WO2017054564A1 - 一种激光器相位噪声消除装置、***及方法 - Google Patents

一种激光器相位噪声消除装置、***及方法 Download PDF

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WO2017054564A1
WO2017054564A1 PCT/CN2016/091043 CN2016091043W WO2017054564A1 WO 2017054564 A1 WO2017054564 A1 WO 2017054564A1 CN 2016091043 W CN2016091043 W CN 2016091043W WO 2017054564 A1 WO2017054564 A1 WO 2017054564A1
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fiber
phase noise
arm
delay
laser phase
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PCT/CN2016/091043
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English (en)
French (fr)
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何祖源
樊昕昱
郭勇
朱松林
印永嘉
刘庆文
马麟
杜江兵
王彬
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中兴通讯股份有限公司
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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
    • G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
    • G01D3/028—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups mitigating undesired influences, e.g. temperature, pressure
    • 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
    • G01M11/02—Testing optical properties

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  • the present application relates to, but is not limited to, the field of optical fiber detection, and in particular, to a laser phase noise cancellation device, system and method.
  • OTDR Optical Time Domain Reflectometer
  • OFDR Optical Frequency Domain Reflectometer
  • OTDR technology is widely used due to its relatively simple implementation and long-distance distributed measurement.
  • the spatial resolution of OTDR technology can only reach the order of meters, which limits its applications in certain areas with high spatial resolution requirements, such as aerospace and building health monitoring.
  • the OFDR technology has a spatial resolution of the order of centimeters, but its detection distance is limited by the coherence length of the laser. When the measured distance exceeds the coherence length, the spatial resolution and signal-to-noise ratio drop sharply due to the influence of the laser phase noise.
  • the non-uniform fast Fourier transform can solve the problem of frequency domain non-uniform sampling due to laser phase noise, and can achieve theoretical spatial resolution, but its measurement distance cannot exceed the coherence length of the laser.
  • phase noise compensation OFDR technique and the OFDR phase noise compensation technique based on the de-slanting filter can realize distributed measurement of spatial resolution on the order of tens of kilometers.
  • Embodiments of the present invention provide a laser phase noise canceling apparatus, system, and method, which solve the problem that the optical frequency domain reflectometer technology has low spatial resolution for long distance measurement in the related art.
  • a laser phase noise canceling apparatus comprising a Mach-Zehnder interferometer, the phase noise canceling apparatus further comprising: a fiber delay loop, wherein the fiber delay loop is coupled to the Mach-Zehnder by a first optical coupler On the reference arm of the interferometer, the fiber delay loop includes a series of acousto-optic modulators and a predetermined length of delay fiber, wherein the predetermined length is less than or equal to the coherence length of the laser.
  • the fiber delay ring further includes: an erbium doped fiber amplifier and an optical band pass filter, wherein the erbium doped fiber amplifier, the optical band pass filter, the acousto-optic modulator, and the delay fiber Serially connected in series along the reference beam propagation direction on the reference arm; or reference to the erbium doped fiber amplifier, the optical bandpass filter, the delay fiber, and the acousto-optic modulator along the reference arm The beam propagation direction is connected in series.
  • the fiber delay ring further includes: an isolator configured to isolate the reverse beam, wherein the acousto-optic modulator, the delay fiber, and the isolator propagate along a reference beam on the reference arm The directions are serially connected in sequence; or the delay fiber, the acousto-optic modulator, and the isolator are sequentially connected in series along a reference beam propagation direction on the reference arm.
  • the Mach-Zehnder interferometer comprises: the reference arm, the detecting arm and the second optical coupler, wherein the second optical coupler and the input end of the reference arm and the detecting arm
  • the input terminal is connected to divide the frequency sweep signal generated by the external modulated swept source device into a reference beam and a probe beam, and send the reference beam to the reference arm, and send the probe beam to the probe arm
  • the probe arm includes a circulator including a first port, a second port, a third port, and a fourth port, wherein the first port is configured to receive the probe beam and to detect the probe beam Sending from the second port, the second port is configured to be connected to the fiber to be tested, the third port is configured to receive a backscattered light beam reflected by the fiber to be tested, and the fourth port is set to Transmitting the backscattered beam into a third optocoupler; an output of the reference arm coupled to the third optocoupler, configured to feed a reference beam on an output of the reference arm into the Third
  • the delay fiber is placed in a sound insulating medium.
  • the delay fiber is a single mode fiber having a length of 10 kilometers.
  • a laser phase noise canceling system comprising the above laser phase noise canceling device, an external modulated swept source device, and a photodetection and data acquisition module; wherein the external modulated swept source device, the laser phase noise canceling device, and The photodetection and data acquisition module is sequentially connected; the external modulation swept source device is configured to generate a swept beam; the photodetection and data acquisition module is configured to process the interference beam output by the laser phase noise canceling device .
  • the photodetection and data acquisition module comprises: a balanced photodetector and a data acquisition card connected to the balanced photodetector, wherein the balanced photodetector is configured to photoelectrically convert the interference beam
  • the data acquisition card is configured to convert the photoelectrically converted analog signal into a digital signal.
  • a laser phase noise cancellation method includes: circulating a reference beam coupled from a first optical coupler on a reference arm of a Mach-Zehnder interferometer into a fiber delay loop, and causing the reference beam to be in the fiber delay loop Each transmission in the transmission passes through a predetermined length of the delay fiber and performs a frequency shift of a predetermined frequency; a reference beam on the output end of the reference arm is sent to the third optical coupler, and the output end of the reference arm is made The upper reference beam interferes with the backscattered beam output from the detection arm of the Mach-Zehnder interferometer to obtain an interference beam; the interference beam is processed by a photodetection and data acquisition module.
  • a phase noise canceling device including a Mach-Zehnder interferometer and a fiber delay loop
  • the fiber delay loop is coupled to the reference arm of the Mach-Zehnder interferometer through the first optical coupler, and the optical fiber
  • the delay loop includes a series of acousto-optic modulators and a predetermined length of delay fiber, wherein the predetermined length is less than or equal to the coherence length of the laser, which solves the low spatial resolution of the long-distance measurement by the optical frequency domain reflectometer technology in the related art.
  • the problem is to improve the spatial resolution of long-distance measurements by optical frequency domain reflectometry.
  • FIG. 1 is a block diagram showing the structure of a laser phase noise canceling apparatus according to an embodiment of the present invention
  • FIG. 2 is a first schematic diagram of a laser phase noise cancellation principle according to an embodiment of the present invention
  • FIG. 3 is a second schematic diagram of a laser phase noise cancellation principle according to an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the structure of a laser phase noise canceling system according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of a laser phase noise canceling method according to an embodiment of the present invention.
  • FIG. 6 is a structural block diagram of an OFDR system in accordance with a preferred embodiment of the present invention.
  • FIG. 9 is a comparison diagram of measurement results of spatial resolution before and after compensation in accordance with an alternative embodiment of the present invention.
  • FIG. 1 is a structural block diagram of a laser phase noise canceling apparatus according to an embodiment of the present invention.
  • the apparatus includes a Mach-Zehnder interferometer, and The apparatus further includes: an optical fiber delay loop (OFDL), wherein the fiber delay loop is coupled to the reference arm of the Mach-Zehnder interferometer through the first optical coupler (OC2), and the optical delay loop includes a series of acousto-optic modulators ( AOM) and a predetermined length of retardation fiber, wherein the predetermined length is no greater than the coherence length of the laser.
  • ODFDL optical fiber delay loop
  • AOM acousto-optic modulators
  • the laser phase noise canceling apparatus provided by the embodiment of the present invention can solve the problem of phase noise of a light source existing in the conventional OFDR technology. .
  • the acousto-optic modulator ie, the frequency shifter
  • the acousto-optic modulator operate at a frequency that indicates the frequency of the beam that the acousto-optic modulator will pass each time; the length of the delay fiber in the OFDL is .
  • the N ⁇ f FS signal appearing in the frequency domain represents that the reference beam has passed N times in the OFDL, and the length of the corresponding reference fiber is N ⁇ 1.
  • the fiber to be tested FUT
  • the length is shown in Figure 3, which is the length of the delay fiber in the OFDL
  • L is the length of the fiber to be tested.
  • the optical path difference (OPD) of each scattering point on the fiber to be tested is smaller than the coherence length of the laser. Therefore, the scattering information of each point on the fiber to be tested can be accurately obtained, the influence of phase noise is eliminated, and the OFDR technology is extended. Measuring range.
  • the laser phase noise canceling device provided by the embodiment of the present invention can eliminate the influence of phase noise, and solve the problem that the optical frequency domain reflectometer technology has low spatial resolution for long distance measurement in the related art, and the optical frequency domain is improved.
  • the spatial resolution of the reflectometer technology for long distance measurements can eliminate the influence of phase noise, and solve the problem that the optical frequency domain reflectometer technology has low spatial resolution for long distance measurement in the related art, and the optical frequency domain is improved. The spatial resolution of the reflectometer technology for long distance measurements.
  • an erbium doped fiber amplifier and an optical bandpass filter may be added at the reference beam entrance of the fiber delay loop, wherein the optical bandpass filter is set to filter out Amplified spontaneous emission (ASE) noise from ⁇ fiber amplifiers.
  • the erbium-doped fiber amplifier, the optical bandpass filter, the acousto-optic modulator, and the delay fiber are sequentially connected in series along the reference beam propagation direction on the reference arm; or the erbium doped fiber amplifier, the optical bandpass filter, and the delay
  • the fiber optic and acousto-optic modulators are connected in series along the direction of propagation of the reference beam on the reference arm. That is, the serial order of the acousto-optic modulator and the delay fiber can be reversed.
  • the isolator is isolated in series at the end of the fiber delay loop, that is, the light delay loop before the reference beam re-enters the reference arm (Isolator)
  • the acousto-optic modulator, the delay fiber, and the isolator are sequentially connected in series along the reference beam propagation direction on the reference arm; or the delay fiber, the acousto-optic modulator, and the isolator are sequentially connected in the direction of the reference beam propagation on the reference arm. .
  • the isolator Through the isolator, the effect of reflected light on the delayed fiber is avoided.
  • the Mach-Zehnder interferometer comprises: a reference arm, a detecting arm and a second optical coupler (OC1), wherein the second optical coupler is connected to the input end of the reference arm and the input end of the detecting arm, and is set to
  • the sweep signal generated by the external modulated swept source device is divided into a reference beam and a probe beam, and the reference beam is sent to the reference arm, and the probe beam is sent to the probe arm;
  • the probe arm includes a circulator (CIR),
  • the circulator includes a first port, a second port, a third port, and a fourth port, wherein the first port is configured to receive the probe beam and send the probe beam from the second port, and the second port is configured to be connected to the fiber to be tested,
  • the third port is configured to receive the backscattered beam reflected by the fiber to be tested, and the fourth port is configured to feed the backscattered beam into the third optical coupler (OC3); the output of the reference arm and the third optical coupler
  • the reference beam of the reference fiber of the predetermined length of the predetermined length can be obtained in different frequency domains, thereby accurately segmenting the segments of the fiber to be tested in a segmented form. Measurement; finally, the measurement results of each segment are combined to obtain the measurement result of the fiber to be tested.
  • the fiber-optic FUT pigtail of the fiber to be tested adopts a PC/APC interface.
  • the delay fiber is placed in the soundproof medium, for example, the delay fiber is placed in the soundproof box.
  • the predetermined length of the delay fiber may be selected to be no longer than the length of the coherence length.
  • the delay fiber has a length of 10 thousand. Meter's single mode fiber.
  • FIG. 4 is a structural block diagram of a laser phase noise cancellation system according to an embodiment of the present invention.
  • the system includes the laser phase noise cancellation device 41 described above.
  • the externally modulated swept source device 42 and the photodetection and data acquisition module 43 are in turn, wherein the externally modulated swept source device 41, the laser phase noise canceling device 42 and the photodetection and data acquisition module 43 are sequentially connected; the externally modulated swept source device 41 It is arranged to generate a swept beam; the photodetection and data acquisition module 43 is arranged to process the interfering beam output by the laser phase noise canceling device.
  • the photodetection and data acquisition module 43 comprises: a balanced photodetector and a data acquisition card connected to the balanced photodetector, wherein the balanced photodetector is configured to photoelectrically convert the interference beam; the data acquisition card is set to be The analog signal obtained by photoelectric conversion is converted into a digital signal.
  • FIG. 5 is a flowchart of a laser phase noise canceling method according to an embodiment of the present invention. As shown in FIG. 5, the flow includes steps S501-S503:
  • Step S501 circulating a reference beam coupled from the first optical coupler on the reference arm of the Mach-Zehnder interferometer into the fiber delay loop, so that each transmission of the reference beam in the fiber delay loop is delayed by a predetermined length.
  • the fiber is subjected to a frequency shift of a predetermined frequency.
  • Step S502 the reference beam on the output end of the reference arm is sent to the third optical coupler, so that the reference beam on the output end of the reference arm interferes with the backscattered beam outputted by the detecting arm of the Mach-Zehnder interferometer. An interference beam is obtained.
  • step S503 the interference beam is processed by the photodetection and data acquisition module.
  • An alternative embodiment of the present invention provides a long-distance optical frequency domain reflectometer technology method and apparatus, and relates to an optical frequency domain reflectometer technology in the field of distributed optical fiber sensing, which aims to compensate a light source phase in an optical frequency domain reflectometer technology. Noise, enabling long-distance fiber distributed sensing.
  • an optical fiber delay ring is added to the Mach-Zehnder interferometer reference arm in the OFDR system, the OFDL comprising a roll of 10 km fiber and an acousto-optic modulation operating at f FS (ie frequency shifter). Therefore, the interference signal corresponding to the reference light of the N-turn in the OFDL appears near the frequency N ⁇ f FS , so that the signals at different positions on the detection fiber can be accurately obtained at different frequencies.
  • the pre-validation experiment achieves a spatial resolution of 11cm within the measurement range of 20km, and does not require complicated post-data processing. The spatial resolution is improved by nearly 40 times compared with the phase noise compensation.
  • FIG. 6 is a structural block diagram of an OFDR system according to an alternative embodiment of the present invention, and the symbols in FIG. 6 have the following meanings:
  • FL narrow linewidth fiber laser
  • SSB-modulator single sideband modulator
  • RF-Synthesizer RF synthesizer
  • EDFA erbium doped fiber amplifier
  • BPF optical bandpass filter
  • OC optical coupler
  • Isolator light Isolator
  • AOM acousto-optic modulator
  • CIR optical circulator
  • PC polarization controller
  • BPD balanced photodetector
  • ADC digital-to-analog converter
  • Delay fiber delay fiber
  • Box soundproof box
  • Trigger source Trigger source.
  • the OFDR system includes: an external modulation swept source, a Mach-Zehnder interferometer, an optical delay loop (OFDL), photodetection and data. Acquisition module; where:
  • Externally modulated swept source devices can include narrow linewidth fiber lasers, RF synthesizers, single sideband modulators, erbium doped fiber amplifiers (EDFAs), and optical bandpass filters.
  • RF synthesizers can include narrow linewidth fiber lasers, RF synthesizers, single sideband modulators, erbium doped fiber amplifiers (EDFAs), and optical bandpass filters.
  • EDFAs erbium doped fiber amplifiers
  • the narrow linewidth fiber laser has a working wavelength of 1550 nm
  • the RF synthesizer generates a frequency sweeping electrical signal
  • the radio frequency signal is modulated onto the optical signal by a single sideband modulator to generate a swept optical signal.
  • the maximum gain of the EDFA is 22dB, which is set to compensate for the insertion loss caused by the modulator.
  • the minimum bandwidth of the optical bandpass filter is 0.08nm and the insertion loss is 5dB.
  • the optical bandpass filter is set to filter out the amplified spontaneous emission caused by the EDFA ( ASE) noise.
  • the modulation bandwidth of the single sideband modulator exceeds 35 GHz
  • the sideband suppression ratio of the single frequency signal is more than 25 dB
  • the sideband suppression ratio of the frequency sweeping signal is more than 20 dB.
  • the Mach-Zehnder interferometer can include two optocouplers (50/50 size), a circulator, a fiber to be tested (FUT), and a polarization controller.
  • the 50/50 optical coupler divides the optical signal into a reference beam and a probe beam, the reference light passes through the OFDL to the second optical coupler, the probe light enters the fiber to be tested through the circulator, and the backscattered light enters from the circulator 2 port.
  • the second optocoupler interferes with the reference light, and the polarization controller is used to adjust the polarization state of the reference light.
  • Fiber Delay Loop can include: 10km delay fiber, acousto-optic modulator (AOM), erbium doped fiber amplifier (EDFA), and optical bandpass filters.
  • the 10km delay fiber is set to compensate the phase noise of the light source, and is placed in the soundproof box in order to eliminate external environmental interference.
  • the AOM produces a fixed frequency offset from which the number of turns of light in the OFDL can be known.
  • the EDFA is set to compensate for the power loss in the loop, and the optical filter is set to filter out the ASE noise from the EDFA.
  • the delay fiber insertion loss is 3 dB; the AOM operating frequency is 40 MHz and the insertion loss is 4 dB.
  • Photoelectric detection and data acquisition modules include: balanced photodetectors and 8-bit data acquisition cards.
  • the balanced photodetector is set to photoelectric conversion, and the data acquisition card digitally converts the analog signal for later data processing.
  • the balanced photodetector has a bandwidth of 1.6 GHz and the data acquisition card has a sampling rate of 1 GHz.
  • the laser phase noise cancellation method will be described and illustrated using an example based on the OFDR system shown in FIG.
  • the laser produces seed light with a wavelength of 1550 nm.
  • the RF synthesizer generates an RF signal with a sweep frequency range of 1 GHz and a sweep rate of 100 GHz/s.
  • the sweep signal is modulated onto the seed light by a single sideband modulator.
  • the single sideband modulator outputs swept light in the 1 GHz frequency range and corresponds to a theoretical spatial resolution of 10 cm in the OFDR.
  • the Swept Light is amplified by the EDFA, the ASE noise is filtered out by an optical filter and split into two paths through a 50/50 coupler. One way is to probe light, enter the fiber to be tested through the circulator, and the other is reference light. After the OFDL, the backscattered signal is coherent in the second coupler.
  • the photodetector converts the optical signal into an electrical signal, the analog signal is digitized by an analog-to-digital converter, and the RF synthesizer and the data acquisition card are synchronized by an external signal source. Fourier transforming the acquired time domain signal yields a distributed backscattered signal along the measurement fiber without the need for complex phase compensation processes.
  • the OFDL consists of a 10km delay fiber and an acousto-optic modulator (AOM) that operates at a frequency shift.
  • AOM operates at 40MHz and the isolator is set to eliminate reverse light.
  • the delay fiber is placed in the soundproof box.
  • the delay fiber insertion loss is 3dB
  • the AOM insertion loss is 4dB
  • the insertion loss is about 9dB for the entire loop including the connector.
  • an EDFA is used in the loop, and the optical filter is used to filter out the ASE noise of the EDFA.
  • the fiber to be tested is two rolls of 10km single mode fiber (SMF) connected by a fiber optic connector.
  • Figure 7 shows the backscattering information near the first fiber optic connector.
  • the graph in the upper left corner of Fig. 7 is an enlarged view of the Fresnel reflection peak.
  • the spatial resolution of 35 cm in the figure is the spatial resolution of the Fresnel reflection peak before compensation, and the spatial resolution of 10 cm is the compensated Fresnel reflection peak.
  • Spatial resolution The spatial resolution of the measured fiber-optic joint Fresnel reflection peak is 35 cm due to the influence of phase noise before compensation.
  • the frequency domain is 80 MHz (double the AOM operating frequency).
  • the Fresnel reflection peak produced by the first fiber connector was obtained nearby, and the reference light was circled twice in the OFDL and coherent with the signal light.
  • the spatial resolution is 10 cm, which is consistent with the theoretical spatial resolution.
  • the Fresnel reflection peak of the fiber end connector to be tested near 160 MHz, and the reference light was surrounded by the signal light in the OFDL.
  • the spatial resolution of 380 cm in FIG. 8 is the spatial resolution of the Fresnel reflection peak before compensation
  • the spatial resolution of 11 cm is the spatial resolution of the compensated Fresnel reflection peak.
  • the compensation is obtained.
  • the spatial resolution of the reflected peak is 11 cm, which is basically consistent with the theoretical spatial resolution.
  • the source phase noise compensation method proposed by the alternative embodiment of the present invention increases the spatial resolution by 40 times compared to the 380 cm spatial resolution before compensation.
  • the source phase noise compensation method proposed by the alternative embodiment of the present invention has the worst compensation effect at ML/4 (where M is an odd number and L is a delay fiber length).
  • M is an odd number and L is a delay fiber length.
  • the optical path difference of the two arms of the Mach-Zehnder interferometer is.
  • the phase noise compensation before and after compensation is measured respectively, and the length is 5km and 8.1km (since the laboratory does not have 7.5)
  • the km length fiber, using 8.1km fiber instead of) 10km, 12.5km, 15km, 17.5km and 20km fiber, and recording the spatial resolution of the end Fresnel reflection peak.
  • the measurement results are shown in Fig. 9.
  • the spatial resolution in accordance with the theory is also obtained. Among them, all the measurements in Figure 9 were performed 10 times and averaged.
  • the laser phase noise cancellation scheme provided by the embodiment of the present invention can compensate the phase noise of the light source in the OFDR technology, and realize the distributed measurement of the spatial resolution of the centimeter level in the measurement range of several tens of kilometers or even hundreds of kilometers.
  • a computer readable storage medium storing computer executable instructions that, when executed by a processor, implement the laser phase noise cancellation method.
  • each module or step of the above-described embodiments of the present invention can be implemented by a general-purpose computing device, which can be centralized on a single computing device or distributed across multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different.
  • the steps shown or described herein are performed sequentially, or they are separately fabricated into a plurality of integrated circuit modules, or a plurality of the modules or steps are fabricated into a single integrated circuit module.
  • embodiments of the invention are not limited to any specific combination of hardware and software.
  • a phase noise canceling device including a Mach-Zehnder interferometer and a fiber delay loop
  • the fiber delay loop is coupled to the reference arm of the Mach-Zehnder interferometer through the first optical coupler, and the optical fiber
  • the delay loop includes a series of acousto-optic modulators and a predetermined length of delay fiber, wherein the predetermined length is less than or equal to the coherence length of the laser, which solves the low spatial resolution of the long-distance measurement by the optical frequency domain reflectometer technology in the related art.
  • the problem is to improve the spatial resolution of long-distance measurements by optical frequency domain reflectometry.

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Abstract

一种激光器相位噪声消除装置、***及方法。该装置包括：马赫-曾德尔干涉仪和光纤延迟环，其中，光纤延迟环通过第一光耦合器耦合在马赫-曾德尔干涉仪的参考臂上，光纤延迟环包括串接的声光调制器和预定长度的延迟光纤，其中，预定长度小于或等于激光器的相干长度。

Description

一种激光器相位噪声消除装置、***及方法 技术领域
本申请涉及但不限于光纤检测领域，尤其涉及一种激光器相位噪声消除装置、***及方法。
背景技术
近年来，光反射仪技术由于其能够实现分布式测量，吸引了越来越多的关注。主要包括光时域反射仪技术(Optical Time Domain Reflectometer，简称为OTDR)和光频域反射仪技术(Optical Frequency Domain Reflectometer，简称为OFDR)。其中OTDR技术由于实现比较简单并且能够实现长距离分布式测量而得到广泛应用。然而，OTDR技术的空间分辨率只能达到米量级，从而限制了它在某些具有高空间分辨率需求领域的应用，例如航天航空领域和建筑物健康监测。相比之下，OFDR技术空间分辨率能够达到厘米量级，但是其探测距离受限于激光器的相干长度。当测量距离超过相干长度时，由于激光器相位噪声的影响，空间分辨率和信噪比会急剧下降。
为了消除激光器相位噪声的影响，实现更长的测量范围，国内外学者提出了几种OFDR改进方法。
例如，非均匀快速傅里叶变换，能够解决由于激光器相位噪声带来的频域非均匀采样问题，能够实现理论的空间分辨率，但是其测量距离不能超过激光器的相干长度。
又例如，相位噪声补偿OFDR技术和基于去斜滤波器的OFDR相位噪声补偿技术，能够实现数十公里上厘米量级空间分辨率分布式测量。
但是上述两种方法都是通过软件数据处理实现相位噪声补偿的，需要大量的计算才能获得测量结果，实现复杂。
针对相关技术中光频域反射仪技术对长距离测量的空间分辨率低的问题，目前尚未提出有效的解决方案。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求 的保护范围。
本发明实施例提供了一种激光器相位噪声消除装置、***及方法，解决了相关技术中光频域反射仪技术对长距离测量的空间分辨率低的问题。
一种激光器相位噪声消除装置，包括马赫-曾德尔干涉仪，所述相位噪声消除装置还包括：光纤延迟环，其中，所述光纤延迟环通过第一光耦合器耦合在所述马赫-曾德尔干涉仪的参考臂上，所述光纤延迟环包括串接的声光调制器和预定长度的延迟光纤，其中，所述预定长度小于或等于激光器的相干长度。
可选地，所述光纤延迟环还包括：掺铒光纤放大器和光带通滤波器，其中，所述掺铒光纤放大器、所述光带通滤波器、所述声光调制器和所述延迟光纤沿所述参考臂上的参考光束传播方向依次串接；或者所述掺铒光纤放大器、所述光带通滤波器、所述延迟光纤和所述声光调制器沿所述参考臂上的参考光束传播方向依次串接。
可选地，所述光纤延迟环还包括：设置为隔离反向光束的隔离器，其中，所述声光调制器、所述延迟光纤和所述隔离器沿所述参考臂上的参考光束传播方向依次串接；或者所述延迟光纤、所述声光调制器和所述隔离器沿所述参考臂上的参考光束传播方向依次串接。
可选地，所述马赫-曾德尔干涉仪包括：所述参考臂、探测臂和第二光耦合器，其中，所述第二光耦合器与所述参考臂的输入端和所述探测臂的输入端连接，设置为将外部调制扫频光源装置生成的扫频信号分成参考光束和探测光束，并将所述参考光束送入所述参考臂，将所述探测光束送入所述探测臂；所述探测臂包括环形器，所述环形器包括第一端口、第二端口、第三端口和第四端口，其中，所述第一端口设置为接收所述探测光束并将所述探测光束从所述第二端口送出，所述第二端口设置为与待测光纤连接，所述第三端口设置为接收由所述待测光纤反射回来的背向散射光束，所述第四端口设置为将所述背向散射光束送入第三光耦合器；所述参考臂的输出端与所述第三光耦合器连接，设置为将所述参考臂的输出端上的参考光束送入所述第三光耦合器，令所述参考臂的输出端上的参考光束与所述背向散射光束相干涉。
可选地，所述延迟光纤放置在隔音介质中。
可选地，所述延迟光纤为长度为10千米的单模光纤。
一种激光器相位噪声消除***，包括上述的激光器相位噪声消除装置、外部调制扫频光源装置和光电探测和数据采集模块；其中，所述外部调制扫频光源装置、所述激光器相位噪声消除装置和所述光电探测和数据采集模块依次连接；所述外部调制扫频光源装置设置为生成扫频光束；所述光电探测和数据采集模块设置为对所述激光器相位噪声消除装置输出的干涉光束进行处理。
可选地，所述光电探测和数据采集模块包括：平衡光电探测器和与所述平衡光电探测器连接的数据采集卡，其中，所述平衡光电探测器设置为对所述干涉光束进行光电转换；所述数据采集卡设置为将光电转换得到的模拟信号转换为数字信号。
一种激光器相位噪声消除方法，包括：将从马赫-曾德尔干涉仪的参考臂上第一光耦合器耦合出的参考光束循环送入光纤延迟环，令所述参考光束在所述光纤延迟环中的每次传输都经过预定长度的延迟光纤并进行预定频率的频移；将所述参考臂的输出端上的参考光束送入所述第三光耦合器，令所述参考臂的输出端上的参考光束与所述马赫-曾德尔干涉仪的探测臂输出的背向散射光束相干涉，得到干涉光束；通过光电探测和数据采集模块对所述干涉光束进行处理。
通过本发明实施例方案，采用包括马赫-曾德尔干涉仪和光纤延迟环的相位噪声消除装置，其中，光纤延迟环通过第一光耦合器耦合在马赫-曾德尔干涉仪的参考臂上，光纤延迟环包括串接的声光调制器和预定长度的延迟光纤，其中，预定长度小于或等于激光器的相干长度，解决了相关技术中光频域反射仪技术对长距离测量的空间分辨率低的问题，提高了光频域反射仪技术对长距离测量的空间分辨率。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1是根据本发明实施例的激光器相位噪声消除装置的结构框图；
图2是根据本发明实施例的激光器相位噪声消除原理的示意图一；
图3是根据本发明实施例的激光器相位噪声消除原理的示意图二；
图4是根据本发明实施例的激光器相位噪声消除***的结构框图；
图5是根据本发明实施例的激光器相位噪声消除方法的流程图；
图6是根据本发明优选实施例的OFDR***的结构框图；
图7是根据本发明可选实施例的补偿前后背向散射信息的测量结果对比图一；
图8是根据本发明可选实施例的补偿前后背向散射信息的测量结果对比图二；
图9是根据本发明可选实施例的补偿前后空间分辨率的测量结果对比图。
本发明的实施方式
下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，本发明实施例的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
本实施例提供了一种激光器相位噪声消除装置，图1是根据本发明实施例的激光器相位噪声消除装置的结构框图，如图1所示，该装置包括马赫-曾德尔干涉仪，此外，该装置还包括：光纤延迟环(OFDL)，其中，光纤延迟环通过第一光耦合器(OC2)耦合在马赫-曾德尔干涉仪的参考臂上，光纤延迟环包括串接的声光调制器(AOM)和预定长度的延迟光纤，其中，预定长度不大于激光器的相干长度。
图2是根据本发明实施例的激光器相位噪声消除原理的示意图一，如图2所示，基于本发明实施例提供的激光器相位噪声消除装置，可以解决针对传统OFDR技术存在的光源相位噪声的问题。
设声光调制器(即移频器)的工作频率为，表示声光调制器每次将通过的光束的频率偏移；OFDL中延迟光纤的长度为。
那么，频域上出现的N×fFS信号，代表参考光束在OFDL中经过了N次，对应的参考光纤的长度为N×1。如果将待测光纤(FUT)等效分成很多小段，长度如图3所示，为OFDL中延迟光纤的长度，L为待测光纤的长度。此时第一段(Seg 1)的信息可以在频域0HZ附近获得，第二段(Seg 2)的信息可以在频域2×fFS附近获得，以此类推，第N段(Seg N)的信息可以在N×fFS附近获得。
可见，待测光纤上每一个散射点的光程差(OPD)均小于激光器的相干长度，因此，可以准确的获得待测光纤上每个点的散射信息，消除相位噪声的影响，延长OFDR技术的测量范围。
因此，通过本发明实施例提供的激光器相位噪声消除装置，可以消除相位噪声的影响，解决了相关技术中光频域反射仪技术对长距离测量的空间分辨率低的问题，提高了光频域反射仪技术对长距离测量的空间分辨率。
可选地，为了补偿在光纤延迟环中参考光束的功率损耗，在光纤延迟环的参考光束入口出可以增加掺铒光纤放大器和光带通滤波器，其中，光带通滤波器设置为滤除掺铒光纤放大器带来的放大自发辐射(ASE)噪声。在光纤延迟环中，掺铒光纤放大器、光带通滤波器、声光调制器和延迟光纤沿参考臂上的参考光束传播方向依次串接；或者掺铒光纤放大器、光带通滤波器、延迟光纤和声光调制器沿参考臂上的参考光束传播方向依次串接。即，声光调制器和延迟光纤的串接次序可以对调。
可选地，为了消除参考臂上的反射光对光线延迟环的影响，在光纤延迟环的末端，即参考光束重新进入参考臂之前的光线延迟环上串接隔离反向光束的隔离器(Isolator)；例如，声光调制器、延迟光纤和隔离器沿参考臂上的参考光束传播方向依次串接；或者延迟光纤、声光调制器和隔离器沿参考臂上的参考光束传播方向依次串接。通过隔离器，避免了反射光对延迟光纤的影响。
可选地，马赫-曾德尔干涉仪包括：参考臂、探测臂和第二光耦合器(OC1)，其中，第二光耦合器与参考臂的输入端和探测臂的输入端连接，设置为将外部调制扫频光源装置生成的扫频信号分成参考光束和探测光束，并将参考光束送入参考臂，将探测光束送入探测臂；探测臂包括环形器(CIR)， 环形器包括第一端口、第二端口、第三端口和第四端口，其中，第一端口设置为接收探测光束并将探测光束从第二端口送出，第二端口设置为与待测光纤连接，第三端口设置为接收由待测光纤反射回来的背向散射光束，第四端口设置为将背向散射光束送入第三光耦合器(OC3)；参考臂的输出端与第三光耦合器连接，设置为将参考臂的输出端上的参考光束送入第三光耦合器，令参考臂的输出端上的参考光束与背向散射光束相干涉。在第三光耦合器耦合出的干涉光束中，可以在不同的频域上获得预定长度的整数倍长度的参考光纤的参考光束，从而通过分段的形式将待测光纤的各个分段进行精确测量；最后将各个分段的测量结果进行合并，即得到对待测光纤的测量结果。
可选地，待测光纤FUT尾纤采用PC/APC接口。
可选地，为了消除外界环境对延迟光纤的干扰，延迟光纤放置在隔音介质中，例如延迟光纤被放置在隔音箱中。
可选地，根据激光器相干长度的不同，延迟光纤的预定长度可以选择不长于该相干长度的长度值，例如，对于相干长度大于或者等于10千米的激光器而言，延迟光纤为长度为10千米的单模光纤。
本实施例还提供了一种激光器相位噪声消除***，图4是根据本发明实施例的激光器相位噪声消除***的结构框图，如图4所示，该***包括上述的激光器相位噪声消除装置41、外部调制扫频光源装置42和光电探测和数据采集模块43，其中，外部调制扫频光源装置41、激光器相位噪声消除装置42和光电探测和数据采集模块43依次连接；外部调制扫频光源装置41设置为生成扫频光束；光电探测和数据采集模块43设置为对激光器相位噪声消除装置输出的干涉光束进行处理。
可选地，光电探测和数据采集模块43包括：平衡光电探测器和与平衡光电探测器连接的数据采集卡，其中，平衡光电探测器设置为对干涉光束进行光电转换；数据采集卡设置为将光电转换得到的模拟信号转换为数字信号。
本实施例还提供了一种激光器相位噪声消除方法，图5是根据本发明实施例的激光器相位噪声消除方法的流程图，如图5所示，该流程包括步骤S501-S503：
步骤S501，将从马赫-曾德尔干涉仪的参考臂上第一光耦合器耦合出的参考光束循环送入光纤延迟环，令参考光束在光纤延迟环中的每次传输都经过预定长度的延迟光纤并进行预定频率的频移。
步骤S502，将参考臂的输出端上的参考光束送入第三光耦合器，令参考臂的输出端上的参考光束与马赫-曾德尔干涉仪的探测臂输出的背向散射光束相干涉，得到干涉光束。
步骤S503，通过光电探测和数据采集模块对干涉光束进行处理。
为了使本发明实施例的描述更加清楚，下面结合可选实施例进行描述和说明。
本发明可选实施例提供了一种长距离光频域反射仪技术方法及装置，涉及分布式光纤传感领域中的光频域反射仪技术，目的是补偿光频域反射仪技术中光源相位噪声，实现长距离光纤分布式传感。
在本发明可选实施例中，在OFDR***中的马赫-曾德尔干涉仪参考臂上加入一个光纤延迟环(OFDL)，OFDL包括一卷10km的光纤和一个工作频率为fFS的声光调制器(即移频器)。因此，在OFDL中环绕了N圈的参考光对应的干涉信号会出现在频率N×fFS附近，从而探测光纤上不同位置的信号可以在不同的频率上准确的获得。通过这种方法，前期验证实验实现了20km测量范围内，11cm的空间分辨率，不需要复杂的后期数据处理过程，空间分辨率相对于相位噪声补偿前提高了接近40倍。
图6是根据本发明可选实施例的OFDR***的结构框图，图6中个符号含义如下：
FL：窄线宽光纤激光器；SSB-modulator：单边带调制器；RF-Synthesizer：射频合成器；EDFA：掺铒光纤放大器；BPF：光带通滤波器；OC：光耦合器；Isolator：光隔离器；AOM：声光调制器；CIR：光环形器；PC：偏振控制器；BPD：平衡光电探测器；ADC：数模转换器；Delay fiber：延迟光纤；Box：隔音箱；Trigger source：触发源。
如图6所示，该OFDR***包括：外部调制扫频光源，马赫-曾德尔干涉仪(Mach-Zehnder interferometer)，光纤延迟环(OFDL)，光电探测和数据 采集模块；其中：
外部调制扫频光源装置可以包括：窄线宽光纤激光器、射频合成器，单边带调制器，掺铒光纤放大器(EDFA)和光带通滤波器。
可选地，所述窄线宽光纤激光器工作波长为1550nm，射频合成器产生扫频电信号，通过单边带调制器将射频信号调制到光信号上去，产生扫频光信号。EDFA最大增益为22dB，设置为补偿调制器带来的***损耗，光带通滤波器最小带宽为0.08nm，***损耗为5dB，光带通滤波器设置为滤除EDFA带来的放大自发辐射(ASE)噪声。
可选地，单边带调制器调制带宽超过35GHz，单频信号边带抑制比达到25dB以上，扫频信号边带抑制比达到20dB以上。
马赫-曾德尔干涉仪可以包括：两个光耦合器(规格为50/50)、环形器、待测光纤(FUT)和偏振控制器。
所述50/50光耦合器将光信号分成参考光束和探测光束，参考光经过OFDL到达第二个光耦合器，探测光通过环形器进入待测光纤，背向散射光从环形器2端口进入第二个光耦合器和参考光进行干涉，偏振控制器用来调节参考光的偏振态。
光纤延迟环(OFDL)可以包括：10km延迟光纤、声光调制器(AOM)、掺铒光纤放大器(EDFA)和光带通滤波器。
所述10km延迟光纤设置为补偿光源的相位噪声，为了消除外界环境干扰，将其放入隔音箱中。AOM产生固定频率偏移，通过频率偏移量可以知道光在OFDL中环绕的圈数。EDFA设置为补偿环路中的功率损耗，光滤波器设置为滤除EDFA带来的ASE噪声。
可选地，延迟光纤***损耗为3dB；AOM工作频率为40MHz，***损耗为4dB。
光电探测和数据采集模块包括：平衡光电探测器和8-bit数据采集卡。
所述平衡光电探测器设置为光电转换，数据采集卡将模拟信号进行数字转换用于后期数据处理。可选地，平衡光电探测器带宽为1.6GHz，数据采集卡采样率设为1GHz。
下面基于图6所示的OFDR***，采用一个实例对激光器相位噪声消除方法进行描述和说明。
激光器产生波长为1550nm的种子光。射频合成器产生扫频范围为1GHz的射频信号，扫频速度为100GHz/s，通过单边带调制器，将扫频信号调制到种子光上。单边带调制器输出为1GHz频率范围的扫频光，在OFDR中对应10cm的理论空间分辨率。扫频光经过EDFA放大后，用光滤波器滤除ASE噪声，经过50/50耦合器分成两路。一路为探测光，通过环形器进入待测光纤，另一路为参考光，经过OFDL后和背向散射信号在第二个耦合器相干。光电探测器将光信号转换为电信号，模拟信号通过模数转换器进行数字化，用外部信号源对射频合成器和数据采集卡进行同步。对采集的时域信号进行傅里叶变换即可得到沿测量光纤的分布式背向散射信号，而不需要复杂的相位补偿过程。
OFDL包含一卷10km的延迟光纤和一个起移频作用的声光调制器(AOM)，AOM工作频率为40MHz，隔离器设置为消除反向光。为了消除外界环境干扰，将延迟光纤放在隔音箱中。延迟光纤***损耗为3dB，AOM***损耗为4dB，整个环路包括连接器在内***损耗为9dB左右。为了提高光功率，在环路中使用了一个EDFA，光滤波器用来滤除EDFA的ASE噪声。
待测光纤为两卷10km的单模光纤(SMF)，通过光纤连接器连接。图7给出了第一个光纤连接器附近的背向散射信息。图7左上角的图形为菲涅尔反射峰的放大示意图，图中35cm的空间分辨率为补偿前的菲涅尔反射峰空间分辨率，10cm的空间分辨率为补偿后的菲涅尔反射峰空间分辨率。在补偿前由于相位噪声的影响，测得的光纤接头菲涅尔反射峰空间分辨率为35cm，通过采用本发明实施例提出的光源相位噪声补偿方法，在频域80MHz(AOM工作频率的两倍)附近得到了第一个光纤连接器产生的菲涅尔反射峰，参考光在OFDL中环绕了两圈后和信号光相干。空间分辨率为10cm，与理论空间分辨率相符合。同样，我们在160MHZ附近获得了待测光纤末端接头的菲涅尔反射峰，参考光在OFDL中环绕了四圈后和信号光相干。如图8所示，图8中380cm的空间分辨率为补偿前的菲涅尔反射峰的空间分辨率，11cm的空间分辨率为补偿后的菲涅尔反射峰的空间分辨率。从图8中可知，补偿后得 到的反射峰空间分辨率为11cm，与理论空间分辨率基本符合。相比于补偿前的380cm空间分辨率，本发明可选实施例提出的光源相位噪声补偿方法提高了空间分辨率40倍。
应用本发明可选实施例提出的光源相位噪声补偿方法，在ML/4(其中M为奇数，L为延迟光纤长度)处有最差的补偿效果。在最差补偿点处马赫-曾德尔干涉仪两臂光程差为，为了检测这些点的补偿效果，分别测量了相位噪声补偿前和补偿后，长度为5km、8.1km(由于实验室没有7.5km长度光纤，采用8.1km光纤代替)、10km、12.5km、15km、17.5km和20km的光纤，并记录其末端菲涅尔反射峰空间分辨率。测量结果如图9所示，在这些补偿效果最差的点也获得了和理论相符的空间分辨率。其中，图9中的所有测量结果均进行了10次并取平均值。
综上所述，采用本发明实施例提供的激光器相位噪声消除方案，能够补偿OFDR技术中的光源相位噪声，实现数十公里甚至上百公里测量范围内厘米量级空间分辨率的分布式测量。
一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现所述的激光器相位噪声消除方法。
显然，本领域的技术人员应该明白，上述的本发明实施例的每个模块或每个步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成多个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明实施例不限制于任何特定的硬件和软件结合。
以上所述仅为本发明可选实施例而已，并不用于限制本发明实施例，对于本领域的技术人员来说，本发明实施例可以有多种更改和变化。凡在本发明实施例的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明实施例的保护范围之内。
工业实用性
通过本发明实施例方案，采用包括马赫-曾德尔干涉仪和光纤延迟环的相位噪声消除装置，其中，光纤延迟环通过第一光耦合器耦合在马赫-曾德尔干涉仪的参考臂上，光纤延迟环包括串接的声光调制器和预定长度的延迟光纤，其中，预定长度小于或等于激光器的相干长度，解决了相关技术中光频域反射仪技术对长距离测量的空间分辨率低的问题，提高了光频域反射仪技术对长距离测量的空间分辨率。

Claims (10)

  1. 一种激光器相位噪声消除装置，包括马赫-曾德尔干涉仪，其特征在于，所述相位噪声消除装置还包括：光纤延迟环；
    所述光纤延迟环通过第一光耦合器耦合在所述马赫-曾德尔干涉仪的参考臂上，所述光纤延迟环包括串接的声光调制器和预定长度的延迟光纤，其中，所述预定长度小于或等于所述激光器的相干长度。
  2. 根据权利要求1所述的激光器相位噪声消除装置，所述光纤延迟环还包括：掺铒光纤放大器和光带通滤波器，其中，
    所述掺铒光纤放大器、所述光带通滤波器、所述声光调制器和所述延迟光纤沿所述参考臂上的参考光束传播方向依次串接；或者，
    所述掺铒光纤放大器、所述光带通滤波器、所述延迟光纤和所述声光调制器沿所述参考臂上的参考光束传播方向依次串接。
  3. 根据权利要求1所述的激光器相位噪声消除装置，其特征在于，所述光纤延迟环还包括：设置为隔离反向光束的隔离器，其中，
    所述声光调制器、所述延迟光纤和所述隔离器沿所述参考臂上的参考光束传播方向依次串接；或者，
    所述延迟光纤、所述声光调制器和所述隔离器沿所述参考臂上的参考光束传播方向依次串接。
  4. 根据权利要求1所述的激光器相位噪声消除装置，其中，所述马赫-曾德尔干涉仪包括：所述参考臂、探测臂和第二光耦合器；
    所述第二光耦合器与所述参考臂的输入端和所述探测臂的输入端连接，设置为将外部调制扫频光源装置生成的扫频信号分成参考光束和探测光束，并将所述参考光束送入所述参考臂，将所述探测光束送入所述探测臂；
    所述探测臂包括环形器，所述环形器包括第一端口、第二端口、第三端口和第四端口，其中，所述第一端口设置为接收所述探测光束并将所述探测光束从所述第二端口送出，所述第二端口设置为与待测光纤连接，所述第三端口设置为接收由所述待测光纤反射回来的背向散射光束，所述第四端口设置为将所述背向散射光束送入第三光耦合器；
    所述参考臂的输出端与所述第三光耦合器连接，设置为将所述参考臂的输出端上的参考光束送入所述第三光耦合器，令所述参考臂的输出端上的参考光束与所述背向散射光束相干涉。
  5. 根据权利要求1所述的激光器相位噪声消除装置，其中，所述延迟光纤放置在隔音介质中。
  6. 根据权利要求1所述的激光器相位噪声消除装置，其中，所述延迟光纤为长度为10千米的单模光纤。
  7. 一种激光器相位噪声消除***，包括如权利要求1至6中任一项所述的激光器相位噪声消除装置、外部调制扫频光源装置和光电探测和数据采集模块；
    所述外部调制扫频光源装置、所述激光器相位噪声消除装置和所述光电探测和数据采集模块依次连接；
    所述外部调制扫频光源装置设置为生成扫频光束；
    所述光电探测和数据采集模块设置为对所述激光器相位噪声消除装置输出的干涉光束进行处理。
  8. 根据权利要求7所述的激光器相位噪声消除***，其中，所述光电探测和数据采集模块包括：平衡光电探测器和与所述平衡光电探测器连接的数据采集卡；
    所述平衡光电探测器设置为对所述干涉光束进行光电转换；
    所述数据采集卡设置为将光电转换得到的模拟信号转换为数字信号。
  9. 一种激光器相位噪声消除方法，包括：
    将从马赫-曾德尔干涉仪的参考臂上第一光耦合器耦合出的参考光束循环送入光纤延迟环，令所述参考光束在所述光纤延迟环中的每次传输都经过预定长度的延迟光纤并进行预定频率的频移；
    将所述参考臂的输出端上的参考光束送入所述第三光耦合器，令所述参考臂的输出端上的参考光束与所述马赫-曾德尔干涉仪的探测臂输出的背向散射光束相干涉，得到干涉光束；
    通过光电探测和数据采集模块对所述干涉光束进行处理。
  10. 一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现权利要求9所述的激光器相位噪声消除方法。
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CN115604613B (zh) * 2022-12-01 2023-03-17 杭州兆华电子股份有限公司 一种基于隔音箱实现的声干扰消除方法
CN115622626A (zh) * 2022-12-20 2023-01-17 山东省科学院激光研究所 一种分布式声波传感语音信息识别***及方法
CN115622626B (zh) * 2022-12-20 2023-03-21 山东省科学院激光研究所 一种分布式声波传感语音信息识别***及方法

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