光通信技术2026，Vol.50Issue(2)：1-6,6.DOI:10.13921/j.cnki.issn1002-5561.2026.02.001
移频双脉冲相干探测相位敏感光时域反射仪
Frequency-shifted dual-pulse coherent detection Φ-OTDR
摘要
Abstract
To enhance the phase demodulation performance of phase-sensitive optical time-domain reflectometer(Φ-OTDR),a frequency-shifted dual-pulse coherent detection Φ-OTDR system is proposed.By analyzing the amplitude-frequency response of the acousto-optic modulator and the beat signal spectrum,the frequency-shift parameters of the dual pulses were optimized,and orthogonal demodulation was performed on the Rayleigh scattering signals.The experimental results show that the system can accurately demodulate vibration signals in the range of 50～2 000 Hz,with a linear fitting degree of 0.992 2 between the am-plitude of the driving signal and the phase amplitude.The probability of interference fading is reduced from 25.93%to 8.28%,achieving low-fading phase demodulation.关键词
分布式光纤传感/相位敏感光时域反射/移频双脉冲/相干探测/相位解调Key words
distributed optical fiber sensing/phase-sensitive optical time-domain reflectometer/frequency-shifted dual pulse/coherent detection/phase demodulation分类
信息技术与安全科学引用本文复制引用
樊迎瑞,王宇,梅若彤,王俊虹,王鹏飞,刘昕,靳宝全..移频双脉冲相干探测相位敏感光时域反射仪[J].光通信技术,2026,50(2):1-6,6.基金项目
国家自然科学基金项目(62375197)资助 （62375197）
中央引导地方科技发展资金项目(YDZJSX2024C002)资助 （YDZJSX2024C002）
中央引导地方科技发展资金项目(YDZJSX20231B004)资助 （YDZJSX20231B004）
山西省科技创新团队项目(201805D131003)资助. （201805D131003）
