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Proceedings Paper

Pulse shapes effects on backscattering Brillouin gain for distributed fiber sensing
Author(s): C. Galíndez; J. M. Lázaro; P. B. García-Allende; F. Madruga; J. M. López-Higuera
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Paper Abstract

Distributed fiber sensing based on Brillouin gain scattering (BGS) principle is a useful way to develop devices capable to measure temperature and/or strain in optical fibers. In these distributed sensors, spatial resolution is a topic of special interest in the distributed fiber sensing field. The influence of the probe-pulse shape in the interaction between the pulsed light and the continuous wave laser in a pump-probe system. This study has the purpose of improving the spatial resolution of the measurement without losing stability in the BGS is presented. Also it is showed how the backscattering Brillouin gain is affected by inducing variations on the final value of the BGS intensity. Theoretical analysis of the probe pulse in the Brillouin shift and intensity values using triangular, sinusoidal and saw tooth shapes around the phonon lifetime (~10ns) are presented; and also considerations and conclusions are explained.

Paper Details

Date Published: 2 July 2007
PDF: 4 pages
Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 66193A (2 July 2007); doi: 10.1117/12.738669
Show Author Affiliations
C. Galíndez, Univ. de Cantabria (Spain)
J. M. Lázaro, Univ. de Cantabria (Spain)
P. B. García-Allende, Univ. de Cantabria (Spain)
F. Madruga, Univ. de Cantabria (Spain)
J. M. López-Higuera, Univ. de Cantabria (Spain)

Published in SPIE Proceedings Vol. 6619:
Third European Workshop on Optical Fibre Sensors

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