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

IF 2.2 3区物理与天体物理 Q2 OPTICS Optics Communications Pub 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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引用次数: 0

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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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.