Bipolar pulse coding for enhanced performance in Brillouin distributed optical fiber sensors

We propose and experimentally demonstrate the possibility to use a pump signal based on bipolar pulse sequences using single-sideband suppressed-carrier (SSB-SC) modulation in Brillouin optical time-domain analysis (BOTDA) sensors. The SSB-SC modulated pump makes a sequential use of the Brillouin gain and loss spectra, increasing the intensity contrast of the measurements. The method is demonstrated using bipolar Golay codes along a 50 km sensing fiber and 2 m spatial resolution. Results indicate that the use of bipolar sequences provides a higher SNR enhancement and stronger robustness to pump depletion in comparison to BOTDA systems employing conventional unipolar sequences.


Published in:
Proc. SPIE 8421
Presented at:
OFS2012 22nd International Conference on Optical Fiber Sensors, Beijing, China, 15-19 October 2012
Year:
2012
Publisher:
Bellingham, Spie-Int Soc Optical Engineering
ISBN:
978-0-8194-9103-9
Keywords:
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 Record created 2012-12-13, last modified 2018-03-18

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