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WO2013016888A1 - Analyseur de domaine temporel optique de brillouin associé à une lumière laser chaotique - Google Patents

Analyseur de domaine temporel optique de brillouin associé à une lumière laser chaotique Download PDF

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Publication number
WO2013016888A1
WO2013016888A1 PCT/CN2011/079132 CN2011079132W WO2013016888A1 WO 2013016888 A1 WO2013016888 A1 WO 2013016888A1 CN 2011079132 W CN2011079132 W CN 2011079132W WO 2013016888 A1 WO2013016888 A1 WO 2013016888A1
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Prior art keywords
fiber
laser
chaotic laser
optical time
time domain
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PCT/CN2011/079132
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English (en)
Chinese (zh)
Inventor
孙忠周
张在宣
张文生
王剑锋
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Hangzhou Oe Tech Co Ltd
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Hangzhou Oe Tech Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
    • G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
    • G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
    • G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
    • G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
    • G01D5/35354—Sensor working in reflection
    • G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
    • G01D5/35364—Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
    • G01K11/322—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres using Brillouin scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/319—Reflectometers using stimulated back-scatter, e.g. Raman or fibre amplifiers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/39—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is projected from both sides of the fiber or waveguide end-face

Definitions

  • the invention relates to a chaotic laser-related Brillouin optical time domain analyzer, belonging to the technical field of distributed optical fiber sensors.
  • the technical solution of the invention is a chaotic laser-related Brillouin optical time domain analyzer, which is characterized in that: it is a chaotic laser correlation principle, coherently amplified Brillouin scattered light strain,
  • the fiber Brillouin optical time domain analyzer made by the temperature effect and the optical time domain reflection principle uses the same chaotic laser as the local reference source and pump signal source of the Brillouin optical time domain analyzer.
  • the random pulsed light pulse sequence in the time domain can improve the spatial resolution of the sensor system by centimeter level by the correlation processing of the back-direction light of the sensing fiber and the local reference light; the same chaotic laser is used.
  • the source overcomes the difficulty of the fiber Brillouin optical time domain analyzer to strictly lock the frequency of the probe laser and the pump laser, and improves the signal-to-noise ratio of the sensor system by 10 dB, which correspondingly increases the measurement length of the sensor by 50 km.
  • the chaotic laser-related Brillouin optical time domain analyzer includes a chaotic laser, a second optical fiber splitter, a light modulator, a first doped fiber amplifier, a second tunable optical attenuator, and a polarization scrambler.
  • the output end is connected to the input end of the second fiber optic splitter, and one output end of the second fiber optic splitter is connected to the optical modulator, and sequentially passes through the first doped fiber amplifier, the second dimmable optical attenuator, and the polarization interference
  • the mold, the polarization scrambler, the one-way device are connected to one end of the sensing fiber; the other output end of the second fiber splitter is connected to the second doped fiber amplifier, and the second fiber circulator and the sensing fiber are connected The other end is connected, the second fiber circulator is also connected to the third fiber circulator, and the third fiber circulator is further connected with a fiber grating reflection filter, and the output end of the third fiber circulator
  • Photo receiver module is connected, the output of the photo receiver module is connected to the digital signal processor and a computer.
  • the chaotic laser signal of the sensing fiber and the local reference light are heterodyne through the photoreceiver module, digital signal processor and computer, and related processing and fast Fourier transform demodulation are performed to obtain the space of the site where the 50km sensing fiber is located.
  • Strain and temperature information with a resolution of up to centimeter is transmitted to the remote monitoring network via the wireless network or the Internet.
  • the chaotic laser includes a semiconductor LD laser, a first polarization controller, a first fiber circulator, and a first fiber. a splitter, a first tunable optical attenuator and a second polarization controller; the semiconductor LD laser is connected to an input port of the first optical circulator via the first polarization controller, and the output end of the first optical circulator An optical fiber splitter input is connected, one output of the first optical splitter is connected to the output of the first dimmable optical attenuator, and passes through the second polarization controller and the other input end of the first optical circulator Connected to the semiconductor LD laser via the first polarization controller; the other output of the first fiber splitter is coupled to the input of the second fiber splitter.
  • the semiconductor LD laser is a DFB laser with an operating wavelength of 1550. Onm, the output power is 10 dBm; the branch ratio of the first fiber splitter is 20:80; The branch ratio of the second fiber splitter is 30:70.
  • the optical modulator is a Mach-Zehnder modulator (MZM) 0 computer controlled to reduce the frequency of the laser by ll GHz.
  • MZM Mach-Zehnder modulator
  • the sensing fiber is a 50km single mode communication G652 fiber or a 50km LEAF fiber.
  • the center wavelength of the fiber grating reflective filter is 1550. 08 nm, and the spectral bandwidth is 0.1 nm.
  • Other light can be filtered out, allowing the Stokes-stimulated Brillouin scattering signal light of the sensing fiber to be received and correlated with the local reference beam heterodyne through the third fiber circulator.
  • the photoreceiver module is composed of a photodetector, a preamplifier and a main amplifier having a frequency response of 2 Ghz or more.
  • the digital signal processor is a digital signal processor with an idle processing 5G sampling rate and a 500 MHz bandwidth with correlation processing and fast Fourier transform software.
  • Semiconductor lasers continuously generate randomly undulating ultra-wideband mixing when subjected to optical feedback
  • the chaotic laser has a correlation curve with a ⁇ function shape.
  • the bandwidth of the nonlinear chaotic oscillation of the semiconductor laser can be greater than 15 GHz, and the measurement of the ⁇ resolution and the ⁇ precision independent of the measurement length is realized.
  • the signal and reference light are collected, accumulated, correlated, and idling Fourier transform processed by a digital signal processor and a computer to obtain information on strain and temperature on the sensing fiber.
  • the bandwidth of the nonlinear chaotic oscillation, the bandwidth of the photoreceiver module and the digital processing system determine the spatial resolution of the Brillouin optical time domain analyzer, and the signal-to-noise ratio of the system determines the Brillouin optical time domain analyzer measurement. length.
  • the detecting laser of the incident optical fiber and the pumping laser generate a nonlinear interaction with the optical fiber.
  • the optical wave generates an acoustic wave by electrostriction, causing periodic modulation of the refractive index of the optical fiber (refractive index grating), and generating a frequency shifting downward.
  • the stimulated Brillouin scattered light, the frequency shift V ⁇ of the back Brillouin scattering produced in the fiber is:
  • ⁇ is the refractive index at the wavelength ⁇ of the incident light
  • V is the speed of sound in the fiber
  • the present invention adopts the chaotic laser correlation principle, and the chaotic laser has an ultra-wideband bandwidth, which is related to the signal light and the local reference light. Processing to obtain spatial resolution The rate effectively improves the reliability and spatial resolution of the sensor up to the centimeter level.
  • the pulse sequence of the chaotic laser increases the number of pump photons entering the sensing fiber, and improves the signal-to-noise ratio of the sensor system by 10 dB.
  • the measurement length of the Brillouin optical time domain analyzer can reach 50km.
  • the same chaotic laser as the local reference source and pump signal source of the Brillouin optical time domain analyzer also solves the locked narrowband detection laser and the narrowband pump laser. The difficulty has improved the stability of the system.
  • Figure 1 is a schematic view of the structure of the present invention.
  • a chaotic laser-related Brillouin optical time domain analyzer which is a fiber-optic Brillouin optical time domain made by using the chaotic laser correlation principle, coherently amplified Brillouin scattered light strain, temperature effect and optical time domain reflection principle.
  • the analyzer uses the same chaotic laser as the detection source and pump signal source of the Brillouin optical time domain analyzer.
  • It comprises a chaotic laser, a second fiber splitter 16, a light modulator 17, a first doped fiber amplifier 18, a second tunable attenuator 19, a polarization scrambler 20, a one-way device 21, a sensing fiber 22 a second doped fiber amplifier 23, a second fiber circulator 24, a third fiber circulator 25, a fiber grating reflection filter 26, a photoreceiver module 27, a digital signal processor 28, and a computer 29; the output of the chaotic laser The end is connected to the input end of the second fiber splitter 16, and one output of the second fiber splitter 16 is connected to the light modulator 17, and sequentially passes through the first doped fiber amplifier 18, the second dimmable attenuator 19.
  • the polarization scrambler 20, the polarization scrambler 20, the one-way device 21 are connected to one end of the sensing fiber 22; the other output end of the second fiber splitter 16 is connected to the second doped fiber amplifier 23, and Connected to the other end of the sensing fiber 22 via the second fiber circulator 24, the second fiber circulator 24 is also coupled to the third fiber circulator 25, and the third fiber circulator 25 is also connected to light.
  • the fiber grating reflection filter 26 is connected, the output of the third fiber circulator 25 is connected to the photoreceiver module 27, and the output of the photoreceiver module 27 is connected to the digital signal processor 28 and the computer 29.
  • the chaotic laser includes a semiconductor LD laser 10, a first polarization controller 11, a first fiber circulator 12, a first fiber splitter 13, a first tunable optical attenuator 14 and a second polarization controller 15; a semiconductor LD
  • the laser 10 is connected to an input port of the first fiber circulator 12 via the first polarization controller 11, and the output of the first fiber circulator 12 is connected to the input end of the first fiber splitter 13, the first fiber splitter
  • An output of the first adjustable optical attenuator 14 is connected to the output of the first tunable optical attenuator 14 and is coupled to the other input of the first optical circulator 12 via the second polarization controller 15, and is then fed back by the first polarization controller 11.
  • the semiconductor LD laser 10 is connected; the other output of the first fiber splitter 13 is connected to the input of the second fiber splitter 16.
  • the semiconductor LD laser 10 is a DFB laser with an operating wavelength of 1550. Onm, the output power is 10 dBm; the branch ratio of the first fiber splitter 13 is 20:80; and the branch ratio of the second fiber splitter 16 is 30: 70.
  • the light modulator 17 is a lithium niobate Mach-Zehnder modulator.
  • the sensing fiber 22 is a 50km single mode communication G652 fiber or a 50km LEAF fiber.
  • the nanometer wavelength of the fiber grating reflective filter 26 is 1550. 08 nm, and the spectral bandwidth is 0.1 nm.
  • the photoreceiver module 27 is composed of a photodetector, a preamplifier, and a main amplifier having a frequency response of 2 Ghz or more.
  • the digital signal processor 28 is a digital signal processor with an idle processing 5G sampling rate and a 500MHz bandwidth with associated processing and fast Fourier transform software.
  • the chaotic laser is divided into two turns by the optical fiber splitter, wherein one ultra-wideband chaotic laser is used as the local reference light, and the frequency of the laser is reduced by 11 GHz through the optical modulator, and the optical fiber amplifier is amplified by the optical fiber amplifier.
  • the scrambler enters the sensing fiber, another An ultra-wideband chaotic laser pulse sequence is passed through an erbium-doped fiber amplifier, and the second circulator enters the sensing fiber as a pump signal light, and the stimulated Brillouin V with back strain and temperature information in the sensing fiber.
  • V B passes through the fiber grating reflection filter and filters out v. , V. +v B , get ⁇ .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Optical Transform (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

L'invention concerne un analyseur de domaine temporel optique de Brillouin associé à une lumière laser chaotique constitué d'un analyseur de domaine temporel optique de Brillouin à fibre optique réalisé en utilisant des principes associés à des laser chaotiques, la déformation de l'amplification cohérente de la lumière diffusée par diffusion de Brillouin, l'effet de température et les principes de réflexion optique dans le domaine temporel, et utilise un même laser chaotique en tant que source de lumière de référence local et que source de lumière de signal de pompage pour l'analyseur de domaine temporel optique de Brillouin. Le laser chaotique présente une largeur de bande ultralarge. L'analyseur de domaine temporel optique de Brillouin associé à une lumière laser chaotique, en raison du fait qu'il utilise le principe du laser chaotique, effectue un traitement combiné d'une lumière de signal et d'une lumière locale afin d'obtenir une haute résolution spatiale, cela permettant d'augmenter efficacement la fiabilité d'un système de détection, la résolution spatiale pouvant atteindre le niveau du centimètre, et le nombre de photons de pompage qui pénètrent dans la fibre optique de détection étant également augmenté de telle sorte que le rapport signal à bruit du système de détection augmente de 10 dB et que la longueur de mesure d'un capteur peut être portée à 50 km. Grâce à l'utilisation d'un laser chaotique unique en tant que source de lumière de signal locale et que source de lumière de signal de pompage de l'analyseur de domaine temporel optique de Brillouin, on remédie également aux difficultés liées au verrouillage d'un laser de détection à bande étroite et d'un laser de pompage à bande étroite, cela améliorant par conséquent la stabilité du système.
PCT/CN2011/079132 2011-08-01 2011-08-30 Analyseur de domaine temporel optique de brillouin associé à une lumière laser chaotique Ceased WO2013016888A1 (fr)

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CN2011102179366A CN102322806B (zh) 2011-08-01 2011-08-01 一种混沌激光相关布里渊光时域分析器
CN201110217936.6 2011-08-01

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CN109782517B (zh) * 2019-01-25 2021-01-01 太原理工大学 激光显示中宽带混沌调制产生低相干光的方法及装置
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