Phase-optical time domain reflectometry ([theta]-OTDR) with enhanced performance

Nageswara Lalam; Ping Lu; Michael Buric; Paul R. Ohodnicki

doi:10.1117/12.2545089

2 March 2020 Phase-optical time domain reflectometry (Θ-OTDR) with enhanced performance

Nageswara Lalam, Ping Lu, Michael Buric, Paul R. Ohodnicki

Proceedings Volume 11287, Photonic Instrumentation Engineering VII; 112870R (2020) https://doi.org/10.1117/12.2545089
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

In this paper, the phase-sensitive optical time-domain reflectometry (Φ-OTDR) system is experimentally demonstrated using a Rayleigh enhanced AcoustiSens optical fiber to improve the acoustic sensing performance. The AcoustiSens optical fiber made of continuous gratings over the fiber, which significantly enhances the backscattered signal by 15 dB compared to the standard single-mode silica fiber. In addition, a simple and cost-effective self-mixing demodulation technique has been employed in coherent Φ-OTDR system to eliminate the frequency offset between the electrical local oscillator and the beat signal. The acoustic sensing performance with various acoustic frequencies are experimentally demonstrated in the proposed system using a 2 km sensing fiber with 1 m spatial resolution.

Conference Presentation

Citation Download Citation

Nageswara Lalam, Ping Lu, Michael Buric, and Paul R. Ohodnicki "Phase-optical time domain reflectometry (Θ-OTDR) with enhanced performance", Proc. SPIE 11287, Photonic Instrumentation Engineering VII, 112870R (2 March 2020); https://doi.org/10.1117/12.2545089

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