Optical Phase-Sensitive Reflectometry Based on Orthogonal Frequency-Division Multiplexed LFM Signal in Fractional Fourier Domain,Laser & Photonics Reviews

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Optical Phase-Sensitive Reflectometry Based on Orthogonal Frequency-Division Multiplexed LFM Signal in Fractional Fourier Domain
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2023-02-07 , DOI: 10.1002/lpor.202200838
Can Zhao ₁ , Li Wang ₁ , Hao Wu ₁ , Ming Tang ₁

Affiliation

Linear frequency modulated (LFM) phase-sensitive optical time-domain reflectometry (φ-OTDR) relieves the trade-off between sensing range and spatial resolution; however, it is still limited by low sidelobe suppression ratio and signal fading. Fractional Fourier transform (FrFT) is applied to LFM φ-OTDR for signal generation and compression. An LFM pulse is generated using the p-order FrFT of a direct current signal and then compressed using FrFT with order 1−p to achieve a high sidelobe suppression ratio. Orthogonal frequency-division multiplexing in the fractional Fourier domain is utilized to suppress signal fading. In experiments, fading-free distributed phase measurement is realized using a multiplexed LFM probe pulse generated using a 0.4-order FrFT. Dynamic sensing is demonstrated via single-frequency or sweep-frequency vibration, thereby validating high sensing performance. This work will not only open up a route for signal processing in LFM pulse based high-performance φ-OTDR, but also has significant potential for applications in other sensing systems using LFM signals.

中文翻译：

基于分数阶傅立叶域正交频分复用 LFM 信号的光相敏反射计

线性调频 (LFM) 相敏光时域反射计 (φ-OTDR) 减轻了传感范围和空间分辨率之间的权衡；然而，它仍然受到低旁瓣抑制比和信号衰落的限制。分数阶傅里叶变换 (FrFT) 应用于 LFM φ-OTDR，用于信号生成和压缩。使用直流信号的p阶 FrFT生成 LFM 脉冲，然后使用阶数为 1− p的 FrFT 进行压缩实现高旁瓣抑制比。利用分数阶傅立叶域中的正交频分复用来抑制信号衰落。在实验中，使用 0.4 阶 FrFT 生成的多路复用 LFM 探测脉冲实现了无衰减分布式相位测量。通过单频或扫频振动演示动态传感，从而验证高传感性能。这项工作不仅为基于 LFM 脉冲的高性能 φ-OTDR 中的信号处理开辟了一条途径，而且在使用 LFM 信号的其他传感系统中具有巨大的应用潜力。

更新日期：2023-02-07

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