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

Marcelo A. Soto; Sébastien Le Floch; Luc Thévenaz

doi:10.1117/12.974974

7 November 2012 Bipolar pulse coding for enhanced performance in Brillouin distributed optical fiber sensors

Marcelo A. Soto, Sébastien Le Floch, Luc Thévenaz

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84219Y (2012) https://doi.org/10.1117/12.974974
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

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.

Citation Download Citation

Marcelo A. Soto, Sébastien Le Floch, and Luc Thévenaz "Bipolar pulse coding for enhanced performance in Brillouin distributed optical fiber sensors", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219Y (7 November 2012); https://doi.org/10.1117/12.974974

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