Journal
OPTICS EXPRESS
Volume 21, Issue 14, Pages 16390-16397Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.016390
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Funding
- company OMNISENS (Switzerland)
- Swiss Commission for Technology and Innovation [13122.1]
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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. (C) 2013 Optical Society of America
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