Bipolar optical pulse coding for performance enhancement in BOTDA sensors

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 compl...

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Bibliographic Details
Published in:Optics express 2013-07, Vol.21 (14), p.16390-16397
Main Authors: Soto, Marcelo A, Le Floch, Sébastien, Thévenaz, Luc
Format: Article
Language:English
Subjects:
Computer Simulation
Equipment Design
Equipment Failure Analysis
Fiber Optic Technology - instrumentation
Light
Models, Theoretical
Refractometry - instrumentation
Scattering, Radiation
Signal Processing, Computer-Assisted - instrumentation
Transducers
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Summary: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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.21.016390