Coherent fading suppression method in the COTDR system based on multi-band filtering

IF 2.5 3区物理与天体物理 Q2 OPTICS Optics Communications Pub Date : 2025-06-01 Epub Date: 2025-03-04 DOI:10.1016/j.optcom.2025.131696

Xiang Sui , Ying Shang , Sheng Huang , Wenan Zhao , Xiaohan Qiao , Guangqiang Liu , Chunmei Yao , Shouling Liu , Na Wan , Xianggui Kong , Hong Zhao , Fengming Mou , Zhengying Li , Weitao Wang , Chen Wang , Gangding Peng

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Abstract

In this paper, a multi-band filtering method is proposed and demonstrated to suppress the coherent fading in the coherent optical time-domain reflectometry (COTDR) system. The local light and the Rayleigh backscattered (RBS) light beat together and create the intermediate frequency signal u_BPD(t). Effective bandwidth BW_c can be obtained by analysing the frequency composition of u_BPD(t). Applying band-pass filters with different widths no less than BW_c, signals with varying amplitude distributions can be obtained. The coherent fading can be eliminated by fusing signals with amplitude evaluation method. The experimental results show that the standard deviation of the demodulated phase is reduced from 0.039 rad to 0.008 rad. Additionally, the signal-to-noise ratio (SNR) of the demodulated signal is 40 dB. The results demonstrated the high reliability of this method.

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基于多波段滤波的COTDR系统相干衰落抑制方法

提出了一种抑制相干光时域反射（COTDR）系统中相干衰落的多波段滤波方法。本地光和瑞利背散射（RBS）光一起拍击，产生中频信号uBPD(t)。通过分析uBPD(t)的频率组成，可以得到有效带宽BWc。应用不小于BWc的不同宽度的带通滤波器，可以得到不同幅度分布的信号。采用幅度评估法对信号进行融合，可以消除相干衰落。实验结果表明，解调相位的标准差从0.039 rad降低到0.008 rad，解调信号的信噪比为40 dB。结果表明，该方法具有较高的可靠性。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.