CN105301806A - Polarization-preserving fiber acousto-optic switch - Google Patents
Polarization-preserving fiber acousto-optic switch Download PDFInfo
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- CN105301806A CN105301806A CN201510816697.4A CN201510816697A CN105301806A CN 105301806 A CN105301806 A CN 105301806A CN 201510816697 A CN201510816697 A CN 201510816697A CN 105301806 A CN105301806 A CN 105301806A
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- acousto
- optic
- optical fibre
- collimating apparatus
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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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention discloses a polarization-preserving fiber acousto-optic switch which comprises a shell, wherein an input end collimator is arranged at an input end in the shell; n output end collimators are arranged at an output end; an acousto-optic device is arranged between the input end collimator and n output end collimators; the input end collimator is connected with an input polarization-preserving fiber; each output end collimator is respectively connected with an output polarization-preserving fiber; after the incident light enters into an acousto-optic medium through the input end collimator, the incident light and n frequency ultrasonic transverse waves in the acousto-optic medium are subjected to abnormal acousto-optic interaction, n paths of diffraction light are formed and the incident light respectively enters into the output polarization-preserving fiber through the output end collimators. The polarization-preserving fiber acousto-optic switch is high in polarization extinction ratio and is capable of simultaneously sending a beam of light signals into two or more light paths.
Description
Technical field
The present invention relates to a kind of optical device, belong to acoustooptic technique field, particularly relate to a kind of polarization maintaining optical fibre acousto-optic photoswitch.
Background technology
In recent years, optical coherence based on linearly polarized light detects and obtains tremendous development, significantly improves coherent detection
signal to noise ratio (S/N ratio)and measurement
precision, be 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, frequent needs use high speed, High Extinction Ratio, long-life without moving-member and can bear the acousto-optic photoswitch of high power laser light, but current optical fiber acousto-optic photoswitch is all adopt compressional wave to make, and can not be optimized process, reduce coherent detection to polarization state
signal to noise ratio (S/N ratio)and measurement
precision.Simultaneously, polarization maintaining optical fibre is in pulling process, the fault of construction produced due to inside of optical fibre can cause the decline protecting bias energy, namely when linearly polarized light is along feature axis transmission of optical fiber, part optical signals can be coupled into another feature axis vertical with it, finally cause the polarization extinction ratio of light signal to worsen, therefore need to take first piece optimization polarization extinction ratios such as analyzer in the optical path, which increase the complicacy of light path.
In the process of carrying out optical information processing, in order to obtain more metrical information, often need light beam signal to be distributed in two or more light path simultaneously, current optical fiber acousto-optic photoswitch (public announcement of a patent application CN104297952) needs two or more acousto-optical device to realize, complex structure, cost is higher, and can not be optimized the polarization extinction ratio worsened.
In addition, it is all Single wavelength " V " the shape anti-reflection film be coated with for use wavelength that current optical fiber acousto-optic photoswitch leads to light face, limits the usable range of optical fiber acousto-optic photoswitch.
Summary of the invention
For prior art above shortcomings, the object of the invention is 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, a kind of polarization maintaining optical fibre acousto-optic photoswitch being applicable to wide spectral laser is provided.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is such: a kind of polarization maintaining optical fibre acousto-optic photoswitch, comprises housing, and in housing, input end is provided with an input end collimating apparatus, and output terminal is provided with n output terminal collimating apparatus, wherein, and n >=1; An acousto-optical device is provided with between input end collimating apparatus and n output terminal collimating apparatus, described acousto-optical device comprises acousto-optic medium, piezoelectric transducer, matching network and high-frequency socket, it is characterized in that: described input end collimating apparatus is connected with input polarization maintaining optical fibre, and each output terminal collimating apparatus exports polarization maintaining optical fibre with one respectively and is connected; 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 niobate, 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 matching network, and n high-frequency signal is converted into n shearing wave by piezoelectric transducer, and described shearing wave is input to through weld layer the ultrasonic shear waves forming n frequency after acousto-optic medium; Incident light is after input end collimating apparatus enters acousto-optic medium, unusual acoustic optic interaction is there is with the ultrasonic shear waves of the frequency of the n in acousto-optic medium, form n road diffraction light, n road diffraction light is linearly polarized light, and enters after output terminal collimating apparatus respectively in output polarization maintaining optical fibre.
Further, two of described acousto-optic medium logical light faces have all been coated with the number of plies is at least 4 layer dielectrics.
Further, described deielectric-coating is the wide spectral anti-reflection film that can reduce light reflection, and this wide spectral anti-reflection film is less than 2% wavelength 1 μm to the reflectivity within the scope of 1.6 μm.
Further, the deielectric-coating number of plies that the logical light face of described acousto-optic medium is coated with is 8 layers, and wherein, described deielectric-coating comprises zirconium oxide film and silicon oxide film, and zirconium oxide film and silicon oxide film are alternately distributed.
Further, the logical direction, 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, tool of the present invention has the following advantages:
1, polarization extinction ratio is optimized; Theoretical according to unusual acoustic optic interaction, what polarization maintaining optical fibre acousto-optic photoswitch exported is all linearly polarized light.Linear polarization flashlight can worsen through polarization maintaining optical fibre long range propagation rear polarizer extinction ratio, but no matter polarization extinction ratio has worsen more, linearly polarized light can be obtained after polarization maintaining optical fibre acousto-optic photoswitch, namely polarization extinction ratio is optimized, and do not need extra analyzer, simplify light path design.
2, only use an acousto-optical device to achieve an input n road, road to export, be convenient to the analyzing and processing of light signal.
The light intensity of the n road diffraction light 3, exported is controlled (minimum can be 0), can export on a road, can export by two-way simultaneously, also can export on n road simultaneously, the intensity of rapid adjustment diffraction light can also be carried out, for the light intensity on each road of reasonable distribution output terminal creates condition by electric power.
4, two of acousto-optic medium logical light faces have all been coated with the wide spectral anti-reflection film of the minimizing light reflection being no less than 4 layers, this wide spectral anti-reflection film is less than 2% wavelength 1 μm to the reflectivity within the scope of 1.6 μm, make polarization maintaining optical fibre acousto-optic photoswitch go for wider spectral range, 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 end collimating apparatus, 3-output terminal collimating apparatus, the 31-the first output terminal collimating apparatus, 32-the second output terminal collimating apparatus, 33-the three output terminal collimating apparatus, 4-acousto-optical device, 41-acousto-optic medium, 42-piezoelectric transducer, 43-matching network, 44-high-frequency socket, 5-input polarization maintaining optical fibre, 6-export polarization maintaining optical fibre, 7-incident light, 8-diffraction light, the 81-the first diffraction light, 82-the second diffraction light, 83-the three diffraction light, X-logical direction, sound face, ［ 110 ］-［ 110 ］ axle.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment: a kind of polarization maintaining optical fibre acousto-optic photoswitch, comprises housing 1, and input end is provided with an input end collimating apparatus 2 in housing 1, and output terminal is provided with n output terminal collimating apparatus 3, wherein, n >=1.Between input end collimating apparatus 2 and n output terminal collimating apparatus 3, be provided with an acousto-optical device 4, described acousto-optical device 4 comprises acousto-optic medium 41, piezoelectric transducer 42, matching network 43 and high-frequency socket 44.Described input end collimating apparatus 2 is connected with input polarization maintaining optical fibre 5, and each output terminal collimating apparatus 3 exports polarization maintaining optical fibre 6 with one respectively and is connected, to ensure the polarization extinction ratio outputed signal.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 niobate, wherein, the logical sound face direction X(of acousto-optic medium 41 [110] axle (axis) and piezoelectric transducer 42 is namely perpendicular to the direction in logical sound face) between angle be θ, this angle theta size is 6 ± 1 °.
Angle theta is relevant with the bandwidth that acousto-optical device 4 works; Angle theta is larger, centre frequency and the bandwidth of acousto-optical device 4 work are also larger, namely incident light 7 is wider with the frequency range of ultrasonic shear waves generation acoustic optic interaction, more output terminal interface can be made, but at this moment the frequency of operation of ultrasonic shear waves is higher, decay is comparatively large (decay of ultrasonic shear waves and frequency of operation square be directly proportional), the intensity of diffraction light 8 is lower, and the Insertion Loss of optical fiber acousto-optic photoswitch is higher; Otherwise, angle theta is less, centre frequency and the bandwidth of acousto-optical device 4 work are also less, namely incident light 7 is narrower with the frequency range of ultrasonic shear waves generation acoustic optic interaction, less output terminal interface can only be made, but at this moment the frequency of operation of ultrasonic shear waves is lower, decay is less, and the intensity of diffraction light 8 is higher, and the Insertion Loss of optical fiber acousto-optic photoswitch is lower.Therefore, best angle theta to be determined according to service condition.
For l × 2 or l × 3 optical fiber acousto-optic photoswitch, the optimum value of the angle theta of acousto-optic medium 41 ［ 110 ］ axle and logical sound face direction X is 6 ° (control errors is within the scope of 1 °), and the bandwidth range that at this moment acousto-optical device 4 works is 40MHz--80MHz.When needs increase output port quantity, suitably can strengthen the angle theta of acousto-optic medium 41 ［ 110 ］ axle and logical sound face direction X, at this moment the centre frequency of acousto-optical device 4 and bandwidth 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 be increased to 6, but at this moment the intensity of diffraction light 8 is lower, the Insertion Loss of optical fiber acousto-optic photoswitch is higher.
N the high-frequency signal inputted by high-frequency socket 44, inputs piezoelectric transducer 42 through matching network 43, 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 described shearing wave is input to through weld layer the ultrasonic shear waves forming n frequency after acousto-optic medium 41.Incident light 7 enters after acousto-optic medium 41 through input end collimating apparatus 2, unusual acoustic optic interaction is there is with the ultrasonic shear waves of the frequency of the n in acousto-optic medium 41, form n road diffraction light 8, this n road diffraction light 8 is linearly polarized light (this is determined by the principle of unusual acoustic optic interaction), and is entered in output optical fibre by output terminal collimating apparatus 3 respectively.
Two logical light faces 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 spectral anti-reflection film that can reduce light reflection, and this wide spectral anti-reflection film is less than 2% wavelength 1 μm to the reflectivity within the scope of 1.6 μm, the number of plies of wide spectral anti-reflection film is more, and spectral width is larger, and reflectivity is lower, otherwise, the number of plies of wide spectral anti-reflection film is fewer, spectral width is less, reflectivity is higher, therefore situation must must be made according to technique by wide spectral anti-reflection film, the characteristic of coating materials, spectral range, reflectivity etc. design best coating materials thickness and the number of plies, such as the wide spectral anti-reflection film of wavelength 1 micron to 1.6 micrometer ranges, require that its reflectivity is less than 2%, the deielectric-coating number of plies that the logical light face of described acousto-optic medium 41 is coated with is 8 layers, wherein, described deielectric-coating comprises zirconium oxide film and silicon oxide film, and zirconium oxide film and silicon oxide film are alternately distributed: see Fig. 3, during concrete enforcement, from the coating materials number in the logical light face 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, see Fig. 1, described output terminal collimating apparatus 3 is the two: first output terminal collimating apparatus and the second output terminal collimating apparatus.
As another kind of embodiment, see Fig. 2, described output terminal collimating apparatus 3 is the three: first output terminal collimating apparatus 31 and the second output terminal collimating apparatus 32, and the 3rd output terminal collimating apparatus 32.
During concrete enforcement, angle theta gets 6 degree, and the transductive material thickness of piezoelectric transducer 42 is 40 μm, and the centre frequency that at this moment piezoelectric transducer 42 works 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 frequencies differ each other and are not less than 20MHz.These three frequency signals input the table electrode of piezoelectric transducer 42 through matching network 43, these three frequency signals are 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 with the ultrasonic shear waves (frequency is f1, f2 and f3) in acousto-optic medium 41 in incident light 7, and then produce diffraction light 8: the first diffraction light 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 output terminal collimating apparatus 31, second diffraction light 82 exports from polarization maintaining optical fibre after the second output terminal collimating apparatus 32,3rd diffraction light 83 exports from polarization maintaining optical fibre after the 3rd output terminal collimating apparatus 33, and the light signal obtained from these three polarization maintaining optical fibres has higher polarization extinction ratio (25dB).
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention but not restriction technologies scheme, those of ordinary skill in the art is to be understood that, those are modified to technical scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.
Claims (6)
1. a polarization maintaining optical fibre acousto-optic photoswitch, comprises housing, and in housing, input end is provided with an input end collimating apparatus, and output terminal is provided with n output terminal collimating apparatus, wherein, and n >=1; An acousto-optical device is provided with between input end collimating apparatus and n output terminal collimating apparatus, described acousto-optical device comprises acousto-optic medium, piezoelectric transducer, matching network and high-frequency socket, it is characterized in that: described input end collimating apparatus is connected with input polarization maintaining optical fibre, and each output terminal collimating apparatus exports polarization maintaining optical fibre with one respectively and is connected; 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 niobate, 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 matching network, and n high-frequency signal is converted into n shearing wave by piezoelectric transducer, and described shearing wave is input to through weld layer the ultrasonic shear waves forming n frequency after acousto-optic medium; Incident light is after input end collimating apparatus enters acousto-optic medium, unusual acoustic optic interaction is there is with the ultrasonic shear waves of the frequency of the n in acousto-optic medium, form n road diffraction light, n road diffraction light is linearly polarized light, and enters after output terminal collimating apparatus respectively in output polarization maintaining optical fibre.
2. a kind of polarization maintaining optical fibre acousto-optic photoswitch according to claim 1, is characterized in that: it is at least 4 layer dielectrics that two logical light faces of described acousto-optic medium have all been coated with the number of plies.
3. a kind of polarization maintaining optical fibre acousto-optic photoswitch according to claim 2, is characterized in that: described deielectric-coating is the wide spectral anti-reflection film that can reduce light reflection, and this wide spectral anti-reflection film is less than 2% wavelength 1 μm to the reflectivity within the scope of 1.6 μm.
4. a kind of polarization maintaining optical fibre acousto-optic photoswitch according to claim 3, it is characterized in that: the deielectric-coating number of plies that the logical light face of described acousto-optic medium is coated with is 8 layers, wherein, described deielectric-coating comprises zirconium oxide film and silicon oxide film, and zirconium oxide film and silicon oxide film are alternately distributed.
5. a kind of polarization maintaining optical fibre acousto-optic photoswitch according to claim 1, is characterized in that: the logical direction, sound face of piezoelectric transducer and the angle theta of acousto-optic medium ［ 110 ］ axle are 6 ± 1 °.
6. a kind of polarization maintaining optical fibre acousto-optic photoswitch according to claim 1, is characterized in that: between n high-frequency signal, frequency phase-difference is not less than 20MHz.
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| CN201510816697.4A CN105301806B (en) | 2015-11-23 | 2015-11-23 | A kind of polarization maintaining optical fibre acousto-optic photoswitch |
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| CN201510816697.4A CN105301806B (en) | 2015-11-23 | 2015-11-23 | A kind of polarization maintaining optical fibre acousto-optic photoswitch |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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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| JPS62246017A (en) * | 1986-04-18 | 1987-10-27 | Nec Corp | Acoustooptic switch |
| JPS63307434A (en) * | 1987-06-10 | 1988-12-15 | Nec Corp | Acoustooptic switch |
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Cited By (2)
| 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 |
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| CN105301806B (en) | 2016-08-17 |
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