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Published in: Optics Express (ISSN: 1094-4087), vol. 21, num. 14, p. 16390 Washington: Optical Society of America, 2013

A pump signal based on bipolar pulse coding and single-sideband suppressed-carried (SSB-SC) modulation is proposed for Brillouin optical time-domain analysis (BOTDA) sensors. Making a sequential use of the Brillouin gain and loss spectra, the technique is experimentally validated using bipolar complementary-correlation Golay codes along a 100 km-long fiber and 2 m spatial resolution, fully resolving a 2 m hot-spot at the end of the sensing fiber with no distortion introduced by the decoding algorithm. Experimental results, in good agreement with the theory, indicate that bipolar Golay codes provide a higher signal-to-noise ratio enhancement and stronger robustness to pump depletion in comparison to optimum unipolar pulse codes known for BOTDA sensing.

Reference EPFL-ARTICLE-187408doi:10.1364/OE.21.016390View record in Web of Science

Autor: Soto, Marcelo A.; Le Floch, Sébastien; Thévenaz, Luc


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