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Proceedings Paper

Bipolar pulse coding for enhanced performance in Brillouin distributed optical fiber sensors
Author(s): Marcelo A. Soto; Sébastien Le Floch; Luc Thévenaz
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Paper 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.

Paper Details

Date Published: 7 November 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84219Y (7 November 2012); doi: 10.1117/12.974974
Show Author Affiliations
Marcelo A. Soto, Swiss Federal Institute of Technology (Switzerland)
Sébastien Le Floch, HE-ARC (Switzerland)
Luc Thévenaz, Swiss Federal Institute of Technology (Switzerland)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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