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Proceedings Paper

Balanced detection in Brillouin optical time domain analysis
Author(s): Alejandro Dominguez-Lopez; Alexia Lopez-Gil; Sonia Martin-Lopez; Miguel Gonzalez-Herraez
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Paper Abstract

We propose the use of balanced detection in Brillouin Optical Time Domain Analysis (BOTDA) sensors. Balanced detection can be effectively accomplished among the Stokes and anti-Stokes bands in the probe signal. This type of detection leads to a doubling of the trace amplitude and at least a √2 increase in signal to noise ratio over the conventional configuration. Moreover, it leads to a complete cancellation of the common-mode noise in the probe signal, including relative intensity noise in Raman-assisted configurations. We show all these benefits both theoretically and experimentally.

Paper Details

Date Published: 2 June 2014
PDF: 4 pages
Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915765 (2 June 2014); doi: 10.1117/12.2059295
Show Author Affiliations
Alejandro Dominguez-Lopez, Univ. de Alcalá (Spain)
Alexia Lopez-Gil, Univ. de Alcalá (Spain)
Sonia Martin-Lopez, Univ. de Alcalá (Spain)
Miguel Gonzalez-Herraez, Univ. de Alcalá (Spain)

Published in SPIE Proceedings Vol. 9157:
23rd International Conference on Optical Fibre Sensors
José M. López-Higuera; Julian D. C. Jones; Manuel López-Amo; José Luis Santos, Editor(s)

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