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A Brillouin Optical Time Domain Analysis Method Based on Brillouin Phase Shift Demodulation

An optical time-domain analysis and phase-shifting technology, which is applied in the direction of transmitting sensing components with optical devices, can solve the problems of reduced sampling rate and poor demodulation effect, and achieves a simple method, phase noise elimination, and easy adjustment Effect

Active Publication Date: 2021-08-03
SOUTHWEST JIAOTONG UNIV +1
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Problems solved by technology

Techniques 3 and 4 reduce the sampling rate, but both require a dual-channel acquisition device, and the two channels need to be well synchronized
Moreover, none of the above techniques takes into account the influence of phase noise, so although the above techniques can demodulate the Brillouin phase, the demodulation effect is not very good

Method used

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  • A Brillouin Optical Time Domain Analysis Method Based on Brillouin Phase Shift Demodulation
  • A Brillouin Optical Time Domain Analysis Method Based on Brillouin Phase Shift Demodulation
  • A Brillouin Optical Time Domain Analysis Method Based on Brillouin Phase Shift Demodulation

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] The present invention is based on the Brillouin optical time-domain analysis method of Brillouin phase shift demodulation, the optical path adopts a symmetrical bilateral-band Brillouin optical time-domain analysis system, and the detection light is generated by cascade modulation of a Mach-Zehnder modulator and a phase modulator , where the light generated by the first stage modulation is used as the light interacting with the pump, the light generated by the second stage is used as auxiliary light to eliminate phase noise, and the receiving end is coherently detected; the circuit uses envelope detection to demodulate the signal.

[0027] Such as figure 1 As shown, the continuous light output by the tunable laser 1 is divided into two branches of continuous light by the optical coupler 2; the continuous light of the upper bran...

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Abstract

The invention discloses a Brillouin optical time domain analysis system based on Brillouin phase shift demodulation, which is composed of two parts: optical path detection and circuit demodulation; The light is generated by cascade modulation of Mach-Zehnder modulator and phase modulator, the light generated by the first stage modulation is used as the light interacting with the pump, the light generated by the second stage is used as auxiliary light to eliminate phase noise, and the receiving end is coherently detected; The circuit uses envelope detection to demodulate the signal. The system of the invention is simple, easy to implement and easy to adjust; single channel, low sampling rate, less data volume; high Brillouin phase measurement accuracy and high stability can be obtained.

Description

technical field [0001] The invention relates to the technical field of distributed optical fiber sensing, in particular to a Brillouin optical time domain analysis method based on Brillouin phase shift demodulation. Background technique [0002] In recent years, with the rapid development of oil and gas pipelines, high-speed rail, and large buildings, distributed optical fiber sensing technology has attracted more and more attention from all walks of life. Due to its many advantages, distributed optical fiber sensing technology has become a The key technology for external information perception in long-distance and harsh environments. The Brillouin optical time domain analysis technology is a very important technology among many distributed optical fiber sensing technologies. It is mainly used in oil and gas pipelines, structural health monitoring and other fields. The traditional Brillouin optical time domain analysis technique obtains the Brillouin frequency shift by mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 闫连山何海军李宗雷张信普潘炜
Owner SOUTHWEST JIAOTONG UNIV
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