Three-Layer Structure Multiplexing Fading Elimination Method in Long-Haul Φ-OTDR

Phase fading is a critical issue that hinders phase retrieval in the phase-sensitive optical time-domain reflectometry (ϕ-OTDR). This paper introduces a novel approach for mitigating fading effects by implementing a three-layer structure multiplexing (TLSM) technique. The TLSM method is based on mul...

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Published in:Journal of lightwave technology 2024-07, Vol.42 (14), p.5017-5024
Main Authors: Wu, Yichang, Wei, Zhanhang, Li, Tianrui, Chen, Shaoyi, Liu, Zhengyong, Sui, Qi, Li, Zhaohui
Format: Article
Language:English
Subjects:
Fading
Fading channels
Interrogation
Kalman filter
Kalman filters
Multiplexing
Noise
Optical fiber sensors
Optical pulses
Phase retrieval
Scattering
TLSM technique
Vibrations
Φ-OTDR
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container_issue 14
container_start_page 5017
container_title Journal of lightwave technology
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creator Wu, Yichang
Wei, Zhanhang
Li, Tianrui
Chen, Shaoyi
Liu, Zhengyong
Sui, Qi
Li, Zhaohui
description Phase fading is a critical issue that hinders phase retrieval in the phase-sensitive optical time-domain reflectometry (ϕ-OTDR). This paper introduces a novel approach for mitigating fading effects by implementing a three-layer structure multiplexing (TLSM) technique. The TLSM method is based on multiple pulses detection, trace decomposition and spatial multiplexing to create independent sub-components, which are then re-combined by rotated vector summation (RVS) method. Additionally, a Kalman filter is employed to eliminate the phase mismatching among these sub-components. Experimental results demonstrate a fading-free interrogation in a 40-km fiber sensing range and distorted vibration signal can be corrected. The demodulated amplitude trough could be improved by 35.2 dB. Large-sample testing confirms no occurrence of fading throughout the entire 40 km sensing range, indicating the high reliability of this method.
doi_str_mv 10.1109/JLT.2024.3383413
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subjects Fading
Fading channels
Interrogation
Kalman filter
Kalman filters
Multiplexing
Noise
Optical fiber sensors
Optical pulses
Phase retrieval
Scattering
TLSM technique
Vibrations
Φ-OTDR
title Three-Layer Structure Multiplexing Fading Elimination Method in Long-Haul Φ-OTDR
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