Impact of the laser phase noise on chirped-pulse phase-sensitive OTDR

Juan Pastor-Graells; María R. Fernández-Ruiz; Hugo F. Martins; Andres Garcia-Ruiz; Sonia Martin-Lopez; Miguel Gonzalez-Herraez

doi:10.1117/12.2266870

23 April 2017 Impact of the laser phase noise on chirped-pulse phase-sensitive OTDR

Juan Pastor-Graells, María R. Fernández-Ruiz, Hugo F. Martins, Andres Garcia-Ruiz, Sonia Martin-Lopez, Miguel Gonzalez-Herraez

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238T (2017) https://doi.org/10.1117/12.2266870
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

In this work, the impact of the laser phase noise on chirped-pulse phase-sensitive OTDR signals is theoretically and experimentally analyzed. In particular, it is shown that the noise in the readings of strain/temperature changes along the fiber scales directly with the frequency noise power spectral density of the laser. The effect of the pulse chirp on the signal to noise ratio is also investigated. Three lasers with different linewidths (5 MHz, 50 kHz and 25 kHz), i.e., with different phase noise, were used for the experimental study, confirming the validity of the theoretical model.

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Juan Pastor-Graells, María R. Fernández-Ruiz, Hugo F. Martins, Andres Garcia-Ruiz, Sonia Martin-Lopez, and Miguel Gonzalez-Herraez "Impact of the laser phase noise on chirped-pulse phase-sensitive OTDR", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238T (23 April 2017); https://doi.org/10.1117/12.2266870

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