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Proceedings Paper

Effect of laser linewidth on phase-OTDR based distributed vibration sensing regime
Author(s): Leilei Shi; Tao Zhu; Qian He; Shihong Huang
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Paper Abstract

The effect of fiber laser linewidth on the optical time-domain reflectometer based vibration distributed sensing regime is studied experimentally in this paper. Lasers with multi-longitudinal modes, 5 kHz and ~800 Hz linewidth single longitudinal mode are interrogated as light source successively. Experiments show that narrower linewidth laser results in higher repeatable and stable scattering spectrum. When the 800 Hz linewidth laser is modulated into 50 ns width pulses, the signal to noise ratio is ~ 6 dB and the spatial resolution is improved to 3 m, breaking the traditional theory limit.

Paper Details

Date Published: 2 June 2014
PDF: 4 pages
Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91576H (2 June 2014); doi: 10.1117/12.2059448
Show Author Affiliations
Leilei Shi, Chongqing Univ. (China)
Tao Zhu, Chongqing Univ. (China)
Qian He, Chongqing Univ. (China)
Shihong Huang, Chongqing Univ. (China)

Published in SPIE Proceedings Vol. 9157:
23rd International Conference on Optical Fibre Sensors
José M. López-Higuera; Julian D. C. Jones; Manuel López-Amo; José Luis Santos, Editor(s)

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