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12 December 2018 Enhanced SNR phase-sensitive OTDR system with active fiber
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Proceedings Volume 10849, Fiber Optic Sensing and Optical Communication; 108490C (2018)
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
A simplified approximate theoretical model between phase noise and Rayleigh backscattering (RS) light is introduced to analyze the performance of distributed acoustic sensing, and results show that noise is relative to the static RS amplitude. Er3+-doped active fiber is used to increase RS light and compress system noise. The system phase noise reduces more than 14 dB, a noise level of 9×10-4 rad/√Hz and signal-to-noise ratio of 46.6 dB @ 100 Hz are obtained experimentally.
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Shengwen Feng, Tuanwei Xu, Jianfen Huang, Yang Yang, Fang Li, Jinming Zhou, and Hesper Yu "Enhanced SNR phase-sensitive OTDR system with active fiber", Proc. SPIE 10849, Fiber Optic Sensing and Optical Communication, 108490C (12 December 2018);

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