CN203069821U - Polarization maintaining fiber acousto-optic frequency shifting device - Google Patents
Polarization maintaining fiber acousto-optic frequency shifting device Download PDFInfo
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- CN203069821U CN203069821U CN 201320097177 CN201320097177U CN203069821U CN 203069821 U CN203069821 U CN 203069821U CN 201320097177 CN201320097177 CN 201320097177 CN 201320097177 U CN201320097177 U CN 201320097177U CN 203069821 U CN203069821 U CN 203069821U
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Abstract
The utility model discloses a polarization maintaining fiber acousto-optic frequency shifting device, comprising a first polarization maintaining fiber, a first collimator, an acousto-optic switching device, a second collimator, and a second polarization maintaining fiber; wherein the first polarization maintaining fiber is connected with the first collimator, the second collimator is connected with the second polarization maintaining fiber, the first collimator and the second collimator are respectively arranged at two sides of the acousto-optic switching device at an certain angle and perform space coupling through the acousto-optic switching device; a light is inputted to a slow axis of the first polarization maintaining fiber after being polarized, then the light is outputted by the first collimator after being transmitted by the first polarization maintaining fiber, the light outputted from the first collimator is incident to the acousto-optic switching device at an certain angle to cause Bragg diffraction, so as to generate a first-order diffracted light, then the first-order diffracted light is received by the second collimator, and the first-order diffracted light is inputted to a slow axis of the second polarization maintaining fiber from the second collimator and then is outputted by the second polarization maintaining fiber. The polarization maintaining fiber acousto-optic frequency shifting device of the utility model can realize frequency-shift output of a linearly polarized light, and the output light has a higher polarization extinction ratio, so that a system has a lower insertion loss and a higher precision.
Description
Technical field
The utility model relates to acousto-optic frequency shift technique field, particularly relates to a kind of polarization maintaining optical fibre acousto-optic shift frequency device.
Background technology
The optical fiber acousto-optic frequency shifters is owing to insert numerous advantages such as loss is low, the response time fast, compact conformation, no moving-member, extensive application in 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 handled, to reduce the treatment capacity of system, improve the processing accuracy of system.
Simultaneously, carry out the system that light signal is handled with linearly polarized light, can be polarized processing again to the output light of handling through shift frequency in the system, general single mode fiber acousto-optic frequency shifters output polarization state is unsettled, it is very big influenced by temperature, external force etc., therefore export light and pass through and handle the back light intensity partially and can change at any time, and it is relatively poor and then may influence 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 utility model mainly solves provides a kind of polarization maintaining optical fibre acousto-optic shift frequency device, can realize the output of linearly polarized light shift frequency, and output light polarization extinction ratio is higher, and then the system that can make inserts, and loss is lower, precision is higher.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of polarization maintaining optical fibre acousto-optic shift frequency device is provided, comprises: first polarization maintaining optical fibre, first collimating apparatus, acoustooptic switch device, second collimating apparatus and second polarization maintaining optical fibre; First polarization maintaining optical fibre connects first collimating apparatus, and second collimating apparatus connects second polarization maintaining optical fibre, and first collimating apparatus and second collimating apparatus are arranged at acoustooptic switch device both sides at an angle respectively and carry out the space coupling by the acoustooptic switch device; Wherein, the light that external light source sends inputs to the slow axis of first polarization maintaining optical fibre and is exported by first collimating apparatus after the transmission of first polarization maintaining optical fibre after rising partially, light from the output of first collimating apparatus 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 second collimating apparatus, and first-order diffraction light inputs to the slow axis of second polarization maintaining optical fibre and exports the outside to by second polarization maintaining optical fibre from second collimating apparatus.
Wherein, polarization maintaining optical fibre acousto-optic shift frequency device comprises polarization detector, and the input port of polarization detector connects the output port of 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 ultrasound wave acts on acousto-optic crsytal and forms refractive-index grating at acousto-optic crsytal; First collimating apparatus and second collimating apparatus are arranged at the acousto-optic crsytal both sides respectively and carry out the space coupling by acousto-optic crsytal.
Wherein, polarization maintaining optical fibre acousto-optic shift frequency device comprises housing, and enclosure interior is provided with radiator; At least the first collimating apparatus, 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 shift frequency device comprises first governor motion and second governor motion; First governor motion and second governor motion all are arranged at enclosure interior, and first collimating apparatus is arranged on first governor motion, and second collimating apparatus is arranged on second governor motion; Wherein, first governor motion is used for regulating the output angle of first collimating apparatus, and second governor motion is used for regulating the receiving angle of second collimating apparatus.
Wherein, first governor motion is identical with the second governor motion structure; 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 collimating apparatus 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 second collimating apparatus and is received by 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 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 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, first polarization maintaining optical fibre and second polarization maintaining optical fibre are single-mode fiber; External light source is laser generator.
The beneficial effects of the utility model are: the situation that is different from prior art, the utility model polarization maintaining optical fibre acousto-optic shift frequency device, by first collimating apparatus that will connect first polarization maintaining optical fibre and second collimating apparatus that is connected second polarization maintaining optical fibre and the optically-coupled of acoustooptic switch device, linearly polarized light by the output of first collimating apparatus is incident to acoustooptic switch device generation first-order diffraction light, second collimating apparatus receives first-order diffraction light then, this first-order diffraction light inputs to the slow axis of second polarization maintaining optical fibre by second collimating apparatus and is finally exported by second polarization maintaining optical fibre, can realize the output of linearly polarized light shift frequency, the output polarization state is not vulnerable to temperature, factor affecting such as external force, it changes less, output light polarization extinction ratio is higher, and then can make that system's insertion loss is lower, precision is higher.
Description of drawings
Fig. 1 is the module diagram of the utility model polarization maintaining optical fibre acousto-optic shift frequency device first embodiment;
Fig. 2 is the hardware configuration synoptic diagram of polarization maintaining optical fibre acousto-optic shift frequency device first embodiment shown in Figure 1;
Fig. 3 is the module diagram of the utility model polarization maintaining optical fibre acousto-optic shift frequency device second embodiment;
Fig. 4 is that the coupling of collimating apparatus shown in Figure 3 space and slow axis are aimed at synoptic diagram;
Fig. 5 is the structural representation of regulating block;
Fig. 6 is that collimating apparatus shown in Figure 3 is aimed at synoptic diagram by the coupling of acousto-optical device space and slow axis;
Fig. 7 is the light path synoptic diagram of polarization maintaining optical fibre acousto-optic shift frequency device shown in Figure 3.
Embodiment
Below in conjunction with drawings and embodiments the utility model is elaborated.
Consult Fig. 1, Fig. 1 is the module diagram of the utility model polarization maintaining optical fibre acousto-optic shift frequency device first embodiment.In the utility model first embodiment, polarization maintaining optical fibre acousto-optic shift frequency device comprises: first polarization maintaining optical fibre 11, first collimating apparatus 21, acoustooptic switch device 3, second collimating apparatus 22 and second polarization maintaining optical fibre 12.Being single-mode fiber with first polarization maintaining optical fibre 11 and second polarization maintaining optical fibre 12 in full is that example describes.
First polarization maintaining optical fibre 11 connects first collimating apparatus 21, second collimating apparatus 22 connects second polarization maintaining optical fibre, 12, the first collimating apparatuss 21 and second collimating apparatus 22 is arranged at acoustooptic switch device 3 both sides at an angle respectively and carries out the space coupling by acoustooptic switch device 3.
Concrete, in conjunction with Fig. 2, Fig. 2 is the hardware configuration synoptic diagram of polarization maintaining optical fibre acousto-optic shift frequency device 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 collimating apparatus 21 and second collimating apparatus 22 are arranged at acousto-optic crsytal 323 both sides respectively and carry out the space coupling by acousto-optic crsytal 323.
Wherein, driving power 31 connects matching network 321 by contact conductor 30, 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 ultrasound wave acts on acousto-optic crsytal 323 and forms refractive-index grating at acousto-optic crsytal 323.
Further, the light that external light source sends inputs to the slow axis of first polarization maintaining optical fibre 11 and is exported by first collimating apparatus 21 after 11 transmission of first polarization maintaining optical fibre after rising partially, be incident at a certain angle from the light of first collimating apparatus 21 output and Bragg diffraction to take place 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 second collimating apparatus 22, and first-order diffraction light inputs to the slow axis of second polarization maintaining optical fibre 12 and exports the outside to by second polarization maintaining optical fibre 12 from 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 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 shift frequency device also comprises housing 5, and housing 5 inside are provided with radiator 6.At least the first collimating apparatus 21, 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, not make too many restrictions by radiator 6 heat radiations as cross-ventilated mode by the mode of other thermal coupling herein.Set up radiator 6 and help this polarization maintaining optical fibre acousto-optic shift frequency device internal heat dissipating, improve the reliability and stability of device.
Polarization maintaining optical fibre acousto-optic shift frequency device also comprises for first governor motion 41 of the output angle of regulating first collimating apparatus 21 and is used for regulating receiving angle second governor motion 42 of second collimating apparatus 22.First governor motion 41 and second governor motion 42 all are arranged at housing 5 inside, and first collimating apparatus 21 is arranged on first governor motion 41, and second collimating apparatus 22 is arranged on second governor motion 42.
In a concrete Application Example, first governor motion 41 is identical with second governor motion, 42 structures.Therefore, only first governor motion 41 is specified herein.
In conjunction with Fig. 5, 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 collimating apparatus 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, first governor motion 41 also can be different with second governor motion 42, as long as 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 shift frequency device of the utility model embodiment, by first collimating apparatus 21 that will connect first polarization maintaining optical fibre 11 and second collimating apparatus 22 and 3 optically-coupled of acoustooptic switch device that is connected second polarization maintaining optical fibre 12, linearly polarized light by 21 outputs of first collimating apparatus is incident to acoustooptic switch device 3 generation first-order diffraction light, second collimating apparatus 22 receives first-order diffraction light then, this first-order diffraction light inputs to the slow axis of second polarization maintaining optical fibre 12 by second collimating apparatus 22 and is finally exported by 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, factor affecting such as external force, it changes less, and output light polarization extinction ratio is higher, and then can make that system's insertion loss is lower, precision is higher.
Consult Fig. 3, Fig. 3 is the module diagram of the utility model polarization maintaining optical fibre acousto-optic shift frequency device second embodiment, and please in conjunction with Fig. 2.The difference of the utility model second embodiment and the utility model first embodiment only is that the polarization maintaining optical fibre acousto-optic shift frequency device of the utility model second embodiment also comprises: polarization detector 100.
The input port of polarization detector 100 connects the output port of second polarization maintaining optical fibre 12, and the output port of polarization detector 100 connects outer computer terminal 101.
The workflow of the utility model second embodiment briefly introduces as follows:
(1) coupling of paired space and the slow axis of finishing first collimating apparatus 21 and second collimating apparatus 22 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 first polarization maintaining optical fibre, 11 input ends, this linearly polarized light is incident to first collimating apparatus 21 by first polarization maintaining optical fibre, 11 output terminals and exports through first collimating apparatus 21, this linearly polarized light receives and exports to second polarization maintaining optical fibre, 12 input ends by second collimating apparatus 22 subsequently, by inputed to linear polarization light intensity and the polarization state of polarization detector 100 by 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 first polarization maintaining optical fibre 11 and by the linearly polarized light of second polarization maintaining optical fibre 12 output) are finished first collimating apparatus 21 and second collimating apparatus 22 when polarization state is consistent paired space is coupled and the process of slow axis aligning, as shown in Figure 4.
Further; first collimating apparatus 21; 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 metal is sheathed to be placed 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 collimating apparatus 21 and second collimating apparatus 22 with said structure, namely available five times regualting frame is finished the coupling of paired space and the slow axis aligning of this first collimating apparatus 21 and second collimating apparatus 22.
(2) finish the coupling of first collimating apparatus 21 and 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 collimating apparatus 21 be in same straight line, horizontally rotate the first collimating apparatus 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 second collimating apparatus 22 this moment to receive first-order diffraction light, and, owing to only horizontally rotate process, can not influence the slow axis that has regulated in above-mentioned (1) process aims at, only need adjusting angle to receiving the strongest the getting final product of 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 a part of light in described acousto-optic crsytal 323 backs by the light of first collimating apparatus 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 second collimating apparatus, 22 hypotelorisms, all may reach 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 be separated fully with first-order diffraction light, exported by first collimating apparatus 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 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 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 the reception to first-order diffraction light better, more easily, the distance L between acousto-optic crsytal 323 and second collimating apparatus 22 only need 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 frequency of ultrasonic,
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, gallium phosphide crystal, germanium arsenic selenium glass, lead molybdate crystal, lithium columbate crystal, quartz crystal, melts acousto-materials such as quartz or dense flint glass.
The polarization maintaining optical fibre acousto-optic shift frequency device of the utility model embodiment can be realized the output of linearly polarized light shift frequency, and the output polarization state is not vulnerable to 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 coupling of paired space and the slow axis of first collimating apparatus 21 and second collimating apparatus 22 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 the system that can make inserts, and loss is lower, precision is higher;
(2) use is simple, convenient;
(3) application is extensive, can be applicable to as laser windfinding radar, fibre optic hydrophone etc.
It below only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model instructions 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 utility model.
Claims (10)
1. a polarization maintaining optical fibre acousto-optic shift frequency device is characterized in that, comprising:
First polarization maintaining optical fibre, first collimating apparatus, acoustooptic switch device, second collimating apparatus and second polarization maintaining optical fibre;
Described first polarization maintaining optical fibre connects described first collimating apparatus, described second collimating apparatus connects described second polarization maintaining optical fibre, and described first collimating apparatus and described second collimating apparatus are arranged at described acoustooptic switch device both sides at an angle respectively and carry out the space coupling by described acoustooptic switch device;
Wherein, the light that external light source sends inputs to the slow axis of described first polarization maintaining optical fibre and is exported by described first collimating apparatus after described first polarization maintaining optical fibre transmission after rising partially, described light from described first collimating apparatus 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 second collimating apparatus, and described first-order diffraction light inputs to the slow axis of described second polarization maintaining optical fibre and exports the outside to by described second polarization maintaining optical fibre from described second collimating apparatus.
2. polarization maintaining optical fibre acousto-optic shift frequency device according to claim 1 is characterized in that,
Described polarization maintaining optical fibre acousto-optic shift frequency device comprises polarization detector, and the input port of described polarization detector connects the output port of described second polarization maintaining optical fibre.
3. polarization maintaining optical fibre acousto-optic shift frequency 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 ultrasound wave acts on described acousto-optic crsytal and forms refractive-index grating at described acousto-optic crsytal;
Described first collimating apparatus and described second collimating apparatus are arranged at described acousto-optic crsytal both sides respectively and carry out the space coupling by described acousto-optic crsytal.
4. polarization maintaining optical fibre acousto-optic shift frequency device according to claim 2 is characterized in that,
Described polarization maintaining optical fibre acousto-optic shift frequency device comprises housing, and described enclosure interior is provided with radiator;
At least described first collimating apparatus, described 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 shift frequency device according to claim 4 is characterized in that,
Described polarization maintaining optical fibre acousto-optic shift frequency device comprises first governor motion and second governor motion;
Described first governor motion and described second governor motion all are arranged at described enclosure interior, and described first collimating apparatus is arranged on described first governor motion, and described second collimating apparatus is arranged on described second governor motion;
Wherein, described first governor motion is used for regulating the output angle of described first collimating apparatus, and described second governor motion is used for regulating the receiving angle of described second collimating apparatus.
6. polarization maintaining optical fibre acousto-optic shift frequency device according to claim 5 is characterized in that,
Described first governor motion is identical with the described second governor motion structure;
Described 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 collimating apparatus 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 shift frequency device according to claim 5 is characterized in that,
The hot spot of described first-order diffraction light arrives described second collimating apparatus and is received by described second collimating apparatus;
At least described second collimating apparatus and described acousto-optic crsytal are separated by a distance and satisfy following relation:
Wherein, L is the distance between described 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 shift frequency device according to claim 7 is characterized in that,
The acceptance angle of described 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 shift frequency 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 shift frequency device according to claim 1 is characterized in that,
Described first polarization maintaining optical fibre and described second polarization maintaining optical fibre are single-mode fiber;
Described external light source is laser generator.
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| CN 201320097177 CN203069821U (en) | 2013-03-04 | 2013-03-04 | Polarization maintaining fiber acousto-optic frequency shifting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076654A (en) * | 2013-03-04 | 2013-05-01 | 中国电子科技集团公司第二十六研究所 | Polarization maintaining optical fiber acousto-optic frequency shift device |
| CN108983445A (en) * | 2018-08-30 | 2018-12-11 | 南开大学 | A kind of fiber acouso optic device stress adjustable support and its system and installation method |
| CN113900187A (en) * | 2021-10-13 | 2022-01-07 | 中国电子科技集团公司第三十四研究所 | Fiber polarization control device and method based on Lyot effect |
-
2013
- 2013-03-04 CN CN 201320097177 patent/CN203069821U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076654A (en) * | 2013-03-04 | 2013-05-01 | 中国电子科技集团公司第二十六研究所 | Polarization maintaining optical fiber acousto-optic frequency shift device |
| CN108983445A (en) * | 2018-08-30 | 2018-12-11 | 南开大学 | A kind of fiber acouso optic device stress adjustable support and its system and installation method |
| CN108983445B (en) * | 2018-08-30 | 2023-10-31 | 南开大学 | Stress-adjustable bracket for optical fiber acousto-optic device, system and installation method thereof |
| CN113900187A (en) * | 2021-10-13 | 2022-01-07 | 中国电子科技集团公司第三十四研究所 | Fiber polarization control device and method based on Lyot effect |
| CN113900187B (en) * | 2021-10-13 | 2023-08-29 | 中国电子科技集团公司第三十四研究所 | Optical fiber polarization control device and method based on Coriolis effect |
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