WO2020087764A1 - Random brillouin dynamic grating generation device and method - Google Patents

Random brillouin dynamic grating generation device and method Download PDF

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WO2020087764A1
WO2020087764A1 PCT/CN2019/000088 CN2019000088W WO2020087764A1 WO 2020087764 A1 WO2020087764 A1 WO 2020087764A1 CN 2019000088 W CN2019000088 W CN 2019000088W WO 2020087764 A1 WO2020087764 A1 WO 2020087764A1
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random
fiber
polarization
optical
electro
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French (fr)
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张建忠
宋盈盈
李石川
张明江
乔丽君
王涛
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太原理工大学
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
    • H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
    • 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
    • G02F1/35—Non-linear optics
    • G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06712—Polarising fibre; Polariser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06716—Fibre compositions or doping with active elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06783—Amplifying coupler
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
    • H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10061—Polarization control

Definitions

  • the invention relates to the technical field of Brillouin dynamic gratings, in particular to a random Brillouin dynamic grating generating device and method.
  • Brillouin dynamic grating has been used in the fields of optical fiber sensing, variable optical delay, all-optical signal processing, and high-precision spectrum analyzer due to its advantages of all-optical generation and flexible and controllable parameters.
  • the concept of the Brillouin dynamic grating was first proposed in 2008.
  • the Brillouin dynamic grating is produced by injecting two beams of pump light with the same polarization direction and the frequency difference of the Brillouin frequency shift into the two ends of the fiber. Interference occurs during the encounter, and the interference signal modulates the refractive index of the fiber to form a Brillouin dynamic grating (Optics Letters, 2008, 33 (9): 926-928.).
  • the generation of Brillouin dynamic gratings can be divided into two types according to the signal format of the pump light: time-domain systems and coherent-domain systems.
  • the pulsed optical signal is usually used as the pump light to generate the Brillouin dynamic grating;
  • the coherent domain system the two synchronized continuous optical signals whose frequencies are sinusoidally modulated or the two synchronized pseudorandom code signals are usually used Used as pump light to generate Brillouin dynamic grating.
  • chaotic Brillouin dynamic gratings Optics Communications, 2017, 396: 210-215.
  • a random Brillouin dynamic grating generating device including: laser source, 1 ⁇ 2 fiber coupler, first electro-optic modulator, first random optical pulse generator, first optical isolator, first erbium-doped fiber amplifier , Single sideband modulator, microwave source, first polarization controller, second electro-optic modulator, second random light pulse generator, second optical isolator, delay fiber, second erbium-doped fiber amplifier, second polarization control Device, polarization beam combiner, polarization maintaining fiber.
  • the exit end of the laser source is connected to the entrance end of the 1 ⁇ 2 fiber coupler through a single-mode fiber jumper.
  • the first output end of the 1 ⁇ 2 optical fiber coupler is connected to the incident end of the first electro-optical modulator through a single-mode optical fiber jumper; the signal output end of the first random optical pulse generator is connected to the The signal input end is connected; the output end of the first electro-optic modulator is connected to the entrance end of the first optical isolator through a single-mode fiber jumper; the output end of the first optical isolator is connected to the first erbium dopant through a single-mode fiber jumper
  • the input end of the fiber amplifier is connected; the output end of the first erbium-doped fiber amplifier is connected to the entrance end of the single sideband modulator through a single-mode fiber jumper; the signal output end of the microwave source is connected to the end of the single sideband modulator
  • the signal input end is connected; the exit end of the single sideband modulator is connected to the incident end of the first polarization controller through a single-mode fiber jumper.
  • the second output end of the 1 ⁇ 2 optical fiber coupler is connected to the incident end of the second electro-optical modulator through a single-mode optical fiber jumper; the signal output end of the second random optical pulse generator is connected to the The signal input end is connected; the exit end of the second electro-optic modulator is connected to the entrance end of the second optical isolator through a single-mode fiber jumper; the exit end of the second optical isolator is connected to the end of the delay fiber through a single-mode fiber jumper , The other end of the delay fiber is connected to the incident end of the second erbium-doped fiber amplifier through a single-mode fiber jumper; the exit end of the second erbium-doped fiber amplifier is connected to the second polarization controller through a single-mode fiber jumper The entrance end is connected; the exit end of the second polarization controller is connected to the entrance end of the polarization beam combiner through a single-mode fiber jumper.
  • Both ends of the polarization-maintaining fiber are respectively connected to the output end of the first polarization controller and the output end of the polarization beam combiner.
  • a method for generating a random Brillouin dynamic grating (this method is implemented in the above random Brillouin dynamic grating generating device). The method is implemented by the following steps:
  • the laser output from the laser source is divided into two pump light sources through a 1 ⁇ 2 fiber coupler.
  • the first pump light passes through the first electro-optic modulator, it is modulated by the first random light pulse generator into random light pulses with randomly varying repetition frequencies.
  • the random light pulses with randomly varying repetition frequencies pass through the first optical isolator,
  • the first erbium-doped fiber amplifier is amplified, and the amplified random light pulse with randomly varying repetition frequency is subjected to a frequency shift by the action of a single sideband modulator controlled by a microwave source.
  • the frequency shift is the Brillouin frequency shift of the polarization-maintaining fiber
  • the random light pulse whose repetition frequency changes randomly after the frequency shift passes through the first polarization controller and enters an optical main axis of the polarization-maintaining fiber.
  • the second pump light passes through the second electro-optic modulator, it is modulated by the second random light pulse generator into another random light pulse with randomly varying repetition frequency, and the random light pulse with randomly varying repetition frequency passes through the second optical isolation in turn
  • the optical fiber, the delay fiber, the second erbium-doped fiber amplifier, the second polarization controller, and the polarization beam combiner enter the same optical main axis of the polarization-maintaining fiber.
  • the two random light pulse pump light meets in the polarization-maintaining fiber and interferes.
  • the signal light generated after the interference modulates the refractive index of the polarization-maintaining fiber to form a random Brillouin dynamic grating.
  • the invention uses two random light pulses with different repetition frequencies randomly changing as two pumping lights, which are injected from both ends of the polarization-maintaining fiber respectively, the polarization direction is the same, and the frequency difference is the Brillouin frequency shift of the fiber.
  • a new Brillouin dynamic grating is produced at the meeting point of the optical fibers, which is called a random Brillouin dynamic grating.
  • the grating period of the random Brillouin dynamic grating is not uniform, and the generated grating is randomly distributed.
  • Stochastic Brillouin dynamic gratings can be used to provide random feedback and realize photon localization due to this unique characteristic, so as to construct random fiber lasers.
  • the generation of a random Brillouin dynamic grating is formed by two random light pulses with different repetition frequencies randomly changing as two pump lights, and interference occurs in the polarization-maintaining fiber, and the interference field modulates the refractive index of the fiber.
  • the grating period of random Brillouin dynamic gratings is non-uniform, and the resulting gratings are randomly distributed, which can be used to provide random feedback and achieve photon localization, thereby constructing random fiber-optic laser.
  • FIG. 1 shows a schematic diagram of a random Brillouin dynamic grating generating device according to the present invention.
  • Figure 2 shows the results of the numerical simulation of the random Brillouin dynamic grating.
  • a random Brillouin dynamic grating generating device includes a laser source 1, a 1 ⁇ 2 fiber coupler 2, a first electro-optic modulator 3, a first random light pulse generator 4, and a first light Isolator 5, first erbium-doped fiber amplifier 6, single sideband modulator 7, microwave source 8, first polarization controller 9, second electro-optic modulator 10, second random light pulse generator 11, second optical isolation 12, a delay fiber 13, a second erbium-doped fiber amplifier 14, a second polarization controller 15, a polarization beam combiner 16, and a polarization maintaining fiber 17.
  • the output end of the laser source 1 is connected to the incident end of the 1 ⁇ 2 fiber coupler 2 through a single-mode fiber jumper, and the output of the laser source 1 is divided into two channels of pump light through the 1 ⁇ 2 fiber coupler 2; 1 ⁇ 2 fiber coupling
  • the first output end of the modulator 2 is connected to the incident end of the first electro-optical modulator 3 through a single-mode fiber jumper;
  • the signal output end of the first random optical pulse generator 4 is connected to the signal input end of the first electro-optical modulator 3;
  • the output end of the first electro-optic modulator 3 is connected to the entrance end of the first optical isolator 5 through a single-mode fiber jumper;
  • the output end of the first optical isolator 5 is connected to the entrance end of the first erbium-doped fiber amplifier 6 through a single-mode fiber jumper Connection;
  • the output end of the first erbium-doped fiber amplifier 6 is connected to the incident end of the single sideband modulator
  • the second exit end of the 1 ⁇ 2 fiber coupler 2 is connected to the entrance end of the second electro-optical modulator 10 through a single-mode fiber jumper; the signal output end of the second random optical pulse generator 11 is connected to the second electro-optical modulator 12 ’s
  • the signal input end is connected; the output end of the second electro-optical modulator 12 is connected to the incident end of the second optical isolator 12 through a single-mode fiber jumper; the output end of the second optical isolator 12 is connected to one end of the delay fiber 13 through a single-mode fiber jumper ,
  • the other end of the delay fiber 13 is connected to the incident end of the second erbium-doped fiber amplifier 14 through a single-mode fiber jumper; the output end of the second erbium-doped fiber amplifier 14 is connected to the second polarization controller 15 through the single-mode fiber jumper
  • the entrance end is connected; the exit end of the second polarization controller 15 is connected to the entrance end of the polarization beam combine
  • Random Brillouin dynamic grating generation method Random Brillouin dynamic grating generation method
  • the laser output from the laser source is divided into two pump light sources through a 1 ⁇ 2 fiber coupler.
  • the first pump light passes through the first electro-optic modulator, it is modulated by the first random light pulse generator into random light pulses with randomly varying repetition frequencies.
  • the random light pulses with randomly varying repetition frequencies pass through the first optical isolator,
  • the first erbium-doped fiber amplifier is amplified, and the amplified random light pulse with randomly varying repetition frequency is subjected to a frequency shift by the action of a single sideband modulator controlled by a microwave source.
  • the frequency shift is the Brillouin frequency shift of the polarization-maintaining fiber
  • the random light pulse whose repetition frequency changes randomly after the frequency shift passes through the first polarization controller and enters an optical main axis of the polarization-maintaining fiber.
  • the second pump light passes through the second electro-optic modulator, it is modulated by the second random light pulse generator into another random light pulse with randomly varying repetition frequency, and the random light pulse with randomly varying repetition frequency passes through the second optical isolation in turn
  • the optical fiber, the delay fiber, the second erbium-doped fiber amplifier, the second polarization controller, and the polarization beam combiner enter the same optical main axis of the polarization-maintaining fiber.
  • the two random light pulse pump light meets in the polarization-maintaining fiber and interferes.
  • the signal light generated after the interference modulates the refractive index of the polarization-maintaining fiber to form a random Brillouin dynamic grating.
  • the pulse width of random light pulses with randomly varying repetition frequencies is 0.08 ns
  • the coupling ratio of the 1 ⁇ 2 fiber coupler is 50:50
  • the polarization maintaining fiber 17 is a panda type polarization maintaining fiber.
  • a random Brillouin dynamic grating is generated through numerical simulation experiments; two random light pulses with randomly varying repetition frequencies are used as two pump light sources, namely Pump1 and Pump2, and the pulse width is 0.08ns, and the two beams of pump light are The polarization direction is the same, and the frequency difference is different by a Brillouin frequency shift.
  • interference occurs to form a random Brillouin dynamic grating.
  • the theoretical model of the stochastic Brillouin dynamic grating is established using the coupled wave equation system consisting of two pump lights and an acoustic wave field:
  • a p1 and A p2 represent the slowly varying electric field amplitudes of Pump1 and Pump2 respectively;
  • Q is the amplitude of the acoustic wave field generated by electrostriction after Pump1 and Pump2 interfere in the polarization-maintaining fiber;
  • ⁇ 1s is the polarization-maintaining fiber The group delay of the unit length of the axis;
  • ⁇ v pump1 -v pump2 -v B , which is the frequency detuning of Pump1 and Pump2;
  • ⁇ B is the phonon lifetime.
  • the acoustic wave field distribution of the random Brillouin dynamic grating obtained by the numerical simulation of the above coupled equation system, that is, the random Brillouin dynamic grating, is shown in FIG. 2.

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  • Optics & Photonics (AREA)
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Abstract

Disclosed is a random Brillouin dynamic grating generation device, comprising a laser source, 1 × 2 optical fiber couplers, a first electro-optic modulator, a first random optical pulse generator, a first optical isolator, a first erbium-doped optical fiber amplifier, a single sideband modulator, a microwave source, a first polarization controller, a second electro-optic modulator, a second random optical pulse generator, a second optical isolator, a delay optical fiber, a second erbium-doped optical fiber amplifier, a second polarization controller, a polarization beam combiner, and a polarization maintaining optical fiber. In the present invention, two random optical pulses that change randomly and have different repetition frequencies are used as two pump lights, and the two pump lights are respectively injected from two ends of the polarization maintaining optical fiber; polarization directions of the two pump lights are the same, and the frequency difference is a Brillouin frequency shift of the optical fiber, such that new Brillouin dynamic grating is generated at a position of the polarization maintaining optical fiber where the two pump lights meet. A grating period of the random Brillouin dynamic grating is non-uniform, and the generated grating is randomly distributed. The random Brillouin dynamic grating can be used to provide random feedback and to localize photons, thereby achieving the construction of a random optical fiber laser.

Description

随机布里渊动态光栅的产生装置及方法Random Brillouin dynamic grating generating device and method 技术领域Technical field
本发明涉及布里渊动态光栅技术领域，具体是一种随机布里渊动态光栅的产生装置及方法。The invention relates to the technical field of Brillouin dynamic gratings, in particular to a random Brillouin dynamic grating generating device and method.
背景技术Background technique
布里渊动态光栅(BDG)因具有全光产生、参数灵活可控的优点，已经被应用于光纤传感、可变光延迟、全光信号处理、高精度光谱分析仪等领域。布里渊动态光栅的概念是2008年首次被提出，布里渊动态光栅的产生是通过向光纤两端分别注入偏振方向相同、频率差为布里渊频移的两束泵浦光，在光纤中相遇发生干涉，干涉信号调制光纤的折射率从而形成布里渊动态光栅(Optics Letters，2008，33(9)：926-928.)。目前，布里渊动态光栅的产生依据泵浦光的信号格式主要可分为两类：时域系统和相干域系统。在时域系统中，通常采用脉冲光信号作为泵浦光产生布里渊动态光栅；在相干域系统中，通常采用频率被正弦调制的两个同步连续光信号或者两个同步的伪随机码信号作为泵浦光来产生布里渊动态光栅。近来，利用混沌激光作为泵浦光，在保偏光纤中产生了混沌布里渊动态光栅(Optics Communications，2017，396：210-215.)。Brillouin dynamic grating (BDG) has been used in the fields of optical fiber sensing, variable optical delay, all-optical signal processing, and high-precision spectrum analyzer due to its advantages of all-optical generation and flexible and controllable parameters. The concept of the Brillouin dynamic grating was first proposed in 2008. The Brillouin dynamic grating is produced by injecting two beams of pump light with the same polarization direction and the frequency difference of the Brillouin frequency shift into the two ends of the fiber. Interference occurs during the encounter, and the interference signal modulates the refractive index of the fiber to form a Brillouin dynamic grating (Optics Letters, 2008, 33 (9): 926-928.). At present, the generation of Brillouin dynamic gratings can be divided into two types according to the signal format of the pump light: time-domain systems and coherent-domain systems. In the time domain system, the pulsed optical signal is usually used as the pump light to generate the Brillouin dynamic grating; in the coherent domain system, the two synchronized continuous optical signals whose frequencies are sinusoidally modulated or the two synchronized pseudorandom code signals are usually used Used as pump light to generate Brillouin dynamic grating. Recently, using chaotic lasers as pump light, chaotic Brillouin dynamic gratings (Optics Communications, 2017, 396: 210-215.) Have been generated in polarization maintaining fibers.
发明内容Summary of the invention
本发明为了解决现有的布里渊动态光栅因光栅周期均匀、光栅分布规律而无法应用在随机光纤激光器中，提出一种新的布里渊动态光栅产生装置及方法。In order to solve the problem that the existing Brillouin dynamic grating cannot be applied to the random fiber laser due to the uniform grating period and the grating distribution law, a new Brillouin dynamic grating generating device and method are proposed.
本发明是采用如下技术方案实现的：The present invention is implemented using the following technical solution:
一种随机布里渊动态光栅的产生装置，包括：激光源、1×2光纤耦合器、 第一电光调制器、第一随机光脉冲发生器、第一光隔离器、第一掺铒光纤放大器、单边带调制器、微波源、第一偏振控制器、第二电光调制器、第二随机光脉冲发生器、第二光隔离器、延迟光纤、第二掺铒光纤放大器、第二偏振控制器、偏振合束器、保偏光纤。A random Brillouin dynamic grating generating device, including: laser source, 1 × 2 fiber coupler, first electro-optic modulator, first random optical pulse generator, first optical isolator, first erbium-doped fiber amplifier , Single sideband modulator, microwave source, first polarization controller, second electro-optic modulator, second random light pulse generator, second optical isolator, delay fiber, second erbium-doped fiber amplifier, second polarization control Device, polarization beam combiner, polarization maintaining fiber.
所述激光源的出射端通过单模光纤跳线与1×2光纤耦合器的入射端连接。The exit end of the laser source is connected to the entrance end of the 1 × 2 fiber coupler through a single-mode fiber jumper.
所述1×2光纤耦合器的第一个出射端通过单模光纤跳线与第一电光调制器入射端连接；所述第一随机光脉冲发生器的信号输出端与第一电光调制器的信号输入端连接；所述第一电光调制器出射端通过单模光纤跳线与第一光隔离器入射端连接；所述第一光隔离器出射端通过单模光纤跳线与第一掺铒光纤放大器的入射端连接；所述第一掺铒光纤放大器的出射端通过单模光纤跳线与单边带调制器的入射端连接；所述微波源的信号输出端与单边带调制器的信号输入端连接；所述单边带调制器的出射端通过单模光纤跳线与第一偏振控制器的入射端连接。The first output end of the 1 × 2 optical fiber coupler is connected to the incident end of the first electro-optical modulator through a single-mode optical fiber jumper; the signal output end of the first random optical pulse generator is connected to the The signal input end is connected; the output end of the first electro-optic modulator is connected to the entrance end of the first optical isolator through a single-mode fiber jumper; the output end of the first optical isolator is connected to the first erbium dopant through a single-mode fiber jumper The input end of the fiber amplifier is connected; the output end of the first erbium-doped fiber amplifier is connected to the entrance end of the single sideband modulator through a single-mode fiber jumper; the signal output end of the microwave source is connected to the end of the single sideband modulator The signal input end is connected; the exit end of the single sideband modulator is connected to the incident end of the first polarization controller through a single-mode fiber jumper.
所述1×2光纤耦合器的第二个出射端通过单模光纤跳线与第二电光调制器入射端连接；所述第二随机光脉冲发生器的信号输出端与第二电光调制器的信号输入端连接；所述第二电光调制器出射端通过单模光纤跳线与第二光隔离器入射端连接；所述第二光隔离器出射端通过单模光纤跳线与延迟光纤一端连接，所述延迟光纤的另一端通过单模光纤跳线与第二掺铒光纤放大器的入射端连接；所述第二掺铒光纤放大器的出射端通过单模光纤跳线与第二偏振控制器的入射端连接；所述第二偏振控制器的出射端通过单模光纤跳线与偏振合束器的入射端连接。The second output end of the 1 × 2 optical fiber coupler is connected to the incident end of the second electro-optical modulator through a single-mode optical fiber jumper; the signal output end of the second random optical pulse generator is connected to the The signal input end is connected; the exit end of the second electro-optic modulator is connected to the entrance end of the second optical isolator through a single-mode fiber jumper; the exit end of the second optical isolator is connected to the end of the delay fiber through a single-mode fiber jumper , The other end of the delay fiber is connected to the incident end of the second erbium-doped fiber amplifier through a single-mode fiber jumper; the exit end of the second erbium-doped fiber amplifier is connected to the second polarization controller through a single-mode fiber jumper The entrance end is connected; the exit end of the second polarization controller is connected to the entrance end of the polarization beam combiner through a single-mode fiber jumper.
所述保偏光纤的两端分别与第一偏振控制器的出射端和偏振合束器的出射端连接。Both ends of the polarization-maintaining fiber are respectively connected to the output end of the first polarization controller and the output end of the polarization beam combiner.
一种随机布里渊动态光栅的产生方法(该方法在上述的随机布里渊动态光栅的产生装置中实现)，该方法采用如下步骤实现：A method for generating a random Brillouin dynamic grating (this method is implemented in the above random Brillouin dynamic grating generating device). The method is implemented by the following steps:
激光源输出激光经过1×2光纤耦合器分成两路泵浦光源。The laser output from the laser source is divided into two pump light sources through a 1 × 2 fiber coupler.
第一路泵浦光经过第一电光调制器后，被第一随机光脉冲发生器后被调制为重复频率随机变化的随机光脉冲，重复频率随机变化的随机光脉冲经过第一光隔离器、第一掺铒光纤放大器进行放大，被放大的重复频率随机变化的随机光脉冲经微波源控制的单边带调制器作用后进行频移，频移的大小为保偏光纤的布里渊频移量，频移后的重复频率随机变化的随机光脉冲再经过第一偏振控制器进入保偏光纤的一个光学主轴。After the first pump light passes through the first electro-optic modulator, it is modulated by the first random light pulse generator into random light pulses with randomly varying repetition frequencies. The random light pulses with randomly varying repetition frequencies pass through the first optical isolator, The first erbium-doped fiber amplifier is amplified, and the amplified random light pulse with randomly varying repetition frequency is subjected to a frequency shift by the action of a single sideband modulator controlled by a microwave source. The frequency shift is the Brillouin frequency shift of the polarization-maintaining fiber The random light pulse whose repetition frequency changes randomly after the frequency shift passes through the first polarization controller and enters an optical main axis of the polarization-maintaining fiber.
第二路泵浦光经过第二电光调制器后，被第二随机光脉冲发生器被调制为另一重复频率随机变化的随机光脉冲，重复频率随机变化的随机光脉冲依次经过第二光隔离器、延迟光纤、第二掺铒光纤放大器、第二偏振控制器、偏振合束器进入保偏光纤的同一光学主轴。After the second pump light passes through the second electro-optic modulator, it is modulated by the second random light pulse generator into another random light pulse with randomly varying repetition frequency, and the random light pulse with randomly varying repetition frequency passes through the second optical isolation in turn The optical fiber, the delay fiber, the second erbium-doped fiber amplifier, the second polarization controller, and the polarization beam combiner enter the same optical main axis of the polarization-maintaining fiber.
两路随机光脉冲泵浦光在保偏光纤中相遇发生干涉效应，由此干涉后产生的信号光调制保偏光纤的折射率，形成随机布里渊动态光栅。The two random light pulse pump light meets in the polarization-maintaining fiber and interferes. The signal light generated after the interference modulates the refractive index of the polarization-maintaining fiber to form a random Brillouin dynamic grating.
本发明利用两个不同重复频率随机变化的随机光脉冲作为两束泵浦光，分别从保偏光纤的两端注入，其偏振方向相同，频差为光纤的布里渊频移，在保偏光纤相遇处产生一个新的布里渊动态光栅，称之为随机布里渊动态光栅。与现有的布里渊动态光栅相比，随机布里渊动态光栅的光栅周期是不均匀的，产生的光栅是随机分布的。随机布里渊动态光栅因其具有这一独特的特性，可被用于提供随机反馈，实现光子局域化，从而构建随机光纤激光器。The invention uses two random light pulses with different repetition frequencies randomly changing as two pumping lights, which are injected from both ends of the polarization-maintaining fiber respectively, the polarization direction is the same, and the frequency difference is the Brillouin frequency shift of the fiber. A new Brillouin dynamic grating is produced at the meeting point of the optical fibers, which is called a random Brillouin dynamic grating. Compared with the existing Brillouin dynamic grating, the grating period of the random Brillouin dynamic grating is not uniform, and the generated grating is randomly distributed. Stochastic Brillouin dynamic gratings can be used to provide random feedback and realize photon localization due to this unique characteristic, so as to construct random fiber lasers.
本发明所述的随机布里渊动态光栅存在以下优点：The random Brillouin dynamic grating described in the present invention has the following advantages:
1、随机布里渊动态光栅的产生是由两个不同重复频率随机变化的随机光脉冲作为两束泵浦光，在保偏光纤中发生干涉，干涉场调制光纤折射率而形成。与其它的布里渊动态光栅相比，随机布里渊动态光栅的光栅周期是不均匀的，产生的光栅是随机分布的，可被用于提供随机反馈，实现光子局域化，从而构建随机光纤激光器。1. The generation of a random Brillouin dynamic grating is formed by two random light pulses with different repetition frequencies randomly changing as two pump lights, and interference occurs in the polarization-maintaining fiber, and the interference field modulates the refractive index of the fiber. Compared with other Brillouin dynamic gratings, the grating period of random Brillouin dynamic gratings is non-uniform, and the resulting gratings are randomly distributed, which can be used to provide random feedback and achieve photon localization, thereby constructing random fiber-optic laser.
2、与目前利用飞秒激光在光纤中刻入固定性的随机光纤光栅相比随机布里渊动态光栅是通过在光纤两端实时注入泵浦光快速形成的，具有快速重构、读写分离、位置可调的优点。2. Compared with the current use of femtosecond lasers to engrave fixed random fiber gratings in optical fibers, random Brillouin dynamic gratings are quickly formed by injecting pump light at both ends of the fiber in real time, with rapid reconstruction and read-write separation 3. The advantages of adjustable position.
附图说明BRIEF DESCRIPTION
图1表示本发明所述随机布里渊动态光栅产生装置的示意图。FIG. 1 shows a schematic diagram of a random Brillouin dynamic grating generating device according to the present invention.
图2表示数值模拟产生的随机布里渊动态光栅的结果图。Figure 2 shows the results of the numerical simulation of the random Brillouin dynamic grating.
图中：1-激光源，2-1×2光纤耦合器，3-第一电光调制器，4-第一随机光脉冲发生器，5-第一光隔离器，6-第一掺铒光纤放大器，7-单边带调制器，8-微波源，9-第一偏振控制器，10-第二电光调制器，11-第二随机光脉冲发生器，12-第二光隔离器，13-延迟光纤，14-第二掺铒光纤放大器，15-第二偏振控制器，16-偏振合束器，17-保偏光纤。In the picture: 1-laser source, 2-1 × 2 fiber coupler, 3-first electro-optic modulator, 4-first random optical pulse generator, 5-first optical isolator, 6-first erbium-doped fiber Amplifier, 7-single sideband modulator, 8-microwave source, 9-first polarization controller, 10-second electro-optic modulator, 11-second random optical pulse generator, 12-second optical isolator, 13 -Delay fiber, 14-second erbium-doped fiber amplifier, 15-second polarization controller, 16-polarization beam combiner, 17- polarization maintaining fiber.
具体实施方式detailed description
下面结合附图对本发明的具体实施例进行详细说明。The specific embodiments of the present invention will be described in detail below with reference to the drawings.
一种随机布里渊动态光栅的产生装置，如图1所示，包括激光源1、1×2光纤耦合器2、第一电光调制器3、第一随机光脉冲发生器4、第一光隔离器5、第一掺铒光纤放大器6、单边带调制器7、微波源8、第一偏振控制器9、第二电光调制器10、第二随机光脉冲发生器11、第二光隔离器12、延迟光纤13、第二掺铒光纤放大器14、第二偏振控制器15、偏振合束器 16、保偏光纤17。A random Brillouin dynamic grating generating device, as shown in FIG. 1, includes a laser source 1, a 1 × 2 fiber coupler 2, a first electro-optic modulator 3, a first random light pulse generator 4, and a first light Isolator 5, first erbium-doped fiber amplifier 6, single sideband modulator 7, microwave source 8, first polarization controller 9, second electro-optic modulator 10, second random light pulse generator 11, second optical isolation 12, a delay fiber 13, a second erbium-doped fiber amplifier 14, a second polarization controller 15, a polarization beam combiner 16, and a polarization maintaining fiber 17.
激光源1的出射端通过单模光纤跳线与1×2光纤耦合器2的入射端连接，激光源1的输出经过1×2光纤耦合器2分成两路泵浦光；1×2光纤耦合器2的第一个出射端通过单模光纤跳线与第一电光调制器3入射端连接；第一随机光脉冲发生器4的信号输出端与第一电光调制器3的信号输入端连接；第一电光调制器3出射端通过单模光纤跳线与第一光隔离器5入射端连接；第一光隔离器5出射端通过单模光纤跳线与第一掺铒光纤放大器6的入射端连接；第一掺铒光纤放大器6的出射端通过单模光纤跳线与单边带调制器7的入射端连接；微波源8的信号输出端与单边带调制器7的信号输入端连接；单边带调制器7的出射端通过单模光纤跳线与第一偏振控制器9的入射端连接。1×2光纤耦合器2的第二个出射端通过单模光纤跳线与第二电光调制器10入射端连接；第二随机光脉冲发生器11的信号输出端与第二电光调制器12的信号输入端连接；第二电光调制器12出射端通过单模光纤跳线与第二光隔离器12入射端连接；第二光隔离器12出射端通过单模光纤跳线与延迟光纤13一端连接，延迟光纤13的另一端通过单模光纤跳线与第二掺铒光纤放大器14的入射端连接；第二掺铒光纤放大器14的出射端通过单模光纤跳线与第二偏振控制器15的入射端连接；第二偏振控制器15的出射端通过单模光纤跳线与偏振合束器16的入射端连接；保偏光纤17的两端分别与第一偏振控制器9的出射端和偏振合束器16的出射端连接。The output end of the laser source 1 is connected to the incident end of the 1 × 2 fiber coupler 2 through a single-mode fiber jumper, and the output of the laser source 1 is divided into two channels of pump light through the 1 × 2 fiber coupler 2; 1 × 2 fiber coupling The first output end of the modulator 2 is connected to the incident end of the first electro-optical modulator 3 through a single-mode fiber jumper; the signal output end of the first random optical pulse generator 4 is connected to the signal input end of the first electro-optical modulator 3; The output end of the first electro-optic modulator 3 is connected to the entrance end of the first optical isolator 5 through a single-mode fiber jumper; the output end of the first optical isolator 5 is connected to the entrance end of the first erbium-doped fiber amplifier 6 through a single-mode fiber jumper Connection; the output end of the first erbium-doped fiber amplifier 6 is connected to the incident end of the single sideband modulator 7 through a single-mode fiber jumper; the signal output end of the microwave source 8 is connected to the signal input end of the single sideband modulator 7; The exit end of the single-sideband modulator 7 is connected to the entrance end of the first polarization controller 9 through a single-mode fiber jumper. The second exit end of the 1 × 2 fiber coupler 2 is connected to the entrance end of the second electro-optical modulator 10 through a single-mode fiber jumper; the signal output end of the second random optical pulse generator 11 is connected to the second electro-optical modulator 12 ’s The signal input end is connected; the output end of the second electro-optical modulator 12 is connected to the incident end of the second optical isolator 12 through a single-mode fiber jumper; the output end of the second optical isolator 12 is connected to one end of the delay fiber 13 through a single-mode fiber jumper , The other end of the delay fiber 13 is connected to the incident end of the second erbium-doped fiber amplifier 14 through a single-mode fiber jumper; the output end of the second erbium-doped fiber amplifier 14 is connected to the second polarization controller 15 through the single-mode fiber jumper The entrance end is connected; the exit end of the second polarization controller 15 is connected to the entrance end of the polarization beam combiner 16 through a single-mode fiber jumper; the two ends of the polarization maintaining fiber 17 are respectively connected to the exit end and the polarization of the first polarization controller 9 The exit end of the beam combiner 16 is connected.
随机布里渊动态光栅的产生方法：Random Brillouin dynamic grating generation method:
激光源输出激光经过1×2光纤耦合器分成两路泵浦光源。第一路泵浦光经过第一电光调制器后，被第一随机光脉冲发生器后被调制为重复频率随 机变化的随机光脉冲，重复频率随机变化的随机光脉冲经过第一光隔离器、第一掺铒光纤放大器进行放大，被放大的重复频率随机变化的随机光脉冲经微波源控制的单边带调制器作用后进行频移，频移的大小为保偏光纤的布里渊频移量，频移后的重复频率随机变化的随机光脉冲再经过第一偏振控制器进入保偏光纤的一个光学主轴。第二路泵浦光经过第二电光调制器后，被第二随机光脉冲发生器被调制为另一重复频率随机变化的随机光脉冲，重复频率随机变化的随机光脉冲依次经过第二光隔离器、延迟光纤、第二掺铒光纤放大器、第二偏振控制器、偏振合束器进入保偏光纤的同一光学主轴。两路随机光脉冲泵浦光在保偏光纤中相遇发生干涉效应，由此干涉后产生的信号光调制保偏光纤的折射率，形成随机布里渊动态光栅。The laser output from the laser source is divided into two pump light sources through a 1 × 2 fiber coupler. After the first pump light passes through the first electro-optic modulator, it is modulated by the first random light pulse generator into random light pulses with randomly varying repetition frequencies. The random light pulses with randomly varying repetition frequencies pass through the first optical isolator, The first erbium-doped fiber amplifier is amplified, and the amplified random light pulse with randomly varying repetition frequency is subjected to a frequency shift by the action of a single sideband modulator controlled by a microwave source. The frequency shift is the Brillouin frequency shift of the polarization-maintaining fiber The random light pulse whose repetition frequency changes randomly after the frequency shift passes through the first polarization controller and enters an optical main axis of the polarization-maintaining fiber. After the second pump light passes through the second electro-optic modulator, it is modulated by the second random light pulse generator into another random light pulse with randomly varying repetition frequency, and the random light pulse with randomly varying repetition frequency passes through the second optical isolation in turn The optical fiber, the delay fiber, the second erbium-doped fiber amplifier, the second polarization controller, and the polarization beam combiner enter the same optical main axis of the polarization-maintaining fiber. The two random light pulse pump light meets in the polarization-maintaining fiber and interferes. The signal light generated after the interference modulates the refractive index of the polarization-maintaining fiber to form a random Brillouin dynamic grating.
具体实施时，重复频率随机变化的随机光脉冲的脉冲宽度为0.08ns，1×2光纤耦合器的耦合比为50：50，保偏光纤17为熊猫型保偏光纤。In specific implementation, the pulse width of random light pulses with randomly varying repetition frequencies is 0.08 ns, the coupling ratio of the 1 × 2 fiber coupler is 50:50, and the polarization maintaining fiber 17 is a panda type polarization maintaining fiber.
目前通过数值模拟实验产生了随机布里渊动态光栅；利用两束重复频率随机变化的随机光脉冲作为两路泵浦光源，即Pump1和Pump2，且脉冲宽度为0.08ns，两束泵浦光为偏振方向相同，相差一个布里渊频移的频率差，在保偏光中相遇发生干涉作用而形成随机布里渊动态光栅。在数值模拟中，利用两束泵浦光和一个声波场组成的耦合波方程组建立了随机布里渊动态光栅产生的理论模型：At present, a random Brillouin dynamic grating is generated through numerical simulation experiments; two random light pulses with randomly varying repetition frequencies are used as two pump light sources, namely Pump1 and Pump2, and the pulse width is 0.08ns, and the two beams of pump light are The polarization direction is the same, and the frequency difference is different by a Brillouin frequency shift. When encountering in the polarization maintaining light, interference occurs to form a random Brillouin dynamic grating. In the numerical simulation, the theoretical model of the stochastic Brillouin dynamic grating is established using the coupled wave equation system consisting of two pump lights and an acoustic wave field:
Figure PCTCN2019000088-appb-000001
Figure PCTCN2019000088-appb-000001
Figure PCTCN2019000088-appb-000002
Figure PCTCN2019000088-appb-000002
Figure PCTCN2019000088-appb-000003
Figure PCTCN2019000088-appb-000003
其中，A p1，A p2分别表示Pump1，Pump2的慢变电场振幅；Q为Pump1和Pump2在保偏光纤中发生干涉后，电致伸缩作用产生的声波场振幅；β 1s 为保偏光纤慢轴单位长度的群时延；Δω＝v pump1-v pump2-v B，是Pump1和Pump2的频率失谐量；τ B为声子寿命。 Where A p1 and A p2 represent the slowly varying electric field amplitudes of Pump1 and Pump2 respectively; Q is the amplitude of the acoustic wave field generated by electrostriction after Pump1 and Pump2 interfere in the polarization-maintaining fiber; β 1s is the polarization-maintaining fiber The group delay of the unit length of the axis; Δω = v pump1 -v pump2 -v B , which is the frequency detuning of Pump1 and Pump2; τ B is the phonon lifetime.
通过上述耦合方程组数值仿真得到的随机布里渊动态光栅的声波场分布，即随机布里渊动态光栅，如图2所示。The acoustic wave field distribution of the random Brillouin dynamic grating obtained by the numerical simulation of the above coupled equation system, that is, the random Brillouin dynamic grating, is shown in FIG. 2.
应当指出，对于本技术领域的一般技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和应用，这些改进和应用也视为本发明的保护范围。It should be noted that, for those of ordinary skill in the art, without departing from the principles of the present invention, several improvements and applications can be made, and these improvements and applications are also considered to be within the protection scope of the present invention.

Claims (4)

  1. 一种随机布里渊动态光栅的产生装置，其特征在于：包括激光源(1)、1×2光纤耦合器(2)、第一电光调制器(3)、第一随机光脉冲发生器(4)、第一光隔离器(5)、第一掺铒光纤放大器(6)、单边带调制器(7)、微波源(8)、第一偏振控制器(9)、第二电光调制器(10)、第二随机光脉冲发生器(11)、第二光隔离器(12)、延迟光纤(13)、第二掺铒光纤放大器(14)、第二偏振控制器(15)、偏振合束器(16)、保偏光纤(17)；A random Brillouin dynamic grating generating device, characterized in that it includes a laser source (1), a 1 × 2 fiber coupler (2), a first electro-optic modulator (3), and a first random optical pulse generator ( 4), first optical isolator (5), first erbium-doped fiber amplifier (6), single sideband modulator (7), microwave source (8), first polarization controller (9), second electro-optic modulation (10), second random light pulse generator (11), second optical isolator (12), delay fiber (13), second erbium-doped fiber amplifier (14), second polarization controller (15), Polarization beam combiner (16), polarization-maintaining fiber (17);
    所述激光源(1)的出射端通过单模光纤跳线与1×2光纤耦合器(2)的入射端连接；The exit end of the laser source (1) is connected to the entrance end of the 1 × 2 fiber coupler (2) through a single-mode fiber jumper;
    所述1×2光纤耦合器(2)的第一个出射端通过单模光纤跳线与第一电光调制器(3)入射端连接；所述第一随机光脉冲发生器(4)的信号输出端与第一电光调制器(3)的信号输入端连接；所述第一电光调制器(3)出射端通过单模光纤跳线与第一光隔离器(5)入射端连接；所述第一光隔离器(5)出射端通过单模光纤跳线与第一掺铒光纤放大器(6)的入射端连接；所述第一掺铒光纤放大器(6)的出射端通过单模光纤跳线与单边带调制器(7)的入射端连接；所述微波源(8)的信号输出端与单边带调制器(7)的信号输入端连接；所述单边带调制器(7)的出射端通过单模光纤跳线与第一偏振控制器(9)的入射端连接；The first exit end of the 1 × 2 fiber coupler (2) is connected to the entrance end of the first electro-optic modulator (3) through a single-mode fiber jumper; the signal of the first random light pulse generator (4) The output end is connected to the signal input end of the first electro-optic modulator (3); the output end of the first electro-optic modulator (3) is connected to the entrance end of the first optical isolator (5) through a single-mode fiber jumper; The exit end of the first optical isolator (5) is connected to the incident end of the first erbium-doped fiber amplifier (6) through a single-mode fiber jumper; the exit end of the first erbium-doped fiber amplifier (6) is jumped through the single-mode fiber The line is connected to the incident end of the single sideband modulator (7); the signal output end of the microwave source (8) is connected to the signal input end of the single sideband modulator (7); the single sideband modulator (7) ) The output end is connected to the entrance end of the first polarization controller (9) through a single-mode fiber jumper;
    所述1×2光纤耦合器(2)的第二个出射端通过单模光纤跳线与第二电光调制器(10)入射端连接；所述第二随机光脉冲发生器(11)的信号输出端与第二电光调制器(12)的信号输入端连接；所述第二电光调制器(12)出射端通过单模光纤跳线与第二光隔离器(12)入射端连接；所述第二光隔离器(12)出射端通过单模光纤跳线与延迟光纤(13)一端连接，所述 延迟光纤(13)的另一端通过单模光纤跳线与第二掺铒光纤放大器(14)的入射端连接；所述第二掺铒光纤放大器(14)的出射端通过单模光纤跳线与第二偏振控制器(15)的入射端连接；所述第二偏振控制器(15)的出射端通过单模光纤跳线与偏振合束器(16)的入射端连接；The second exit end of the 1 × 2 fiber coupler (2) is connected to the entrance end of the second electro-optical modulator (10) through a single-mode fiber jumper; the signal of the second random light pulse generator (11) The output end is connected to the signal input end of the second electro-optical modulator (12); the output end of the second electro-optical modulator (12) is connected to the entrance end of the second optical isolator (12) through a single-mode fiber jumper; The exit end of the second optical isolator (12) is connected to one end of the delay fiber (13) through a single-mode fiber jumper, and the other end of the delay fiber (13) is connected to the second erbium-doped fiber amplifier (14) through a single-mode fiber jumper ); The output end of the second erbium-doped fiber amplifier (14) is connected to the entrance end of the second polarization controller (15) through a single-mode fiber jumper; the second polarization controller (15) The exit end of is connected to the entrance end of the polarization beam combiner (16) through a single-mode fiber jumper;
    所述保偏光纤(17)的两端分别与第一偏振控制器(9)的出射端和偏振合束器(16)的出射端连接。Both ends of the polarization maintaining fiber (17) are respectively connected to the output end of the first polarization controller (9) and the output end of the polarization beam combiner (16).
  2. 根据权利要求1所述的随机布里渊动态光栅的产生装置，其特征在于：所述1×2光纤耦合器(2)的耦合比为50∶50，所述保偏光纤(17)为熊猫型保偏光纤。The random Brillouin dynamic grating generating device according to claim 1, wherein the coupling ratio of the 1 × 2 fiber coupler (2) is 50:50, and the polarization maintaining fiber (17) is a panda Type PM fiber.
  3. 一种随机布里渊动态光栅的产生方法，该方法在权利要求1或2所述的随机布里渊动态光栅的产生装置中实现，该方法采用如下步骤实现：A method for generating a random Brillouin dynamic grating, the method is implemented in the random Brillouin dynamic grating generating device according to claim 1 or 2, the method is implemented by the following steps:
    激光源(1)输出激光经过1×2光纤耦合器(2)分成两路泵浦光源；The laser source (1) output laser is divided into two pump light sources through a 1 × 2 fiber coupler (2);
    第一路泵浦光经过第一电光调制器(3)后，被第一随机光脉冲发生器(4)调制为重复频率随机变化的随机光脉冲，重复频率随机变化的随机光脉冲经过第一光隔离器(5)、第一掺铒光纤放大器(6)进行放大，被放大的重复频率随机变化的随机光脉冲经微波源(8)控制的单边带调制器(7)作用后进行频移，频移的大小为保偏光纤(17)的布里渊频移量，频移后的重复频率随机变化的随机光脉冲再经过第一偏振控制器(9)进入保偏光纤(17)的一个光学主轴；After the first pump light passes through the first electro-optic modulator (3), it is modulated by the first random light pulse generator (4) into random light pulses with randomly varying repetition frequencies. The random light pulses with randomly varying repetition frequencies pass through the first The optical isolator (5) and the first erbium-doped fiber amplifier (6) are amplified, and the amplified random light pulse with randomly varying repetition frequency is subjected to the frequency after the action of the single sideband modulator (7) controlled by the microwave source (8) The magnitude of the frequency shift is the Brillouin frequency shift of the polarization-maintaining fiber (17), and the random light pulse with a randomly varying repetition frequency after the frequency shift passes through the first polarization controller (9) and enters the polarization-maintaining fiber (17) An optical spindle;
    第二路泵浦光经过第二电光调制器(10)后，被第二随机光脉冲发生器(11)调制为另一重复频率随机变化的随机光脉冲，重复频率随机变化的随机光脉冲依次经过第二光隔离器(12)、延迟光纤(13)、第二掺铒光纤放大器(14)、第二偏振控制器(15)、偏振合束器(16)进入保偏光纤(17) 的同一光学主轴；After the second pump light passes through the second electro-optic modulator (10), it is modulated by the second random light pulse generator (11) into another random light pulse with randomly varying repetition frequency. The random light pulses with randomly varying repetition frequency are in turn After entering the polarization maintaining fiber (17) through the second optical isolator (12), the delay fiber (13), the second erbium-doped fiber amplifier (14), the second polarization controller (15), and the polarization beam combiner (16) The same optical spindle;
    两路随机光脉冲泵浦光在保偏光纤(17)中相遇发生干涉效应，由此干涉后产生的信号光调制保偏光纤的折射率，形成随机布里渊动态光栅。The two random light pulse pump lights meet in the polarization-maintaining fiber (17) and an interference effect occurs. The signal light generated after the interference modulates the refractive index of the polarization-maintaining fiber to form a random Brillouin dynamic grating.
  4. 根据权利要求3所述的随机布里渊动态光栅的产生方法，其特征在于：所述重复频率随机变化的随机光脉冲的脉冲宽度为0.08ns。The method for generating a random Brillouin dynamic grating according to claim 3, characterized in that the pulse width of the random light pulse with randomly varying repetition frequency is 0.08 ns.
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