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Proceedings Paper

Enhanced response in Brillouin distributed optical fibre sensors by simultaneous time and frequency pump multiplexing
Author(s): Marcelo A. Soto; Amelia Lavinia Ricchiuti; Liang Zhang; David Barrera; Salvador Sales; Luc Thévenaz
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Paper 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.

Paper Details

Date Published: 2 June 2014
PDF: 4 pages
Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91575T (2 June 2014); doi: 10.1117/12.2059006
Show Author Affiliations
Marcelo A. Soto, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Amelia Lavinia Ricchiuti, Univ. Politècnica de València (Spain)
Liang Zhang, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
David Barrera, Univ. Politècnica de València (Spain)
Salvador Sales, Univ. Politècnica de València (Spain)
Luc Thévenaz, Ecole Polytechnique Fédérale de Lausanne (Switzerland)

Published in SPIE Proceedings Vol. 9157:
23rd International Conference on Optical Fibre Sensors
José M. López-Higuera; Julian D. C. Jones; Manuel López-Amo; José Luis Santos, Editor(s)

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