中国光学（中英文）2025，Vol.18Issue(2)：287-296,10.DOI:10.37188/CO.2024-0122
相敏型光时域反射系统信噪比提升
Improvement of signal-to-noise ratio for phase-sensitive optical time-domain reflecting system
摘要
Abstract
The sensitivity of the phase-sensitive optical time-domain reflecting(Φ-OTDR)system is limited by the system's intrinsic noise,such as the laser's phase noise,the erbium-doped fiber amplifier's spontan-eous emission noise,and the photodetector's shot and thermal noise,as well as random environment of noise.Therefore,we investigate the noise reduction algorithm based on the optical time-domain reflecting data to improve the system's signal-to-noise ratio(SNR)without degrading its frequency response range.Further-more,we propose a Savitzky-Golay smoothing algorithm by selecting a slidable fixed-length window to pro-cess OTDR data for the SNR improvement while maintaining the system sampling frequency.Then,we built the experimental system to demonstrate the results.The experimental results show that by using the Savitzky-Golay smoothing algorithm,the SNR of the system is improved by 5.41 dB relative to the difference method with the original data,and the SNR is improved by 3.39 dB and 5.05 dB,compared to the commonly used cu-mulative averaging method and sliding averaging method,respectively.It is demonstrated that the Savitzky-Golay smoothing algorithm can improve the sensitivity and accuracy of the Φ-OTDR system,which helps to sense weak vibration events accurately and reduce false alarm rates.关键词
相位敏感光时域反射仪/Savitzky-Golay平滑算法/信噪比/阈值定位Key words
phase sensitive optical time domain reflectometer/Savitzky-Golay smoothing algorithm/SNR/threshold positioning分类
计算机与自动化引用本文复制引用
王子豪,刘志凯,冯玉祥,张成龙,吕立冬..相敏型光时域反射系统信噪比提升[J].中国光学（中英文）,2025,18(2):287-296,10.基金项目
国家自然科学基金项目(No.51977001) Supported by National Natural Science Foundation of China(No.51977001) （No.51977001）
