Acoustic antenna based on fiber laser hydrophones

F.-X. Launay; R. Bouffaron; R. Lardat; G. Roux; M. Doisy; C. Bergogne

doi:10.1117/12.2059066

2 June 2014 Acoustic antenna based on fiber laser hydrophones

F.-X. Launay, R. Bouffaron, R. Lardat, G. Roux, M. Doisy, C. Bergogne

Author Affiliations +

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91570Y (2014) https://doi.org/10.1117/12.2059066
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A technique to enhance the response of Brillouin distributed sensors is proposed and experimentally validated. The method consists in creating a multi-frequency pump pulse interacting with a multi-frequency continuous-wave probe. The power of each pulse at a distinct frequency is lower than the threshold for nonlinear effects, while the sensor response remains given by the total power of all pulses. Distinct frequency pulses are delayed to avoid temporal overlapping and cross-interaction; this requires to smartly reconstruct the traces before photo-detection. The method is validated in a 50 km-long sensor using 3 frequencies, demonstrating a signal-to-noise ratio enhancement of 4.8 dB.

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F.-X. Launay, F.-X. Launay, R. Bouffaron, R. Bouffaron, R. Lardat, R. Lardat, G. Roux, G. Roux, M. Doisy, M. Doisy, C. Bergogne, C. Bergogne, "Acoustic antenna based on fiber laser hydrophones", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91570Y (2 June 2014); doi: 10.1117/12.2059066; https://doi.org/10.1117/12.2059066

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