CN106569357A - Multi-freedom-degree spectral filter capable of compensating chromatic dispersion of polarization mode - Google Patents

Multi-freedom-degree spectral filter capable of compensating chromatic dispersion of polarization mode Download PDF

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Publication number
CN106569357A
CN106569357A CN201610982537.1A CN201610982537A CN106569357A CN 106569357 A CN106569357 A CN 106569357A CN 201610982537 A CN201610982537 A CN 201610982537A CN 106569357 A CN106569357 A CN 106569357A
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optical fiber
polarization
polarization maintaining
optical fibre
freedom
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CN106569357B (en
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李娆
范薇
乔治
黄灿鸿
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Shanghai Institute of Optics and Fine Mechanics of CAS
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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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • 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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • 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 
    • G02F1/13—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 liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes

Abstract

The invention provides a multi-freedom-degree spectral filter capable of compensating chromatic dispersion of a polarization mode. The filter comprises a first optical fiber collimator, a thin-film polarizer, a phase type liquid crystal, a second optical fiber collimator, an additional polarization maintaining fiber, a polarization maintaining optical fiber with an optical axis rotating and an optical fiber analyzer. The thin-film polarizer is rotated and the voltage of the phase type liquid crystal and the length of the additional polarization maintaining fiber are adjusted, thereby realizing decoupling adjustment on the modulation depth, the peak wavelength and the free spectral range of the filter. The multi-freedom-degree spectral filter has height controllability. The multi-freedom-degree spectral filter can be used for compensating an amplitude and frequency modulation effect caused by chromatic dispersion of a fiber polarization mode when wide-spectrum light in a high-power laser system is transmitted in a polarization-maintaining device and a polarization-maintaining fiber. When the multi-freedom-degree spectral filter is in use, according to a time-domain waveform monitored by an oscilloscope, a controller is controlled based on a computer feedback to adjust a parameter of a compensation unit, thereby realizing automatic real-time compensation of chromatic dispersion of a polarization mode.

Description

A kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion
Technical field
The present invention relates to spectral filtering device field, specifically a kind of multiple degrees of freedom spectrum filter that can compensate for polarization mode dispersion Ripple device.
Background technology
In laser field, particularly high power laser light field, in order to control the generation of nonlinear effect and burnt to realize The even cunning of spot and the Smoothing by Spectral Dispersion technology that adopts, need that single-frequency laser is carried out into video stretching using phase-modulator.However, Polarization mode dispersion is (including Differential Group Delay and low polarization extinction present in the inclined device of guarantor and polarization maintaining optical fibre in laser system Than), polarization filtering effect can be produced, so that spectral component transmissivity different in the spectrum after broadening is uneven, reach During output end, the frequency modulating section that can cause laser is converted to amplitude modulation(PAM), and this phenomenon is referred to as in superpower laser Amplitude-frequency mudulation effect.Amplitude-frequency modulation not only results in photosignal waveform distortion, can more seriously increase the damage of optical element Cold danger simultaneously reduces the validity of Physical Experiment.It is therefore desirable to compensating to it.In high power laser system, polarization mode Impact of the dispersion to pulse is with time change at random.This is due to when light pulse is transmitted in polarization maintaining optical fibre, when guarantor's polarisation Fine surrounding environment change (temperature change or by ambient pressure), can produce complicated and random impact, this meeting to transmission pulse The amplitude-frequency modulation for causing reproduced pulse also shows as time-varying characteristics, therefore is difficult to compensate it.Additionally, according to high power Laser system tests the difference of demand, and the length of polarization maintaining optical fibre also can be adjusted therewith in front end system, and this can cause polarization filtering The free spectral range of the filter function that effect is produced produces change, so as to the impact to light pulse changes.
At present existing Polarization Mode Dispersion Compensation mainly uses different types of Polarization Controller, such as：Two/ Combination, liquid crystal of one wave plate and quarter-wave plate etc..But the combination flexible adjustment of 1/2nd wave plates and quarter-wave plate Degree is relatively low, free spectral range not malleable；And liquid crystal system control system is complex, and need special according to use demand Liquid crystal device is designed and produced, it is relatively costly.Another effectively compensation way is, by two sections of isometric polarization maintaining optical fibre optical axis rotations Welding after turning 90 °, although the Differential Group Delay of this method energy compensated optical fiber, cannot compensate the impact that random phase shift is caused, And flexibility ratio is not high.The peak wavelength and modulation depth that system filter function can mainly be caused in view of polarization mode dispersion is at any time Between change；And the polarization maintaining optical fibre length used in laser system is different, the Free Spectral Range of its filter function can be caused again Change.Therefore, design it is a set of can the multiple degrees of freedom Polarization Mode Dispersion Compensation Systems of Automatic adjusument be necessary.
The content of the invention
Present invention aim to overcome that above-mentioned the deficiencies in the prior art, there is provided a kind of to can compensate for the how free of polarization mode dispersion Degree spectral filter, for solving existing polarization film dispersion compensating device free spectral range adjustment difficulty, adaptive control system Complicated problem.Specifically, it is an object of the invention to provide a kind of multiple degrees of freedom spectral filter, its peak wavelength, modulation Depth and Free Spectral Range can be adjusted as needed.Invention further aims to provide a devcie and method, described Method can be by providing a kind of closed-loop control available multiple degrees of freedom spectral filter to the polarization in polarizer and polarization maintaining optical fibre Mode dispersion carries out real-Time Compensation, can carry out real-time feedback control to the compensation device by monitoring pulse temporal waveform, with The amplitude-frequency mudulation effect that polarization mode dispersion causes in suppression system.
The technology used in the present invention is as follows：
A kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion, including the first optical fiber collimator, installed in rotation Phase type liquid crystal, the second optical fiber collimator, the additional guarantor's polarisation for turn the film polarizer in adjustment frame, being furnished with liquid-crystal controller The fine, polarization maintaining optical fibre of optical axis rotation and optical fiber analyzer；The tail optical fiber of first optical fiber collimator is connected with input optical fibre, Jing After light film polarizer described in after the collimation output of one optical fiber collimator, become linearly polarized light, it is inclined by rotating the film Shake piece, and phase type is incided at an angle in the polarization direction and the liquid crystal optic axis of the phase type liquid crystal for making the linearly polarized light It is parallel with liquid crystal optic axis direction and vertical after the phase type liquid crystal of alternating voltage is loaded by liquid-crystal controller on liquid crystal Two polarized components produce certain phase delay, then Jing the second optical fiber collimator coupled into optical fibres, the tail of the second optical fiber collimator Fine to be connected with additional polarization maintaining optical fibre, the polarization maintaining optical fibre that the another port of additional polarization maintaining optical fibre rotates with optical axis is connected, optical axis rotation The output end of polarization maintaining optical fibre be connected with the input of optical fiber analyzer, Jing after the analyzing of optical fiber analyzer, from optical fiber analyzer Output end export and into output optical fibre continue transmit.
By rotating the film polarizer, the voltage of the phase type liquid crystal and the length of the additional polarization maintaining optical fibre are adjusted Degree, the decoupling that can respectively realize the modulation depth to wave filter, peak wavelength and Free Spectral Range is adjusted.
The tail optical fiber of second optical fiber collimator need to adopt polarization maintaining optical fibre.
The normal direction of the film polarizer is parallel with direction of beam propagation.
The length of the additional polarization maintaining optical fibre is selected according to the actual requirements.
The polarization maintaining optical fibre of the optical axis rotation elects shaft angle degree 45 ° as most preferably.
Described liquid-crystal controller and described rotation adjustment frame is connected respectively with computer, and the computer is connected with oscillograph, To realize the real-Time Compensation to polarization mode dispersion, so as to realize the Remote closed loop control to the modulation of pulse amplitude-frequency.
The features and advantages of the invention：
Instant invention overcomes existing compensation method is adjusted, the free degree is few, and the complex shortcoming of control system is achievable right The decoupling of filter peak wavelength, modulation depth and Free Spectral Range is adjusted, and with the characteristic compatible with fibre system. Wherein, the tuning of peak wavelength is identical with the voltage transformation qualitative tendency of liquid crystal phase place, and change and the wave plate of modulation depth rotate Angle is in simple parabolic relation, therefore easily realizes the highly controllable regulation to wave filter.Due to its high controllability and Flexibility, described multiple degrees of freedom spectral filter can be used for being drawn by polarizer and polarization maintaining optical fibre in device of high power laser The polarization mode dispersion for rising carries out real-Time Compensation, can carry out Real-time Feedback to the compensation device by monitoring pulse temporal waveform Control, so as to the amplitude-frequency mudulation effect that polarization mode dispersion in suppression system causes.
Description of the drawings
Fig. 1 is the structural representation of the multiple degrees of freedom spectral filter that the present invention can compensate for polarization mode dispersion.
In figure, the optical fiber collimators of 1- first, 2- film polarizers, 3- phase type liquid crystal, the optical fiber collimators of 4- second, 5- are attached Plus polarization maintaining optical fibre, the 7- optical fiber analyzers of polarization maintaining optical fibre, 6- optical axises rotation.
Fig. 2 is change schematic diagram of the filters modulate depth with the film polarizer anglec of rotation.Fig. 2 (a) is filter function With the change that film polarizer rotates；Fig. 2 (b) is the relation curve of modulation depth and the film polarizer anglec of rotation.
Fig. 3 is change schematic diagram of the filter peak wavelength with liquid crystal voltage.Fig. 3 (a) is peak wavelength and peak power Change curve；Fig. 3 (b) is liquid crystal retardation performance with alive change curve.
Fig. 4 is the change schematic diagram that wave filter Free Spectral Range changes with additional polarization maintaining optical fibre length.Fig. 4 (a) is attached Plus polarization maintaining optical fibre length is 0m；It is 1.5m that Fig. 4 (b) is additional polarization maintaining optical fibre length；Fig. 4 (c) is for additional polarization maintaining optical fibre length 3m；It is 5m that Fig. 4 (d) is additional polarization maintaining optical fibre length.
Fig. 5 is the structural representation of another embodiment of the multiple degrees of freedom spectral filter that the present invention can compensate for polarization mode dispersion Figure.In figure, 8- computers, 9- oscillographs.
Fig. 6 is the effect that the amplitude-frequency modulation caused to high power laser system polarization mode dispersion using the wave filter is compensated Fruit is schemed.Light pulse signal when not compensating that Fig. 6 (a) is collected for oscillograph；Fig. 6 (b) passes through this for what oscillograph was collected Light pulse signal after the compensation device of invention；Fig. 6 (c) is to carry out pulse in 3 hours after automatic feedback compensation using the present invention The situation of change of amplitude-frequency modulation.
Specific embodiment
It is described in further detail with example below in conjunction with the accompanying drawings.
Embodiment 1：As shown in Figure 1, a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion, including center The optical fiber collimator 1, transmission peak wavelength of wavelength 1053nm is the film polarizer 2, clear aperature of 550～1500nmThoroughly The half-wave phase type liquid crystal 3, tail optical fiber of a length of 1050～1700nm of ejected wave for 1053nm polarization maintaining optical fibres the second optical fiber collimator 4, Transmission wavelength is that 1053nm is protected partially for the polarization maintaining optical fibre 6, tail optical fiber that the additional polarization maintaining optical fibre 5, optical axis of 1053nm rotates welding after 45 ° The optical fiber analyzer 7 of optical fiber.
When the GVD and loss that do not consider optical fiber introducing, the system filter function of the wave filter can use Jones Matrix is expressed as
Hout(f)=MILP·MCON·MPM-R-PM·MCON·MPM·MLC·MP·Hin(f),
H in formulain(f) be input light spectral function, MPFor film polarizer transmission matrix, MLCFor liquid crystal transmission matrix, MPM For additional polarization maintaining optical fibre transmission matrix, MCONFor flange transmission matrix, MPM-R-PMFor 45 ° of polarization maintaining optical fibre transmission matrixs of rotating shaft, MILP For the transmission matrix of optical fiber analyzer.The transmission matrix form of each optical element is as follows：ρ For the line polarisation polarization direction Jing after the polarizer and the angle of liquid crystal optic axis；
η is that the opposite polarization that liquid crystal is introduced to slow axial light (setting fast axle lossless) is damaged Consumption,For the relative phase shift that the optical signal that liquid crystal is transmitted to slow axis is introduced (relative to fast axle)；
L is polarization maintaining optical fibre length, and ε is polarization maintaining optical fibre polarization mode dispersion constant, generally protects polarisation Fibre is 1.5～2ps/m,For the random phase shift that polarization maintaining optical fibre is introduced；
θcIt is relevant with flange extinction ratio；
l1,l2Respectively turn Two sections of polarization maintaining optical fibre length of axle docking；
l3For film polarizer injection end polarization maintaining optical fibre length.
Using thin described in the light Jing that spectrum width is exported for the fluorescence source of 40nm as injection light, the optical fiber collimators of Jing first collimation After film polarizer, become linearly polarized light, phase type liquid crystal is incided at an angle in the line polarisation polarization direction with liquid crystal optic axis On, Jing after the phase type liquid crystal for adding alternating voltage, two polarized components parallel and vertical with liquid crystal optic axis direction produce certain Phase delay, then Jing the second optical fiber collimator coupled into optical fibres, the tail optical fiber of the second optical fiber collimator is connected with additional polarization maintaining optical fibre, The polarization maintaining optical fibre that the another port of additional polarization maintaining optical fibre rotates with optical axis is connected, the output end and light of the polarization maintaining optical fibre of optical axis rotation The input of fine analyzer is connected, and Jing after the analyzing of optical fiber analyzer, output is exported and entered from the output end of optical fiber analyzer Optical fiber continues to transmit.
Investigate the modulation depth decoupling tuning capability of wave filter.Liquid crystal is not added with voltage, and additional polarization maintaining optical fibre length is 3m.If Put film polarizer adjustment frame initial angle and be directed at 1 ° of graduation mark, then be step-length rotate counterclockwise adjustment frame to 15 ° with 1 °, filter Device modulation depth with the film polarizer anglec of rotation change as shown in Figure 2.As seen from the figure, in regulation, filter peak Wavelength and Free Spectral Range have almost no change, and illustrate the decoupling tuning for realizing modulation depth.Fig. 2 (a) is filter function With film polarizer rotate change curve, solid line correspondence when 1 ° turns to 11 ° modulation depth change, dotted line correspondence by The change of 12 ° of modulation depths when turning to 15 °.Corresponding modulating depth maximum situation when 1 °, with the rotation of polarizer, modulation Depth gradually lowers, and rotates to modulation depth minimum when 11 °, is now rotated further, and from dotted line, modulation depth is again with rotation The increase of gyration and increase.Modulation depth and the film polarizer anglec of rotation when Fig. 2 (b) is 1 ° to 11 ° for the anglec of rotation Relation curve, is approximately parabolic type.
Embodiment 2：Investigate the peak wavelength decoupling tuning capability of wave filter.Implementation condition is same as Example 1, but keeps Film polarizer angle is constant, and additional polarization maintaining optical fibre length is 3m.Gradually increase to the magnitude of voltage added by liquid crystal, obtain wave filter Peak wavelength and peak power with liquid crystal voltage change schematic diagram as shown in Figure 3.As seen from the figure, in regulation, wave filter Peak power has almost no change, and illustrates that modulation depth does not change with liquid crystal voltage, namely realizes the decoupling tune of peak wavelength It is humorous.Fig. 3 (a) is the change curve that peak wavelength and peak power are pressurizeed with liquid crystal；Fig. 3 (b) is liquid crystal retardation performance with added The change curve of voltage.Contrast that two curves are visible, the tuning of peak wavelength is completely corresponding with the voltage transformation characteristic of liquid crystal phase place, Therefore easily can carry out high duplication, height to peak wavelength controllably to adjust.Further, since being used in the system Half-wave liquid crystal phase retardation device, therefore tunable wavelength scope is 0.8nm, if using the higher liquid crystal of phase delay ability, can Tuning range can further increase.
Embodiment 3：Investigate the situation of change that wave filter Free Spectral Range changes with additional polarization maintaining optical fibre length.Implement bar Part is same as Example 1, but keeps film polarizer angle and the magnitude of voltage added by liquid crystal constant, changes different additional guarantors inclined Fiber lengths, obtain filter peak wavelength and peak power with liquid crystal voltage change schematic diagram as shown in Figure 4.Required Additional polarization maintaining optical fibre length can be calculated according to required Free Spectral Range according to formula：Δ ν=1/ ε l, and free light Transformational relation meets when spectral limit frequency and wavelength are stated：In use, it is noted that the l in formula is The total length sum of two collimater tail optical fibers, additional polarization maintaining optical fibre and rotating shaft polarization maintaining optical fibre front half section optical fiber.Fig. 4 (a) is additional guarantor Partially fiber lengths are the situation of 0m, and correspondence Free Spectral Range is 1.6nm；It is 1.5m that Fig. 4 (b) is additional polarization maintaining optical fibre length Situation, correspondence Free Spectral Range is 0.7nm；Fig. 4 (c) is the situation that additional polarization maintaining optical fibre length is 3m, corresponds to free spectrum Scope is 0.55nm；Fig. 4 (d) is the situation that additional polarization maintaining optical fibre length is 5m, and correspondence Free Spectral Range is 0.36nm.For Polarization maintaining optical fibre used in embodiment, its polarization mode dispersion constant be 1.6ps/m, and the second collimater tail optical fiber be 1m, rotating shaft Polarization maintaining optical fibre front half section fiber lengths be 0.5m, therefore by formula calculate to additional polarization maintaining optical fibre length be 0,1.5,3m and During 5m, Free Spectral Range is respectively 1.54,0.76,0.51nm and0.36nm, and is consistent in this example.
Embodiment 4：For centre wavelength 1053.1020nm, broadening amount is the wide spectrum optical of 0.38nm, through high power laser light The low extinction ratio polarization maintaining optical fibre section output of polarizer (inside having birefringece crystal), multistage in front end system, then by 10m polarization maintaining optical fibres After transmission, wave filter of the present invention, the liquid crystal control of film polarizer adjustment frame and phase type liquid crystal in wave filter are accessed Device processed is connected with computer, and to realize automatically controlling, and another interface of computer is connected with oscillograph, to receive oscillograph collection Real-time pulse waveform, the structural representation of the embodiment is as shown in Figure 5.Fig. 6 is to high power laser system using the wave filter The design sketch that the amplitude-frequency modulation that polarization mode dispersion causes is compensated.To weigh the size of amplitude-frequency modulation voltage, often define waveform and turn round Qu YinziPmaxAnd PminThe minimum and maximum crest voltage of pulse respectively on oscillograph.Fig. 6 (a) is to show Light pulse signal when not compensating that ripple device is collected, it is seen that waveform flat-top area serious amplitude-frequency occurs and modulates, α ≈ 18%, Due to the uncertain impact of external environment, the amplitude-frequency modulation voltage can change over time, and α can be changed to by 2% and be exceeded 20%；The light pulse signal after the compensation device of the present invention that Fig. 6 (b) is collected for oscillograph, it is seen that amplitude-frequency modulation voltage Can be by the magnitude of compensation to very little, α ≈ 3.2%, the close flat-top in pulse top；Fig. 6 (c) is to carry out automatic feedback using the present invention The situation of change that pulse amplitude-frequency is modulated in 3 hours after compensation, as seen from the figure, Jing devices of the present invention carry out automatic feedback benefit After repaying, the amplitude-frequency modulation voltage of pulse is controlled within 2～6.5%.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not limited to；For the skill of this area For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair Change, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (8)

1. a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion, including the first optical fiber collimator (1), installed in rotation Turn the film polarizer (2) in adjustment frame, the polarization maintaining optical fibre (6) of optical axis rotation and be furnished with the phase type liquid of liquid-crystal controller Brilliant (3), the second optical fiber collimator (4), additional polarization maintaining optical fibre (5) and optical fiber analyzer (7)；It is characterized in that：The phase type The optical axis of liquid crystal (3) is parallel with the tail optical fiber optical axis of the second optical fiber collimator (4), the tail optical fiber of first optical fiber collimator (1) with Input optical fibre connects, and film polarizer (2) described in the light Jing Jing after the first optical fiber collimator (1) collimates output becomes linearly polarized light Afterwards, incide on the phase type liquid crystal (3), after the phase type liquid crystal (3) of alternating voltage is loaded by liquid-crystal controller, then Optical fiber collimator (4) coupled into optical fibres of Jing second, the tail optical fiber of second optical fiber collimator (4) is defeated with additional polarization maintaining optical fibre (5) Enter end connection, the output end of the additional polarization maintaining optical fibre (5) is connected with the input of the polarization maintaining optical fibre (6), the polarization maintaining optical fibre (6) Output end be connected with the input of optical fiber analyzer (7), Jing after the analyzing of optical fiber analyzer (7), from optical fiber analyzer (7) Output end exports and continues to transmit into output optical fibre.
2. a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion according to claim 1, it is characterised in that： By the described film polarizer (2) of rotation, the voltage and the additional polarization maintaining optical fibre (5) of the phase type liquid crystal (3) are adjusted Length, realize respectively the modulation depth to wave filter, peak wavelength and Free Spectral Range decoupling adjust.
3. a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion according to claim 1 and 2, its feature exists In：By rotating the film polarizer (2), the polarization direction of the linearly polarized light and the liquid of the phase type liquid crystal (3) are made Brilliant optical axis is incident at an angle.
4. a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion according to claim 1, it is characterised in that： The tail optical fiber of second optical fiber collimator (5) adopts polarization maintaining optical fibre.
5. a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion according to claim 1, it is characterised in that： The normal direction of the film polarizer (2) is parallel with direction of beam propagation.
6. a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion according to claim 1, it is characterised in that： The length of the additional polarization maintaining optical fibre (5) is selected according to the actual requirements.
7. a kind of multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion according to claim 1, it is characterised in that： The polarization maintaining optical fibre (6) of the optical axis rotation is 45 ° to shaft angle degree.
8., according to a kind of arbitrary described multiple degrees of freedom spectral filter that can compensate for polarization mode dispersion of claim 1-7, it is special Levy and be：Described liquid-crystal controller and described rotation adjustment frame difference Jing computers (8) is connected with oscillograph (9), to realize Remote closed loop control.
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CN109212796A (en) * 2018-10-24 2019-01-15 北京航空航天大学 A kind of negative liquid crystal reflective spatial light modulator
CN113325568A (en) * 2021-05-13 2021-08-31 中国科学院上海光学精密机械研究所 Fast spectral imaging system based on liquid crystal and use method
CN117109643A (en) * 2023-10-24 2023-11-24 中国科学院长春光学精密机械与物理研究所 Test method and system using transmission type angle sensor

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