CN103076654A - Polarization maintaining optical fiber acousto-optic frequency shift device - Google Patents
Polarization maintaining optical fiber acousto-optic frequency shift device Download PDFInfo
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- CN103076654A CN103076654A CN2013100668530A CN201310066853A CN103076654A CN 103076654 A CN103076654 A CN 103076654A CN 2013100668530 A CN2013100668530 A CN 2013100668530A CN 201310066853 A CN201310066853 A CN 201310066853A CN 103076654 A CN103076654 A CN 103076654A
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Abstract
The invention discloses a polarization maintaining optical fiber acousto-optic frequency shift device, which comprises a first polarization maintaining optical fiber, a first collimator, an acousto-optic switch device, a second collimator and a second polarization maintaining optical fiber. The first polarization maintaining optical fiber is connected with the first collimator; the second collimator is connected with the second polarization maintaining optical fiber; the first collimator and the second collimator are respectively arranged on two sides of the acousto-optic switch device at a certain angle, and are in space coupling by the acousto-optic switch device; after light is polarized, the light is input to a slow axis of the first polarization maintaining optical fiber, then the light is output by the first collimator after the light is transmitted by the first polarization maintaining optical fiber; the incident light which is output by the first collimator enters the acousto-optic switch device at a certain angle and Bragg diffraction occurs to generate first level diffraction light; the first level diffraction light is received by the second collimator; and the first level diffraction light is input to a slow axis of the second polarization maintaining optical fiber by the second collimator and is output by the second polarization maintaining optical fiber. The polarization maintaining optical fiber acousto-optic frequency shift device can realize linearly polarized light frequency shift output, and the polarized extinction of the output light is higher, so that the insertion loss of a system is lower, and precision is higher.
Description
Technical field
The present invention relates to the acousto-optic frequency translation technical field, particularly relate to a kind of polarization maintaining optical fibre acousto-optic frequency translation device.
Background technology
The optical fiber acousto-optic frequency shifters because low, response time of insertion loss is fast, compact conformation, without many merits such as moving-members, extensive application in the systems such as laser deflection, the processing of laser frequency-shift signaling, coherent signal processing, heterodyne signal processing.
The optical fiber acousto-optic frequency shifters of prior art adopts general single mode fiber to carry out input and output more, yet some systems need to guarantee input and output polarisation of light consistance when the shift frequency light signal is processed, to reduce the treatment capacity of system, improve the processing accuracy of system.
Simultaneously, carry out the system that light signal is processed with linearly polarized light, can again be polarized processing to the output light of processing through shift frequency in the system, general single mode fiber acousto-optic frequency shifters output polarization state is unsettled, affected by temperature, external force etc. very large, therefore light intensity can change at any time after exporting light and pass through partially processing, and it is relatively poor and then may affect system's insertion loss and precision to export the light polarization extinction ratio, can't satisfy the processing requirements of system.
Summary of the invention
The technical matters that the present invention mainly solves provides a kind of polarization maintaining optical fibre acousto-optic frequency translation device, can realize the output of linearly polarized light shift frequency, and output light polarization extinction ratio is higher, and then can be so that system's insertion loss is lower, precision is higher.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of polarization maintaining optical fibre acousto-optic frequency translation device is provided, comprises: the first polarization maintaining optical fibre, first collimator, acoustooptic switch device, the second collimating apparatus and the second polarization maintaining optical fibre; The first polarization maintaining optical fibre connects first collimator, and the second collimating apparatus connects the second polarization maintaining optical fibre, and first collimator and the second collimating apparatus are arranged at respectively at an angle acoustooptic switch device both sides and carry out Space Coupling by the acoustooptic switch device; Wherein, the light that external light source sends inputs to the slow axis of the first polarization maintaining optical fibre and is exported by first collimator after the transmission of the first polarization maintaining optical fibre after rising partially, light from first collimator output is incident to acoustooptic switch device generation Bragg diffraction generation first-order diffraction light at a certain angle, first-order diffraction light is received by the second collimating apparatus, and first-order diffraction light inputs to the slow axis of the second polarization maintaining optical fibre and exports the outside to by the second polarization maintaining optical fibre from the second collimating apparatus.
Wherein, polarization maintaining optical fibre acousto-optic frequency translation device comprises polarization detector, and the input port of polarization detector connects the output port of the second polarization maintaining optical fibre.
Wherein, the acoustooptic switch device comprises driving power and acousto-optical device; Acousto-optical device comprises impedance matching network, electroacoustics transducer and acousto-optic crsytal; Wherein, driving power output rf power signal is after-applied on electroacoustics transducer through impedance matching network, and electroacoustics transducer converts rf power signal to ultrasound wave, and ul-trasonic irradiation forms refractive-index grating in acousto-optic crsytal and at acousto-optic crsytal; First collimator and the second collimating apparatus are arranged at respectively the acousto-optic crsytal both sides and carry out Space Coupling by acousto-optic crsytal.
Wherein, polarization maintaining optical fibre acousto-optic frequency translation device comprises housing, and enclosure interior is provided with radiator; At least first collimator, the second collimating apparatus and acousto-optic crsytal are arranged at enclosure interior, and, acousto-optic crsytal and radiator thermal coupling.
Wherein, polarization maintaining optical fibre acousto-optic frequency translation device comprises the first governor motion and the second governor motion; The first governor motion and the second governor motion all are arranged at enclosure interior, and first collimator is arranged on the first governor motion, and the second collimating apparatus is arranged on the second governor motion; Wherein, the first governor motion is used for regulating the output angle of first collimator, and the second governor motion is used for regulating the receiving angle of the second collimating apparatus.
Wherein, the first governor motion is identical with the second governor motion structure; The first governor motion comprises regulating block and five times regualting frame; Wherein, regulating block is cylindric, the regulating block outer ring is provided with external thread, the regulating block center is provided with at least one mounting hole, by the screw penetrating mounting holes first collimator is fixed on the regulating block, and five times regualting frame one end is fixed in housing, the other end is provided with internal thread, and the threaded by external thread and internal thread is fixed in five times regualting frame with regulating block.
Wherein, the hot spot of first-order diffraction light arrives the second collimating apparatus and is received by the second collimating apparatus; At least the second collimating apparatus and acousto-optic crsytal are separated by a distance and satisfy following relation:
Wherein, L is the distance between the second collimating apparatus and the acousto-optic crsytal, and d is the radius of hot spot,
For first-order diffraction light and light are incident to behind the acousto-optic crsytal along the angle of departure between the original optical path direction of propagation.
Wherein, the acceptance angle of the second collimating apparatus is less than the angle of departure of zero order light and first-order diffraction light
Wherein, the radius d of hot spot is more than or equal to 0.1mm,
Scope is 0.5 °-5 °.
Wherein, the first polarization maintaining optical fibre and the second polarization maintaining optical fibre are single-mode fiber; External light source is laser generator.
The invention has the beneficial effects as follows: the situation that is different from prior art, polarization maintaining optical fibre acousto-optic frequency translation device of the present invention, by the first collimator that will connect the first polarization maintaining optical fibre and the second collimating apparatus that is connected the second polarization maintaining optical fibre and the optically-coupled of acoustooptic switch device, linearly polarized light by first collimator output is incident to acoustooptic switch device generation first-order diffraction light, then the second collimating apparatus receives first-order diffraction light, this first-order diffraction light inputs to the slow axis of the second polarization maintaining optical fibre by the second collimating apparatus and is finally exported by the second polarization maintaining optical fibre, can realize the output of linearly polarized light shift frequency, the output polarization state is not vulnerable to temperature, the factor affecting such as external force, it changes less, output light polarization extinction ratio is higher, and then can be so that system's insertion loss is lower, precision is higher.
Description of drawings
Fig. 1 is the module diagram of polarization maintaining optical fibre acousto-optic frequency translation device the first embodiment of the present invention;
Fig. 2 is the hardware configuration schematic diagram of polarization maintaining optical fibre acousto-optic frequency translation device the first embodiment shown in Figure 1;
Fig. 3 is the module diagram of polarization maintaining optical fibre acousto-optic frequency translation device the second embodiment of the present invention;
Fig. 4 is that collimating apparatus Space Coupling shown in Figure 3 and slow axis are aimed at schematic diagram;
Fig. 5 is the structural representation of regulating block;
Fig. 6 is that collimating apparatus shown in Figure 3 is aimed at schematic diagram by acousto-optical device Space Coupling and slow axis;
Fig. 7 is the light path schematic diagram of polarization maintaining optical fibre acousto-optic frequency translation device shown in Figure 3.
Embodiment
The present invention is described in detail below in conjunction with drawings and embodiments.
Consult Fig. 1, Fig. 1 is the module diagram of polarization maintaining optical fibre acousto-optic frequency translation device the first embodiment of the present invention.In first embodiment of the invention, polarization maintaining optical fibre acousto-optic frequency translation device comprises: the first polarization maintaining optical fibre 11, first collimator 21, acoustooptic switch device 3, the second collimating apparatus 22 and the second polarization maintaining optical fibre 12.In full being single-mode fiber take the first polarization maintaining optical fibre 11 and the second polarization maintaining optical fibre 12 describes as example.
The first polarization maintaining optical fibre 11 connects first collimator 21, the second collimating apparatus 22 connects the second polarization maintaining optical fibre 12, and first collimator 21 and the second collimating apparatus 22 are arranged at respectively at an angle acoustooptic switch device 3 both sides and carry out Space Coupling by acoustooptic switch device 3.
Concrete, in conjunction with Fig. 2, Fig. 2 is the hardware configuration schematic diagram of polarization maintaining optical fibre acousto-optic frequency translation device the first embodiment shown in Figure 1.Acoustooptic switch device 3 comprises driving power 31 and acousto-optical device 32, and acousto-optical device 32 comprises impedance matching network 321, electroacoustics transducer 322 and acousto-optic crsytal 323.First collimator 21 and the second collimating apparatus 22 are arranged at respectively acousto-optic crsytal 323 both sides and carry out Space Coupling by acousto-optic crsytal 323.
Wherein, driving power 31 is by contact conductor 30 matching connection networks 321, and matching network 321 connects electroacoustics transducer 322 by contact conductor 30.Further, driving power 31 output rf power signals are after-applied on electroacoustics transducer 322 through impedance matching network 321, electroacoustics transducer 322 converts rf power signal to ultrasound wave, and ul-trasonic irradiation forms refractive-index grating in acousto-optic crsytal 323 and at acousto-optic crsytal 323.
Further, the light that external light source sends inputs to the slow axis of the first polarization maintaining optical fibre 11 and is exported by first collimator 21 after 11 transmission of the first polarization maintaining optical fibre after rising partially, be incident at a certain angle from the light of first collimator 21 output and Bragg diffraction to occur in the formed refractive-index grating on the acousto-optic crsytal 323 in the acoustooptic switch device 3 produce first-order diffraction light, first-order diffraction light is received by the second collimating apparatus 22, and first-order diffraction light inputs to the slow axis of the second polarization maintaining optical fibre 12 and exports the outside to by the second polarization maintaining optical fibre 12 from the second collimating apparatus 22.Wherein, external light source is generally laser generator, and described laser generator produces laser.In addition, also can substitute this laser generator with led light source, realize diffraction of light, its wavelength that produces light need to satisfy certain condition with the grating constant of refractive-index grating, and no matter be that laser generator or led light source all will be done further processing to its light that produces separately, give unnecessary details no longer one by one herein.
Continue to consult Fig. 2, among Fig. 2, polarization maintaining optical fibre acousto-optic frequency translation device also comprises housing 5, and housing 5 inside are provided with radiator 6.At least first collimator 21, the second collimating apparatus 22 and acousto-optic crsytal 323 are arranged at housing 5 inside, and, acousto-optic crsytal 323 and radiator 6 thermal couplings, wherein, acousto-optic crsytal 323 can directly dispel the heat to pass through radiator 6 by butt radiator 6, perhaps acousto-optic crsytal 323 can by the mode of other thermal coupling,, not make too many restrictions by radiator 6 heat radiations such as cross-ventilated mode herein.Set up radiator 6 and help this polarization maintaining optical fibre acousto-optic frequency translation device internal heat dissipating, improve the reliability and stability of device.
Polarization maintaining optical fibre acousto-optic frequency translation device also comprises for the first governor motion 41 of the output angle of regulating first collimator 21 and is used for regulating receiving angle second governor motion 42 of the second collimating apparatus 22.The first governor motion 41 and the second governor motion 42 all are arranged at housing 5 inside, and first collimator 21 is arranged on the first governor motion 41, and the second collimating apparatus 22 is arranged on the second governor motion 42.
In a concrete Application Example, the first governor motion 41 is identical with the second governor motion 42 structures.Therefore, only the first governor motion 41 is specified herein.
In conjunction with Fig. 5, the first governor motion 41 comprises regulating block 400 and five times regualting frame (not shown).Wherein, regulating block 400 is cylindric, regulating block 400 outer rings are provided with external thread, regulating block 400 centers are provided with at least one collimating apparatus mounting hole 401, running through collimating apparatus mounting hole 401 by screw is fixed in first collimator 21 on the regulating block 400, and five times regualting frame one end is fixed in housing 5, the other end is provided with internal thread, and the threaded by external thread and internal thread is fixed in five times regualting frame with regulating block 400.Certainly, the first governor motion 41 also can be different with the second governor motion 42, as long as the second collimating apparatus 22 can accurately receive the first-order diffraction light by acousto-optic crsytal 323 outgoing, do not make too many restrictions herein.
The polarization maintaining optical fibre acousto-optic frequency translation device of embodiment of the present invention, by the first collimator 21 that will connect the first polarization maintaining optical fibre 11 and the second collimating apparatus 22 and 3 optically-coupled of acoustooptic switch device that is connected the second polarization maintaining optical fibre 12, linearly polarized light by first collimator 21 outputs is incident to acoustooptic switch device 3 generation first-order diffraction light, then the second collimating apparatus 22 receives first-order diffraction light, this first-order diffraction light inputs to the slow axis of the second polarization maintaining optical fibre 12 by the second collimating apparatus 22 and is finally exported by the second polarization maintaining optical fibre 12, can realize the output of linearly polarized light shift frequency, the output polarization state is not vulnerable to temperature, the factor affecting such as external force, it changes less, and output light polarization extinction ratio is higher, and then can be so that system's insertion loss is lower, precision is higher.
Consult Fig. 3, Fig. 3 is the module diagram of polarization maintaining optical fibre acousto-optic frequency translation device the second embodiment of the present invention, and please in conjunction with Fig. 2.The difference of second embodiment of the invention and first embodiment of the invention only is, the polarization maintaining optical fibre acousto-optic frequency translation device of second embodiment of the invention also comprises: polarization detector 100.
The input port of polarization detector 100 connects the output port of the second polarization maintaining optical fibre 12, and the output port of polarization detector 100 connects outer computer terminal 101.
The workflow of second embodiment of the invention briefly introduces as follows:
(1) paired Space Coupling and the slow axis of finishing first collimator 21 and the second collimating apparatus 22 are aimed at.
Concrete, at this moment, do not produce refractive-index grating even do not drive acousto-optical device 32 or drive acousto-optical device 32 yet.Linearly polarized light is inputed to the first polarization maintaining optical fibre 11 input ends, this linearly polarized light is incident to first collimator 21 by the first polarization maintaining optical fibre 11 output terminals and exports through first collimator 21, this linearly polarized light receives and exports to the second polarization maintaining optical fibre 12 input ends by the second collimating apparatus 22 subsequently, by inputed to linear polarization light intensity and the polarization state of polarization detector 100 by the second polarization maintaining optical fibre 12 in terminal 101 observations, the strongest and input polarization state and output light when the linear polarization light intensity (namely enter the linearly polarized light of the first polarization maintaining optical fibre 11 and by the linearly polarized light of the second polarization maintaining optical fibre 12 output) are finished the process of paired Space Coupling and the slow axis aligning of first collimator 21 and the second collimating apparatus 22 when polarization state is consistent, as shown in Figure 4.
Further; first collimator 21; the second collimating apparatus 22 structures are identical; collimating apparatus (21; 22) inside is collimation lens set; outside for protecting metallic sheath; from collimating apparatus (21; 22) light beam of output and protection metallic sheath almost coaxial in; be fixed in the regulating block 400; as shown in Figure 5; regulating block 400 centers are collimating apparatus mounting hole 401; the outer ring is external thread; collimating apparatus (21; 22) protection metallic sheath is arranged on the collimating apparatus mounting hole 401, and runs through this collimating apparatus mounting hole 401 and then with collimating apparatus (21 by screw; 22) be fixed on the regulating block 400.The external thread of regulating block 400 connects with the five times regualting frame internal thread, and collimating apparatus this moment (21,22) roughly is coaxial with five times regualting frame.Fix first collimator 21 and the second collimating apparatus 22 with said structure, namely available five times regualting frame is finished paired Space Coupling and the slow axis aligning of this first collimator 21 and the second collimating apparatus 22.
(2) finish the coupling of first collimator 21 and the second collimating apparatus 22 by acousto-optical device and slow axis is aimed at.
Install and drive acousto-optical device, allow acousto-optical device and first collimator 21 be in same straight line, horizontally rotate first collimator 21(and namely rotate five times regualting frame this moment), allow linearly polarized light be incident to acousto-optic crsytal 323 with Bragg angle, horizontally rotate the second collimating apparatus 22 this moment to receive first-order diffraction light, and, owing to only horizontally rotating process, can not affect the slow axis that has regulated in above-mentioned (1) process aims at, only need adjusting angle to get final product the most by force to receiving first-order diffraction light, can finely tune polarization state by five times regualting frame, to reduce error, as shown in Figure 6.
In the above-mentioned embodiment, after driving acousto-optic crsytal 323 formation refractive-index gratings, being incident to described acousto-optic crsytal 323 rear portion light by the light of first collimator 21 output will continue along the original optical path direction of propagation to propagate, can think that this part light is zero order light, and can produce first-order diffraction light.If acousto-optic crsytal 323 and the second collimating apparatus 22 hypotelorisms, all may reach the second collimating apparatus 22 by the zero order light of acousto-optic crsytal 323 ejaculations and the hot spot of first-order diffraction light, for realizing first-order diffraction light reception preferably, zero order light need to be separated fully with first-order diffraction light, exported by first collimator 21 because of this zero order light again, its angle of divergence is very little, can be considered collimated light, its spot radius d on light path not the distance with propagation distance change, suppose that the distance between the second collimating apparatus 22 and the acousto-optic crsytal 323 is L1, at this moment, zero order light is just separated with first-order diffraction light hot spot separately, as shown in Figure 7:
Wherein, L1 is the distance between acousto-optic crsytal 323 and the second collimating apparatus 22, and d is the radius of hot spot,
Be the angle of departure between first-order diffraction light and the zero order light.
Certainly, realize better, more easily the reception to first-order diffraction light, the distance L between acousto-optic crsytal 323 and the second collimating apparatus 22 only need to satisfy following relation and get final product:
It should be noted that
It doesn't matter with parameters such as spot diameters for value, wherein:
In the above-mentioned formula,
Be the wavelength of the light that is incident to refractive-index grating,
Be hyperacoustic frequency,
For hyperacoustic speed, that is to say
Value only with
,
And
These three parameter correlations are no longer right herein
Concrete derivation principle give unnecessary details one by one.
In a concrete Application Example, the radius d of hot spot is more than or equal to 0.1mm,
Scope is 0.5 °-5 °.Preferably, the radius d of hot spot is more than or equal to 0.25mm,
Scope is 1 °-3 °.
In a concrete Application Example, acousto-optic crsytal 323 is tellurium oxide crystal, GaP crystal, GeAsSe glass, Crystals of Lead Molybdate, lithium columbate crystal, quartz crystal, melts the acousto-materials such as quartz or dense flint glass.
The polarization maintaining optical fibre acousto-optic frequency translation device of embodiment of the present invention can be realized the output of linearly polarized light shift frequency, and the output polarization state is not vulnerable to the factor affecting such as temperature, external force, and it changes less, and system's insertion loss is lower.In addition, set up polarization detector 100, help the paired Space Coupling of first collimator 21 and the second collimating apparatus 22 and slow axis to aim at, use simple, convenient.
Above-mentioned embodiment has following advantage:
(1) can realize the output of linearly polarized light shift frequency, output light polarization extinction ratio is higher, and then can be so that system's insertion loss is lower, precision is higher;
(2) use is simple, convenient;
(3) application is extensive, can be applicable to such as laser windfinding radar, fibre optic hydrophone etc.
Below only be embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes instructions of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (10)
1. a polarization maintaining optical fibre acousto-optic frequency translation device is characterized in that, comprising:
The first polarization maintaining optical fibre, first collimator, acoustooptic switch device, the second collimating apparatus and the second polarization maintaining optical fibre;
Described the first polarization maintaining optical fibre connects described first collimator, described the second collimating apparatus connects described the second polarization maintaining optical fibre, and described first collimator and described the second collimating apparatus are arranged at respectively at an angle described acoustooptic switch device both sides and carry out Space Coupling by described acoustooptic switch device;
Wherein, the light that external light source sends inputs to the slow axis of described the first polarization maintaining optical fibre and is exported by described first collimator after described the first polarization maintaining optical fibre transmission after rising partially, described light from described first collimator output is incident to described acoustooptic switch device generation Bragg diffraction generation first-order diffraction light at a certain angle, described first-order diffraction light is received by described the second collimating apparatus, and described first-order diffraction light inputs to the slow axis of described the second polarization maintaining optical fibre and exports the outside to by described the second polarization maintaining optical fibre from described the second collimating apparatus.
2. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 1 is characterized in that,
Described polarization maintaining optical fibre acousto-optic frequency translation device comprises polarization detector, and the input port of described polarization detector connects the output port of described the second polarization maintaining optical fibre.
3. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 2 is characterized in that,
Described acoustooptic switch device comprises driving power and acousto-optical device;
Described acousto-optical device comprises impedance matching network, electroacoustics transducer and acousto-optic crsytal;
Wherein, described driving power output rf power signal is after-applied on described electroacoustics transducer through described impedance matching network, described electroacoustics transducer converts rf power signal to ultrasound wave, and ul-trasonic irradiation forms refractive-index grating in described acousto-optic crsytal and at described acousto-optic crsytal;
Described first collimator and described the second collimating apparatus are arranged at respectively described acousto-optic crsytal both sides and carry out Space Coupling by described acousto-optic crsytal.
4. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 2 is characterized in that,
Described polarization maintaining optical fibre acousto-optic frequency translation device comprises housing, and described enclosure interior is provided with radiator;
At least described first collimator, described the second collimating apparatus and described acousto-optic crsytal are arranged at described enclosure interior, and, described acousto-optic crsytal and described radiator thermal coupling.
5. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 4 is characterized in that,
Described polarization maintaining optical fibre acousto-optic frequency translation device comprises the first governor motion and the second governor motion;
Described the first governor motion and described the second governor motion all are arranged at described enclosure interior, and described first collimator is arranged on described the first governor motion, and described the second collimating apparatus is arranged on described the second governor motion;
Wherein, described the first governor motion is for the output angle of regulating described first collimator, and described the second governor motion is used for regulating the receiving angle of described the second collimating apparatus.
6. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 5 is characterized in that,
Described the first governor motion is identical with described the second governor motion structure;
Described the first governor motion comprises regulating block and five times regualting frame;
Wherein, described regulating block is cylindric, described regulating block outer ring is provided with external thread, described regulating block center is provided with at least one mounting hole, running through described mounting hole by screw is fixed in described first collimator on the described regulating block, and described five times regualting frame one end is fixed in described housing, the other end is provided with internal thread, and the threaded by described external thread and described internal thread is fixed in described five times regualting frame with described regulating block.
7. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 5 is characterized in that,
The hot spot of described first-order diffraction light arrives described the second collimating apparatus and is received by described the second collimating apparatus;
At least described the second collimating apparatus and described acousto-optic crsytal are separated by a distance and satisfy following relation:
Wherein, L is the distance between described the second collimating apparatus and the described acousto-optic crsytal, and d is the radius of hot spot,
For first-order diffraction light and described light are incident to behind the described acousto-optic crsytal along the angle of departure between the original optical path direction of propagation.
8. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 7 is characterized in that,
The acceptance angle of described the second collimating apparatus is less than the angle of departure of described zero order light and first-order diffraction light
9. according to claim 7 or 8 described polarization maintaining optical fibre acousto-optic frequency translation devices, it is characterized in that,
The radius d of described hot spot is more than or equal to 0.1mm, and is described
Scope is 0.5 °-5 °.
10. polarization maintaining optical fibre acousto-optic frequency translation device according to claim 1 is characterized in that,
Described the first polarization maintaining optical fibre and described the second polarization maintaining optical fibre are single-mode fiber;
Described external light source is laser generator.
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| CN106094266A (en) * | 2016-08-26 | 2016-11-09 | 中国电子科技集团公司第二十六研究所 | Multi-wavelength optical fiber acousto-optic frequency shifters |
| CN106444100A (en) * | 2016-12-16 | 2017-02-22 | 中国电子科技集团公司第二十六研究所 | Integration optical fiber acousto-optic device |
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| 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 |
| CN108803092A (en) * | 2018-06-27 | 2018-11-13 | 清华大学 | A kind of adjustable acousto-optic frequency translation system and method for shift frequency frequency |
| CN110132232A (en) * | 2019-06-21 | 2019-08-16 | 珠海任驰光电科技有限公司 | Static leveling device and method based on the weak value amplification of quantum |
| CN110132232B (en) * | 2019-06-21 | 2023-07-25 | 珠海任驰光电科技有限公司 | Static leveling device and method based on quantum weak value amplification |
| CN112162447A (en) * | 2020-09-25 | 2021-01-01 | 武汉中科锐择光电科技有限公司 | Wavelength division multiplexing type dual-beam acousto-optic modulation system and method |
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