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An optical phase demodulation method and system based on polarization polarization reception

A technology of optical phase and demodulation methods, applied in instruments, measuring devices, utilizing wave/particle radiation, etc., can solve problems such as low system stability and phase noise

Active Publication Date: 2020-07-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide an optical phase demodulation method and system based on polarization polarization reception, aiming at solving the phase noise caused by polarization fading in the existing optical fiber distributed sensing system, which leads to The problem of low system stability

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  • An optical phase demodulation method and system based on polarization polarization reception
  • An optical phase demodulation method and system based on polarization polarization reception
  • An optical phase demodulation method and system based on polarization polarization reception

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[0055] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0056] refer to figure 1 , an embodiment of the present invention provides an optical phase demodulation method based on polarization polarization reception, comprising the following steps:

[0057] (1) collecting the first optical signal of the first sensing point A and the second optical signal of the second sensing point B;

[0058] Specifically, the optical signal includes signal light and reference light;

[0059] (2) performing I / Q demodulation on the first optical signal and the second optical signal respectively, and obtaining the X polarization corresponding to the first optical signal a...

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Abstract

Disclosed in the present invention are an optical phase demodulation method and system based on polarization-division receiving. The method comprises: performing I / Q demodulation on optical signals collected by two sensing points, and performing signal polarization-division receiving by using a polarization-division receiving device, and obtaining a corresponding signal component; constructing an optical phase vector according to the corresponding signal component; determining a birefringence phase vector according to the optical phase vector, and normalizing a phase difference; and after the birefringence phase vector is compensated, obtaining a phase change between the two sensing points by means of vector synthesis. According to the present invention, the birefringence phase vector is compensated, so that the influence of polarization fading on signal demodulation is reduced, and the system stability is improved; and an I signal and a Q signal are subjected to orthogonal decomposition, and optical signals are converted into vectors to implement depolarized phase demodulation, so that the birefringence phase difference can be accurately estimated, and the accuracy of signal restoration is improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber distributed acoustic wave sensing, and more specifically relates to an optical phase demodulation method and system based on polarization polarization reception. Background technique [0002] Fiber-optic distributed acoustic wave sensing systems have received great attention in applications such as infrastructure health monitoring, oil reservoir exploration, and underwater sound detection due to their low cost per sensing point and easy deployment. Using the backscattering effect, the optical fiber distributed acoustic wave sensing system detects the intensity, phase and frequency of backscattered light to obtain acoustic information along the fiber. Among various sensing mechanisms, optical phase sensing has become the mainstream of fiber-optic distributed acoustic wave sensing systems with the highest sensitivity. Since distributed optical fiber sensing can realize the extraction of distr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 孙琪真刘雨佳艾凡李豪刘涛闫志君刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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