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Proceedings Paper

Enhancement of signal-to-noise ratio in Brillouin optical time domain analyzers by dual-probe detection
Author(s): Haritz Iribas; Alayn Loayssa; Florian Sauser; Miguel Llera; Sébastien Le Floch
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Paper Abstract

We demonstrate a simple technique to enhance the signal-to-noise ratio (SNR) in Brillouin optical time-domain analysis sensors by the addition of gain and loss processes. The technique is based on the shift of the pump pulse optical frequency in a double-sideband probe system, so that the gain and loss processes take place at different frequencies. In this manner, the loss and the gain do not cancel each other out, and it makes possible to take advantage of both informations at the same time, obtaining an improvement of 3 dB on the SNR. Furthermore, the technique does not need an optical filtering, so that larger improvement on SNR and a simplification of the setup are obtained. The method is experimentally demonstrated in a 101 km fiber spool, obtaining a measurement uncertainty of 2.6 MHz (2σ) at the worst-contrast position for 2 m spatial resolution. This leads, to the best of our knowledge, to the highest figure-of-merit in a BOTDA without using coding or raman amplification.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103237D (23 April 2017); doi: 10.1117/12.2265054
Show Author Affiliations
Haritz Iribas, Univ. Pública de Navarra (Spain)
Alayn Loayssa, Univ. Pública de Navarra (Spain)
Florian Sauser, Haute Ecole Arc Ingénierie (Switzerland)
Miguel Llera, Haute Ecole Arc Ingénierie (Switzerland)
Sébastien Le Floch, Haute Ecole Arc Ingénierie (Switzerland)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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