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Proceedings Paper

Frequency response enhancement for long-range φ-OTDR system by additive random sampling and nonlinear frequency modulation
Author(s): Haoting Wu; Jingdong Zhang; Xuefei Sun; Ming Deng; Guolu Yin; Tao Zhu
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Paper Abstract

We reported a new method based on additive random sampling (ARS) and non-linear frequency modulation (NLFM) to enhance the frequency response of long-range phase-sensitive optical time-domain reflectometry (φ-OTDR) system. Using the NLFM interrogation pulse, the side-lobe suppression ratio (SLSR) and signal-to-noise ratio (SNR) of the demodulated traces are improved, and phase signal detection with less than 3m spatial resolution is achieved over 50 km sensing range. By modulating the NLFM laser pulse intervals, we realize the ARS and the uniform sampling alternately for every sensing point of the long interrogation fiber, and therefore the frequency domain aliasing is avoided. We test the proposed system by detected a 20 kHz harmonic signal, and this signal is well identified and reconstructed over 50 km sensing range.

Paper Details

Date Published: 14 February 2019
PDF: 6 pages
Proc. SPIE 11048, 17th International Conference on Optical Communications and Networks (ICOCN2018), 110484Q (14 February 2019); doi: 10.1117/12.2522938
Show Author Affiliations
Haoting Wu, Chongqing Univ. (China)
Jingdong Zhang, Chongqing Univ. (China)
Xuefei Sun, Chongqing Univ. (China)
Ming Deng, Chongqing Univ. (China)
Guolu Yin, Chongqing Univ. (China)
Tao Zhu, Chongqing Univ. (China)

Published in SPIE Proceedings Vol. 11048:
17th International Conference on Optical Communications and Networks (ICOCN2018)
Zhaohui Li, Editor(s)

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