CN104280824A - Polarization maintaining optical fiber coupling acousto-optic device with high polarization extinction ratio - Google Patents
Polarization maintaining optical fiber coupling acousto-optic device with high polarization extinction ratio Download PDFInfo
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- CN104280824A CN104280824A CN201410581161.4A CN201410581161A CN104280824A CN 104280824 A CN104280824 A CN 104280824A CN 201410581161 A CN201410581161 A CN 201410581161A CN 104280824 A CN104280824 A CN 104280824A
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- maintaining optical
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2793—Controlling polarisation dependent loss, e.g. polarisation insensitivity, reducing the change in polarisation degree of the output light even if the input polarisation state fluctuates
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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)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention relates to a polarization maintaining optical fiber coupling acousto-optic device, in particular to a polarization maintaining optical fiber coupling acousto-optic device with a high polarization extinction ratio. The transmission main shaft direction of a first polarization maintaining optical fiber collimator and the intrinsic incident light polarization direction of an acousto-optic crystal are on the same straight line; a second polarization element is further fixed in a light transmission line formed by a second polarization maintaining optical fiber collimator and the acousto-optic crystal, and the transmission main shaft direction of the second polarization maintaining optical fiber collimator and the intrinsic diffraction light polarization direction of the acousto-optic crystal are on the same straight line. The light passing main shaft direction of the second polarization element and the transmission main shaft direction of the second polarization maintaining optical fiber collimator are on the same straight line. The incident light of the acousto-optic crystal is emitted in the intrinsic incident light polarization direction of the acousto-optic crystal, the diffraction light of the acousto-optic crystal is output in the intrinsic diffraction light polarization direction of the acousto-optic crystal, and the influence of the polarization transmission property of the acousto-optic crystal is reduced. The polarization elements are utilized for eliminating the influence of the countershaft error of an optical fiber connector to the transmission light polarization property, and the influence of the polarization transmission property of the acousto-optic crystal to the transmission light polarization property is reduced.
Description
Technical field
The invention belongs to acousto-optic device field, particularly relate to the polarization maintaining optical fibre coupling acousto-optic device with high polarization extinction ratio.
Background technology
Polarization maintaining optical fibre coupling acousto-optic device is on the basis of free space optical acousto-optic device, adopts polarization maintaining optical fibre to carry out the acousto-optic device of light path coupling.Its input and output light is linearly polarized light, can be used on the propagation characteristic changing light in polarization maintaining optical fibre system easily.This device adopts all solidstate light path, does not need to carry out optical path adjusting after incoming fiber optic system, have easy to use, be easy to integrated, reliability high, in field extensive application such as optical signal prosessing, Fibre Optical Sensor, fiber lasers.
The primary structure of existing polarization maintaining optical fibre coupling acousto-optic device (as shown in Figure 1) comprises the first polarization maintaining optical fiber collimator, acousto-optic crsytal, the second polarization maintaining optical fiber collimator, radio frequency connector, match circuit plate and mounting casing.Described mounting casing has an inner chamber.Radio frequency connector is fixed on the outside surface of mounting casing, and is electrically connected with match circuit plate, for the radiofrequency signal of reception is applied to acousto-optic crsytal through match circuit plate.Match circuit plate is fixed on the position near radio frequency connector in mounting casing inner chamber.Acousto-optic crsytal is fixed in mounting casing inner chamber, and is electrically connected with match circuit plate, for the radiofrequency signal applied through match circuit plate received RF connector, forms ultrasonic sound field.First polarization maintaining optical fiber collimator is fixed on the side of acousto-optic crsytal incident light; Second polarization maintaining optical fiber collimator is fixed on the side of acousto-optic crsytal diffraction light.Input line polarized light enters acousto-optic crsytal by the first polarization maintaining optical fiber collimator from acousto-optic crsytal incident light side, with ultrasonic sound field effect generation acoustooptic diffraction, after diffraction light exports acousto-optic crsytal along acousto-optic crsytal diffraction light side, received by the second polarization maintaining optical fiber collimator and transmit backward.
In polarization maintaining optical fibre system, the polarization transfer characteristics of acousto-optic crsytal self reduces causing the polarized light polarization characteristic entering the second polarization maintaining optical fiber collimator.In addition, because polarization maintaining optical fibre is also coupled together by several joints of optical fibre by polarization maintaining optical fibre coupling acousto-optic device front end (i.e. input line direction of polarized light).Owing to unavoidably existing axis error between the joints of optical fibre, causing input line polarized light to there will be polarization characteristic when entering acousto-optic device to decline, adopting the polarization maintaining optical fibre coupling acousto-optic device of this structure to export the polarization extinction ratio of polarized light generally at 15-20dB.
Summary of the invention
For above-mentioned the deficiencies in the prior art, technical matters solved by the invention how to provide a kind of polarization maintaining optical fibre coupling acousto-optic device with high polarization extinction ratio improving transmission light polarization characteristic.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
There is the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio, comprise the first polarization maintaining optical fiber collimator, acousto-optic crsytal, the second polarization maintaining optical fiber collimator and mounting casing; Described mounting casing has an inner chamber; Acousto-optic crsytal is fixed in the inner chamber of mounting casing; First polarization maintaining optical fiber collimator is fixed on the side of acousto-optic crsytal incident light; Second polarization maintaining optical fiber collimator is fixed on the side of acousto-optic crsytal diffraction light; The transmission major axes orientation of described first polarization maintaining optical fiber collimator and the intrinsic incident light polarization direction of acousto-optic crsytal are located along the same line; Also be fixed with the second polarizer in the optical transmission line that described second polarization maintaining optical fiber collimator and described acousto-optic crsytal are formed, the transmission major axes orientation of the second polarization maintaining optical fiber collimator and the intrinsic diffraction light polarization direction of acousto-optic crsytal are located along the same line; The logical light major axes orientation of the second polarizer and the transmission major axes orientation of the second polarization maintaining optical fiber collimator are located along the same line.
Further, described second polarizer is polaroid, Glan prism or analyzing crystal.
Further, the logical light face of described second polarizer is coated with optical anti-reflective film.
Further, also be fixed with the first polarizer in the optical transmission line that described first polarization maintaining optical fiber collimator and described acousto-optic crsytal are formed, the logical light major axes orientation of described first polarizer and the transmission major axes orientation of the first polarization maintaining optical fiber collimator are located along the same line.
Further, described first polarizer is polaroid, Glan prism or analyzing crystal.
Further, the logical light face of described first polarizer is coated with optical anti-reflective film.
Further, also comprise 4 sectional fixtures, each sectional fixture comprises outer barrel and interior barrel, and outer barrel is fixed in the inner chamber of mounting casing, and interior barrel interlocking is on the medial surface of outer barrel; 4 sectional fixtures are respectively the first polarizer sectional fixture, the second polarizer sectional fixture, the first polarization maintaining optical fiber collimator sectional fixture and the second polarization maintaining optical fiber collimator sectional fixture, its interior barrel is fixed on the first polarizer, the second polarizer, the first polarization maintaining optical fiber collimator and the second polarization maintaining optical fiber collimator, and the first polarizer, the second polarizer, the first polarization maintaining optical fiber collimator and the second polarization maintaining optical fiber collimator can relatively rotate with the outer barrel that interior barrel is corresponding with it respectively; The axis direction of the axis direction of the interior barrel of the first polarizer sectional fixture and the interior barrel of the first polarization maintaining optical fiber collimator sectional fixture coincides; The axis direction of the axis direction of the interior barrel of the second polarizer sectional fixture and the interior barrel of the second polarization maintaining optical fiber collimator sectional fixture coincides.
Further, described sectional fixture also has latch mechanism, and latch mechanism, for locking its outer barrel and interior barrel, makes outer barrel relative with interior barrel fixing.
Relative to prior art, the present invention has the following advantages:
1. polarization maintaining optical fibre coupling acousto-optic device provided by the invention, its acousto-optic crsytal incident light is incident along the intrinsic incident light polarization direction of acousto-optic crsytal, acousto-optic crsytal diffraction light exports along acousto-optic crsytal intrinsic diffraction light polarization direction, reduces the impact that acousto-optic crsytal self polarization transfer characteristics brings.
2. polarization maintaining optical fibre coupling acousto-optic device provided by the invention, polarizer is provided with between the optical transmission line that first, second polarization maintaining optical fiber collimator and acousto-optic crsytal are formed, utilize polarizer to eliminate the impact caused transmission light polarization characteristic axis error of the joints of optical fibre, also reduce the impact that acousto-optic crsytal self polarization transfer characteristics causes transmission light polarization characteristic further.
3. polarization maintaining optical fibre coupling acousto-optic device provided by the invention, first, second polarization maintaining optical fiber collimator, first, second polarizer adopt internal rotation type sectional fixture to fix, and are convenient to polarization and regulate.
4. the output light polarization extinction ratio of polarization maintaining optical fibre coupling acousto-optic device provided by the invention can reach more than 30dB.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of existing polarization maintaining optical fibre coupling acousto-optic device.
Fig. 2 is the schematic diagram of a kind of embodiment of the present invention.
Fig. 3 is the schematic diagram of another kind of embodiment of the present invention.
Fig. 4 is the sectional view of a kind of embodiment of polarization maintaining optical fiber collimator sectional fixture of the present invention.
Fig. 5 is the sectional view of a kind of embodiment of polarizer sectional fixture of the present invention.
Wherein: the 1-1 joints of optical fibre, 1-2 first polarization maintaining optical fiber collimator, 1-3 acousto-optic crsytal, 1-4 second polarization maintaining optical fiber collimator, 1-6 first polarizer, 1-7 second polarizer, 1-8 radio frequency connector, 1-9 match circuit plate, 1-10 shell, 2 polarization maintaining optical fiber collimator sectional fixtures, 2-1 interior barrel, 2-2 outer barrel, 3 polarizer sectional fixtures, 2-1 interior barrel, 2-2 outer barrel, 4 screws.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment:
The primary structure of polarization maintaining optical fibre coupling acousto-optic device of the prior art comprises the first polarization maintaining optical fiber collimator 1-2, acousto-optic crsytal 1-3, the second polarization maintaining optical fiber collimator 1-4, radio frequency connector 1-8, match circuit plate 1-9 and mounting casing 1-10.Described mounting casing has an inner chamber.Radio frequency connector 1-8 is fixed on the outside surface of mounting casing 1-10, and is electrically connected with match circuit plate 1-9, for the radiofrequency signal of reception is applied to acousto-optic crsytal 1-3 through match circuit plate.Match circuit plate 1-9 is fixed on the position near radio frequency connector 1-8 in mounting casing inner chamber.Acousto-optic crsytal 1-3 is fixed in mounting casing inner chamber, and is electrically connected with match circuit plate 1-9, for the radiofrequency signal applied through match circuit plate received RF connector, forms ultrasonic sound field.First polarization maintaining optical fiber collimator 1-2 is fixed on the side of acousto-optic crsytal incident light; Second polarization maintaining optical fiber collimator 1-4 is fixed on the side of acousto-optic crsytal diffraction light.Input line polarized light enters acousto-optic crsytal by the first polarization maintaining optical fiber collimator 1-2 from acousto-optic crsytal incident light side, with ultrasonic sound field effect generation acoustooptic diffraction, after diffraction light exports acousto-optic crsytal along acousto-optic crsytal diffraction light side, received by the second polarization maintaining optical fiber collimator 1-4 and transmit backward.This polarization maintaining optical fibre coupling acousto-optic device polarization characteristic is poor, and polarization extinction is lower.
In order to solve the above-mentioned defect of the polarization maintaining optical fibre coupling acousto-optic device of prior art, the present invention has done above-mentioned polarization maintaining optical fibre coupling acousto-optic device and has improved, as shown in Figure 2, the transmission major axes orientation of the first described polarization maintaining optical fiber collimator 1-2 and the intrinsic incident light polarization direction of acousto-optic crsytal 1-3 are located along the same line; Also be fixed with the second polarizer 1-7 in the optical transmission line that described second polarization maintaining optical fiber collimator 1-4 and described acousto-optic crsytal 1-3 is formed, the transmission major axes orientation of the second polarization maintaining optical fiber collimator 1-4 and the intrinsic diffraction light polarization direction of acousto-optic crsytal 1-3 are located along the same line; The logical light major axes orientation of the second polarizer 1-7 and the transmission major axes orientation of the second polarization maintaining optical fiber collimator 1-4 are located along the same line.
Principle of work of the present invention is: radiofrequency signal enters polarization maintaining optical fibre coupling acousto-optic device from radio frequency connector, acts on acousto-optic crsytal, make to form ultrasonic sound field in acousto-optic crsytal by match circuit plate.Input line polarized light is by the first polarization maintaining optical fiber collimator input polarization maintaining optical fibre coupling acousto-optic device, acousto-optic crsytal is entered along acousto-optic crsytal intrinsic incident light polarization direction, with ultrasonic sound field effect generation acoustooptic diffraction, diffraction light exports acousto-optic crsytal along acousto-optic crsytal intrinsic diffraction light polarization direction, the diffraction light polarization characteristic entering the second polarization maintaining optical fiber collimator is eliminated through the second polarizer, after the impact that self polarization transfer characteristics of the low acousto-optic crsytal of a step-down of going forward side by side causes transmission light polarization characteristic, received by the second polarization maintaining optical fiber collimator and transmit backward.
Described second polarizer selects the optical element that the linearly polarized light with fixing polarization direction can only be allowed to pass through, such as polaroid, Glan prism or analyzing crystal.
The logical light face of described second polarizer being coated with optical anti-reflective film, for reducing the reflected light of the second polarizer, improving the permeability of light in the second polarizer.
In order to improve the polarization characteristic of polarization maintaining optical fibre coupling acousto-optic device better, obtain higher polarization extinction ratio.As shown in Figure 3, the first polarizer 1-6 is also fixed with in the optical transmission line that described first polarization maintaining optical fiber collimator 1-2 and described acousto-optic crsytal 1-3 is formed; The logical light major axes orientation of the first polarizer 1-6 and the transmission major axes orientation of the first polarization maintaining optical fiber collimator 1-2 are located along the same line.Eliminated by the first polarizer and by the joints of optical fibre, the input polarization light polarization that axis error brings is declined; The diffraction light polarization characteristic entering the second polarization maintaining optical fiber collimator is improved further, the final output light obtaining high polarization extinction ratio by the second polarizer.
With the second polarizer, described first polarizer is polaroid, Glan prism or analyzing crystal.Its logical light face is coated with optical anti-reflective film.
Conveniently regulate the logical light major axes orientation of the logical light major axes orientation of the first polarizer, the second polarizer, the transmission major axes orientation of the first polarization maintaining optical fiber collimator and the transmission major axes orientation of the second polarization maintaining optical fiber collimator.The polarization maintaining optical fibre coupling acousto-optic device of the present embodiment, also comprise 4 sectional fixtures, each sectional fixture comprises outer barrel 2-2 and interior barrel 2-1, and outer barrel 2-2 is fixed in the inner chamber of mounting casing, and interior barrel 2-1 interlocking is on the medial surface of outer barrel, 4 sectional fixtures are respectively the first polarizer sectional fixture, second polarizer sectional fixture, first polarization maintaining optical fiber collimator sectional fixture and the second polarization maintaining optical fiber collimator sectional fixture, its interior barrel is fixed on the first polarizer, second polarizer, on first polarization maintaining optical fiber collimator and the second polarization maintaining optical fiber collimator, for convenience of description, first polarizer sectional fixture and the second polarizer sectional fixture are referred to as polarizer sectional fixture 3, first polarization maintaining optical fiber collimator sectional fixture and the second polarization maintaining optical fiber collimator sectional fixture are referred to as polarization maintaining optical fiber collimator sectional fixture 2.First polarizer, the second polarizer, the first polarization maintaining optical fiber collimator and the second polarization maintaining optical fiber collimator can relatively rotate with the outer barrel that interior barrel is corresponding with it respectively; The axis direction of the axis direction of the interior barrel of the first polarizer sectional fixture and the interior barrel of the first polarization maintaining optical fiber collimator sectional fixture coincides; The axis direction of the axis direction of the interior barrel of the second polarizer sectional fixture and the interior barrel of the second polarization maintaining optical fiber collimator sectional fixture coincides.Like this, when needing the transmission major axes orientation of the logical light major axes orientation of adjustment first polarizer, the logical light major axes orientation of the second polarizer, the transmission major axes orientation of the first polarization maintaining optical fiber collimator and the second polarization maintaining optical fiber collimator, interior barrel in the sectional fixture of correspondence or components and parts can be rotated around the axis direction of interior barrel respectively, be convenient to polarization and regulate.During concrete enforcement, the outer barrel of sectional fixture can use screw and or solidification glue be secured in the inner chamber of mounting casing.
In order to make the sectional fixture adjusting components and parts direction not deflect, described sectional fixture also has latch mechanism, and latch mechanism, for locking its outer barrel and interior barrel, makes outer barrel relative with interior barrel fixing.During concrete enforcement, outer barrel in sectional fixture and interior barrel can be locked by screw.As shown in Figure 4,5, Fig. 4 is a kind of embodiment of polarization maintaining optical fiber collimator sectional fixture 2, during use, is changed the transmission major axes orientation of first, second polarization maintaining optical fiber collimator by rotating inner part cylinder.Fig. 5 is a kind of embodiment of polarizer sectional fixture 3, and changed the logical light major axes orientation of first, second polarizer by rotating inner part cylinder, it locks interior barrel and the outer barrel of polarizer sectional fixture with screw.
Described acousto-optic crsytal can be tellurium oxide crystal, Crystals of Lead Molybdate, lithium columbate crystal, GaP crystal, GeAsSe glass, dense flint glass or fused quartz glass.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. there is the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio, comprise the first polarization maintaining optical fiber collimator, acousto-optic crsytal, the second polarization maintaining optical fiber collimator and mounting casing; Described mounting casing has an inner chamber; Acousto-optic crsytal is fixed in the inner chamber of mounting casing; First polarization maintaining optical fiber collimator is fixed on the side of acousto-optic crsytal incident light; Second polarization maintaining optical fiber collimator is fixed on the side of acousto-optic crsytal diffraction light; It is characterized in that, the transmission major axes orientation of described first polarization maintaining optical fiber collimator and the intrinsic incident light polarization direction of acousto-optic crsytal are located along the same line; Also be fixed with the second polarizer in the optical transmission line that described second polarization maintaining optical fiber collimator and described acousto-optic crsytal are formed, the transmission major axes orientation of the second polarization maintaining optical fiber collimator and the intrinsic diffraction light polarization direction of acousto-optic crsytal are located along the same line; The logical light major axes orientation of the second polarizer and the transmission major axes orientation of the second polarization maintaining optical fiber collimator are located along the same line.
2. have the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio as claimed in claim 1, it is characterized in that, described second polarizer is polaroid, Glan prism or analyzing crystal.
3. there is the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio as claimed in claim 1, it is characterized in that, the logical light face of described second polarizer is coated with optical anti-reflective film.
4. there is the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio as claimed in claim 1, it is characterized in that, also be fixed with the first polarizer in the optical transmission line that described first polarization maintaining optical fiber collimator and described acousto-optic crsytal are formed, the logical light major axes orientation of described first polarizer and the transmission major axes orientation of the first polarization maintaining optical fiber collimator are located along the same line.
5. have the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio as claimed in claim 4, it is characterized in that, described first polarizer is polaroid, Glan prism or analyzing crystal.
6. there is the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio as claimed in claim 4, it is characterized in that, the logical light face of described first polarizer is coated with optical anti-reflective film.
7. the polarization maintaining optical fibre coupling acousto-optic device with high polarization extinction ratio as described in claim arbitrary in claim 4 ~ 6, it is characterized in that, also comprise 4 sectional fixtures, each sectional fixture comprises outer barrel and interior barrel, outer barrel is fixed in the inner chamber of mounting casing, and interior barrel interlocking is on the medial surface of outer barrel; 4 sectional fixtures are respectively the first polarizer sectional fixture, the second polarizer sectional fixture, the first polarization maintaining optical fiber collimator sectional fixture and the second polarization maintaining optical fiber collimator sectional fixture, its interior barrel is fixed on the first polarizer, the second polarizer, the first polarization maintaining optical fiber collimator and the second polarization maintaining optical fiber collimator, and the first polarizer, the second polarizer, the first polarization maintaining optical fiber collimator and the second polarization maintaining optical fiber collimator can relatively rotate with the outer barrel that interior barrel is corresponding with it respectively; The axis direction of the axis direction of the interior barrel of the first polarizer sectional fixture and the interior barrel of the first polarization maintaining optical fiber collimator sectional fixture coincides; The axis direction of the axis direction of the interior barrel of the second polarizer sectional fixture and the interior barrel of the second polarization maintaining optical fiber collimator sectional fixture coincides.
8. have the polarization maintaining optical fibre coupling acousto-optic device of high polarization extinction ratio as claimed in claim 7, it is characterized in that, described sectional fixture also has latch mechanism, and latch mechanism, for locking its outer barrel and interior barrel, makes outer barrel relative with interior barrel fixing.
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| CN108873394A (en) * | 2018-08-09 | 2018-11-23 | 中国电子科技集团公司第二十六研究所 | A kind of polarization maintaining optical fibre acousto-optic electro-optical device |
| CN109164606A (en) * | 2018-09-19 | 2019-01-08 | 中国电子科技集团公司第二十六研究所 | A kind of fiber acouso optic device with high-performance stability |
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| CN108873394B (en) * | 2018-08-09 | 2021-09-28 | 中国电子科技集团公司第二十六研究所 | Polarization maintaining optical fiber acousto-optic electro-optic device |
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| CN104280824B (en) | 2018-01-26 |
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