17 October 2012 Interference-fading-free phase-demodulated OTDR system
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Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 842129 (2012); doi: 10.1117/12.975656
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China
Abstract
A phase-shifted double pulse method is proposed to reduce the influence of inner-pulse interference induced fading on phase demodulation of the Φ-OTDR. The feasibility of the technique is experimentally verified and the measurement resolution of the Φ-OTDR is minimized to as low as 0.1rad by using this technique. The experimental system demonstrates a distributed phase monitoring capability over 4km range with SNR of >20 and detection bandwidth of >360Hz.
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Zhengqing Pan, Kezhen Liang, Jun Zhou, Qing Ye, Haiwen Cai, Ronghui Qu, "Interference-fading-free phase-demodulated OTDR system", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 842129 (17 October 2012); doi: 10.1117/12.975656; https://doi.org/10.1117/12.975656
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KEYWORDS
Amplifiers

Signal to noise ratio

Ferroelectric materials

Signal detection

Modulation

Demodulation

Rayleigh scattering

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