Optical fiber distributed acoustic sensing based on NUFDM-NLFM

Yuan Zhang; Xueguang Yuan; Zhengyang Li; Zhenyu Xiao; Yang'an Zhang

doi:10.1117/12.2691193

1 August 2023 Optical fiber distributed acoustic sensing based on NUFDM-NLFM

Yuan Zhang, Xueguang Yuan, Zhengyang Li, Zhenyu Xiao, Yang'an Zhang

Proceedings Volume 12752, Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023); 1275203 (2023) https://doi.org/10.1117/12.2691193
Event: Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023), 2023, Hangzhou, China

Abstract

In the field of optical fiber distributed acoustic sensing, the combination of pulse compression and frequency division multiplexing will occupy a large bandwidth. In this paper, a novel distributed optical fiber acoustic sensor system is proposed, which can reduce the spectrum resources occupied by the combination of the above two technologies. The system continuously injects nonlinear frequency modulation detection pulses of different frequency ranges. The frequency response range of vibration is improved by frequency division multiplexing, and the spatial resolution is enhanced by nonlinear frequency modulation. Nonlinear frequency modulation also improves the sidelobe rejection ratio without loss of signal-to-noise ratio. In the experiment, eight frequencies were multiplexed using a 120MHz bandwidth. We achieved a spatial resolution of about 5m and a frequency response range of 1~20kHz on a 16.3km fiber.

Citation Download Citation

Yuan Zhang, Xueguang Yuan, Zhengyang Li, Zhenyu Xiao, and Yang'an Zhang "Optical fiber distributed acoustic sensing based on NUFDM-NLFM", Proc. SPIE 12752, Second International Conference on Optoelectronic Information and Computer Engineering (OICE 2023), 1275203 (1 August 2023); https://doi.org/10.1117/12.2691193

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