An improved NPS algorithm for suppressing polarization fading in interferometric optical fiber sensing

Zhenyu Deng; Qin Wei; Haokun Mi; Honghai Wang

doi:10.1117/12.2661057

16 December 2022 An improved NPS algorithm for suppressing polarization fading in interferometric optical fiber sensing

Zhenyu Deng, Qin Wei, Haokun Mi, Honghai Wang

Proceedings Volume 12500, Fifth International Conference on Mechatronics and Computer Technology Engineering (MCTE 2022); 125006E (2022) https://doi.org/10.1117/12.2661057
Event: 5th International Conference on Mechatronics and Computer Technology Engineering (MCTE 2022), 2022, Chongqing, China

Abstract

There is polarization fading in interferometric distributed acoustic sensing (DAS) system, which leads to the situation that sensors cannot perceive the external signal. In order to improve the reliability and robustness of DAS system, an improved NPS algorithm for suppressing polarization fading based on malposition matched interference is proposed. According to the principle that the quadratic sum of the visibilities of two interference lights is one when two beams of light with orthogonal polarization interfere with another beam, the polarization related parameters can be eliminated by combining the two signals for phase demodulation, so as to suppress polarization fading. In this paper, the two signals are obtained by using the pulse group of specific states of polarization (SOP) for malposition matching interference, and then the joint NPS demodulation algorithm is used for demodulation, which ensures that the signal-to-noise ratio (SNR) of the signal is stable at about 37dB.

Citation Download Citation

Zhenyu Deng, Qin Wei, Haokun Mi, and Honghai Wang "An improved NPS algorithm for suppressing polarization fading in interferometric optical fiber sensing", Proc. SPIE 12500, Fifth International Conference on Mechatronics and Computer Technology Engineering (MCTE 2022), 125006E (16 December 2022); https://doi.org/10.1117/12.2661057

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