Phase distortion suppression for phase-sensitive OTDR using time-slotted pulse

IF 2.6 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Optical Fiber Technology Pub Date : 2025-06-19 DOI:10.1016/j.yofte.2025.104316

Yu Wang , Yingrui Fan , Junhong Wang , Weidong Bai , Ruotong Mei , Xin Liu , Baoquan Jin

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引用次数: 0

Abstract

Phase distortion influences the vibration demodulation effect of direct detection phase-sensitive optical time-domain reflectometer (Φ-OTDR) system. In this paper, a time-slotted pulsed direct detection Φ-OTDR is proposed. By using a double acousto-optic modulation device to generate the same-frequency phase-shifted time-slotted pulse, the phase distortion caused by the excessively long disturbance range can be effectively suppressed. The sliding window empirical modal decomposition (SWEMD) is introduced to solve the anisotropy problem of phase distortion and extract the correct signal. The phase demodulation performance of the single-pulse and time-slotted pulsed detection structures are compared and analyzed. The experimental results show that the vibration and sound signals from 50 Hz to 1300 Hz can be accurately demodulated along a 10040 m sensing fiber, and the amplitude fitting coefficients of demodulated vibration and sound signals in the repeatability experiments can be up to 0.9912 and 0.9906, respectively. The sampling rate of the system is as low as 50 MHz. It provides an effective solution for the direct detection Φ-OTDR with high-quality phase demodulation for weak signals.

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利用时隙脉冲抑制相敏OTDR的相位畸变

相位畸变影响直接检测相敏光学时域反射计（Φ-OTDR）系统的振动解调效果。本文提出了一种时隙脉冲直接检测Φ-OTDR。采用双声光调制装置产生同频移相时隙脉冲，可有效抑制干扰范围过长引起的相位畸变。引入滑动窗口经验模态分解（SWEMD），解决了相位畸变的各向异性问题，提取出正确的信号。比较分析了单脉冲和时隙脉冲检测结构的相位解调性能。实验结果表明，50 Hz ~ 1300 Hz的振动和声音信号可以沿10040 m传感光纤进行精确解调，解调后的振动和声音信号在重复性实验中的振幅拟合系数分别可达0.9912和0.9906。系统的采样率低至50mhz。它为微弱信号的高质量相位解调提供了直接检测Φ-OTDR的有效解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.