Boosting the spatial resolution in chirped pulse ϕ-OTDR using sub-band processing

Leonardo Marcon; Marcelo A. Soto; Miguel Soriano-Amat; Luis Costa; Hugo F. Martins; Luca Palmieri; Miguel Gonzalez-Herraez

doi:10.1117/12.2539794

28 August 2019 Boosting the spatial resolution in chirped pulse Φ-OTDR using sub-band processing

Leonardo Marcon, Marcelo A. Soto, Miguel Soriano-Amat, Luis Costa, Hugo F. Martins, Luca Palmieri, Miguel Gonzalez-Herraez

Author Affiliations +

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111991W (2019) https://doi.org/10.1117/12.2539794
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

Chirped pulse phase-sensitive optical time-domain reflectometry (chirped pulse Φ-OTDR) allows the interrogation of tens of kilometers of optical fiber with high sensitivity and linearity, but typically with spatial resolution limited to ten meters to ensure proper processing and signal-to-noise ratio (SNR). In this paper, we propose a method to increase the spatial resolution of a chirped pulse Φ-OTDR without reducing the pulse width. The improvement is achieved by adding an optical carrier to the input chirped pulse and by applying digital filtering to the measured backscatter traces. Experimental results validate the method, demonstrating a 10-fold resolution improvement with minimum impact on the measurement SNR.

Citation Download Citation

Leonardo Marcon, Marcelo A. Soto, Miguel Soriano-Amat, Luis Costa, Hugo F. Martins, Luca Palmieri, and Miguel Gonzalez-Herraez "Boosting the spatial resolution in chirped pulse Φ-OTDR using sub-band processing", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991W (28 August 2019); https://doi.org/10.1117/12.2539794

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