A high fidelity Ф-OTDR system based on compact and flexible multi-frequency probe pulse modulation

Yanyang Lei; Fang Chen; Guangzhe Wu; Ying Wang; Ruyi Zhang; Li Li; Jun Wu; Hongyan Zhou; Zhirui Zhou; Chen Hu; Xi Li; Chao Xu; Meng Li; Ji Qi

doi:10.1117/12.3007026

18 December 2023 A high fidelity Φ-OTDR system based on compact and flexible multi-frequency probe pulse modulation

Yanyang Lei, Fang Chen, Guangzhe Wu, Ying Wang, Ruyi Zhang, Li Li, Jun Wu, Hongyan Zhou, Zhirui Zhou, Chen Hu, Xi Li, Chao Xu, Meng Li, Ji Qi

Author Affiliations +

Proceedings Volume 12968, AOPC 2023: Optic Fiber Gyro ; 1296816 (2023) https://doi.org/10.1117/12.3007026
Event: Applied Optics and Photonics China 2023 (AOPC2023), 2023, Beijing, China

Abstract

In this paper, we propose a high fidelity phase-sensitive optical time-domain reflectometer (Φ-OTDR) system based on compact and flexible multi-frequency probe pulse modulation. Single-frequency continuous light is multi-frequencymodulated by a broadband acousto-optic modulator (AOM) loaded with multiple microwave signals of different frequencies, finally, multiple Rayleigh backscattered (RBS) optical signals with different intensity distributions can be obtained by a single acquisition, and the most accurate signal is always selected for phase reconstruction to achievethehigh fidelity Φ-OTDR system, which has the advantages of compact structure, precise control of phase delay, flexible and controllable frequency components, and no sacrificing response bandwidth and spatial resolution, etc. In the experiment Φ-OTDR system, we simultaneously modulate the multi-frequency probe pulse light with a width of 100nsand three non-equidistant frequencies, and inject it into a 2km sensing fiber. The RBS light signal multiplexing results show that the probability of interference fading effect in the system is reduced from 17.541% to 1.123%. And the high-fidelity phase information of a 100Hz simulated vibration signal was extracted on a 3km sensing fiber, corresponding to a strain value of about 11.9nε.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Yanyang Lei, Fang Chen, Guangzhe Wu, Ying Wang, Ruyi Zhang, Li Li, Jun Wu, Hongyan Zhou, Zhirui Zhou, Chen Hu, Xi Li, Chao Xu, Meng Li, and Ji Qi "A high fidelity Φ-OTDR system based on compact and flexible multi-frequency probe pulse modulation", Proc. SPIE 12968, AOPC 2023: Optic Fiber Gyro , 1296816 (18 December 2023); https://doi.org/10.1117/12.3007026

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KEYWORDS

Modulation

Modulation frequency

Pulse signals

Signal intensity

Vibration

Bragg cells

Frequency modulation

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