light 8 is higher, and the Insertion Loss of optical fiber acousto-optic photoswitch is relatively low.Therefore, optimal angle theta to be determined according to service condition.
For l × 2 or l × 3 optical fiber acousto-optic photoswitch, acousto-optic medium 41 ［ 110 ］ axle is 6 ° (error control is in the range of 1 °) with the optimum of the angle theta of logical sound face direction X, and the bandwidth range of at this moment acousto-optical device 4 work is 40MHz--80MHz.When needs increase output port quantity, can suitably strengthen the angle theta of acousto-optic medium 41 ［ 110 ］ axle and logical sound face direction X, at this moment mid frequency and the bandwidth of acousto-optical device 4 will and then increase, as bandwidth is increased to 100MHz, the frequency interval of output signal still presses 20MHz design, at this moment output port can increase to 6, but at this moment the intensity of diffraction light 8 is relatively low, the Insertion Loss of optical fiber acousto-optic photoswitch is higher.
N the high-frequency signal inputted by high-frequency socket 44, matched network 43 inputs piezoelectric transducer 42, and wherein, between n high-frequency signal, frequency phase-difference is not less than 20MHz.N high-frequency signal is converted into n shearing wave by piezoelectric transducer 42, and the welded layer of described shearing wave forms the ultrasonic shear waves of n frequency after being input to acousto-optic medium 41.Incident illumination 7 is after input collimator 2 enters acousto-optic medium 41, unusual acoustic optic interaction is there is with the ultrasonic shear waves of n frequency in acousto-optic medium 41, form n road diffraction light 8, this n road diffraction light 8 is line polarized light (this is to be determined) by the principle of unusual acoustic optic interaction, and is entered in output optical fibre by outfan collimator 3 respectively.
Two logical bright finish of described acousto-optic medium 41 are all coated with the deielectric-coating that the number of plies is at least 4 layers, and described deielectric-coating is the wide spectrum anti-reflection film that can reduce luminous reflectance, and this wide spectrum anti-reflection film reflectance in wavelength 1 μm to 1.6 μ m is less than 2%；The number of plies of wide spectrum anti-reflection film is the most, and spectral width is the biggest, and reflectance is the lowest；Otherwise, the number of plies of wide spectrum anti-reflection film is the fewest, spectral width is the least, reflectance is the highest, therefore situation must must be made according to technique by wide spectrum anti-reflection film, the characteristic of coating materials, spectral region, reflectance etc. design optimal coating materials thickness and the number of plies, such as the wide spectrum anti-reflection film of wavelength 1 micron to 1.6 micrometer ranges, require that its reflectance is less than 2%, the deielectric-coating number of plies that the logical bright finish of described acousto-optic medium 41 is coated with is 8 layers, wherein, described deielectric-coating includes zirconium oxide film and silicon oxide film, and zirconium oxide film and silicon oxide film are alternately distributed: see Fig. 3, when being embodied as, from the coating materials number of the logical bright finish of contact, 1st layer is zirconium oxide film, thickness is 50nm；2nd layer is silicon oxide film, and thickness is 70nm；3rd layer is zirconium oxide film, and thickness is 120nm；4th layer is silicon oxide film, and thickness is 120nm；5th layer is zirconium oxide film, and thickness is 115nm；6th layer is silicon oxide film, and thickness is 100nm；7th layer is zirconium oxide film, and thickness is 115nm；8th layer is silicon oxide film, and thickness is 85nm.
As a kind of embodiment, seeing Fig. 1, described outfan collimator 3 is the two: first outfan collimator and the second outfan collimator.
As another embodiment, seeing Fig. 2, described outfan collimator 3 is the three: first outfan collimator 31 and the second outfan collimator 32, and the 3rd outfan collimator 32.
When being embodied as, angle theta takes 6 degree, and the transductive material thickness of piezoelectric transducer 42 is 40 μm, and the mid frequency of at this moment piezoelectric transducer 42 work is 60MHz, and its bandwidth of operation is 40MHz, and frequency range is 40MHz--80MHz.Input three high-frequency signal f1(40MHz from high-frequency socket 446), f2(60MHz) and f3(80MHz), these three frequency differs each other not less than 20MHz.The matched network of these three frequency signal 43 inputs the table electrode of piezoelectric transducer 42, these three frequency signal is converted into shearing wave by piezoelectric transducer 42 again, these shearing waves are transferred in acousto-optic medium 41 through the weld layer of piezoelectric transducer 42, form the ultrasonic shear waves of three frequencies (frequency is f1, f2 and f3) in acousto-optic medium 41.
There is unusual acoustic optic interaction in incident illumination 7 and the ultrasonic shear waves (frequency is f1, f2 and f3) in acousto-optic medium 41, and then produce diffraction light 8: the first diffraction light the 81, second diffraction light 82 and the 3rd diffraction light 83 of three linear polarization state simultaneously.First diffraction light 81 exports from polarization maintaining optical fibre after the first outfan collimator 31, second diffraction light 82 exports from polarization maintaining optical fibre after the second outfan collimator 32,3rd diffraction light 83 exports from polarization maintaining optical fibre after the 3rd outfan collimator 33, and the optical signal obtained from these three polarization maintaining optical fibres has higher polarization extinction ratio (25dB).
Finally it should be noted that, above example is only in order to illustrate technical scheme rather than restriction technologies scheme, it will be understood by those within the art that, technical scheme is modified or equivalent by those, without deviating from objective and the scope of the technical program, all should contain in the middle of scope of the presently claimed invention.
Claims (6)
1. a polarization maintaining optical fibre acousto-optic photoswitch, including housing, in housing, input is provided with an input collimator, and outfan is provided with n outfan collimator, wherein, n >=1；It is provided with an acousto-optical device between input collimator and n outfan collimator, described acousto-optical device includes acousto-optic medium, piezoelectric transducer, matching network and high-frequency socket, described input collimator is connected with input polarization maintaining optical fibre, and each outfan collimator is connected with an output polarization maintaining optical fibre respectively；Described acousto-optic medium is tellurium oxide crystal；It is characterized in that: the transductive material of described piezoelectric transducer is that the X that can produce shearing wave cuts Lithium metaniobate, wherein, the angle between the direction, logical sound face of acousto-optic medium [110] axle and piezoelectric transducer is θ；
N the high-frequency signal inputted by high-frequency socket, inputs piezoelectric transducer after matched network, n high-frequency signal is converted into n shearing wave by piezoelectric transducer, and the welded layer of described shearing wave forms the ultrasonic shear waves of n frequency after being input to acousto-optic medium；Incident illumination is after input collimator enters acousto-optic medium, unusual acoustic optic interaction is there is with the ultrasonic shear waves of n frequency in acousto-optic medium, forming n road diffraction light, n road diffraction light is line polarized light, and enters after outfan collimator respectively in output polarization maintaining optical fibre.
A kind of polarization maintaining optical fibre acousto-optic photoswitch the most according to claim 1, it is characterised in that: it is at least 4 layer dielectrics that two logical bright finish of described acousto-optic medium have all been coated with the number of plies.
A kind of polarization maintaining optical fibre acousto-optic photoswitch the most according to claim 2, it is characterised in that: described deielectric-coating is the wide spectrum anti-reflection film that can reduce luminous reflectance, and this wide spectrum anti-reflection film reflectance in wavelength 1 μm to 1.6 μ m is less than 2%.
A kind of polarization maintaining optical fibre acousto-optic photoswitch the most according to claim 3, it is characterized in that: the deielectric-coating number of plies that the logical bright finish of described acousto-optic medium is coated with is 8 layers, wherein, described deielectric-coating includes zirconium oxide film and silicon oxide film, and zirconium oxide film and silicon oxide film are alternately distributed.
A kind of polarization maintaining optical fibre acousto-optic photoswitch the most according to claim 1, it is characterised in that: the direction, logical sound face of piezoelectric transducer and the angle theta of acousto-optic medium ［ 110 ］ axle are 6 ± 1 °.
A kind of polarization maintaining optical fibre acousto-optic photoswitch the most according to claim 1, it is characterised in that: between n high-frequency signal, frequency phase-difference is not less than 20MHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105629524A (en) * | 2016-03-25 | 2016-06-01 | 福州腾景光电科技有限公司 | Array acoustic optical modulator and manufacturing method thereof |
| CN108132549A (en) * | 2018-01-30 | 2018-06-08 | 中国电子科技集团公司第二十六研究所 | It is a kind of to polarize unrelated optical fiber acousto-optic filter and its assembly method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62246017A (en) * | 1986-04-18 | 1987-10-27 | Nec Corp | Acoustooptic switch |
| JPS63307434A (en) * | 1987-06-10 | 1988-12-15 | Nec Corp | Acoustooptic switch |
| JPH02253238A (en) * | 1989-03-28 | 1990-10-12 | Asahi Glass Co Ltd | Acousto optical switch |
| CN104297952A (en) * | 2014-10-23 | 2015-01-21 | 中国电子科技集团公司第二十六研究所 | Acousto optic fiber optical switch |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020102064A1 (en) * | 2000-06-08 | 2002-08-01 | Rosemeier Jolanta I. | High speed optical intelligent switch |
| CN102662255B (en) * | 2012-05-22 | 2014-11-12 | 中国电子科技集团公司第二十六研究所 | Optical fiber acousto-optic frequency shift method and device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62246017A (en) * | 1986-04-18 | 1987-10-27 | Nec Corp | Acoustooptic switch |
| JPS63307434A (en) * | 1987-06-10 | 1988-12-15 | Nec Corp | Acoustooptic switch |
| JPH02253238A (en) * | 1989-03-28 | 1990-10-12 | Asahi Glass Co Ltd | Acousto optical switch |
| CN104297952A (en) * | 2014-10-23 | 2015-01-21 | 中国电子科技集团公司第二十六研究所 | Acousto optic fiber optical switch |
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