BOTDA measurements tolerant to non-local effects by using a phase-modulated probe wave and RF demodulation

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Date
2013Version
Acceso abierto / Sarbide irekia
Type
Artículo / Artikulua
Version
Versión publicada / Argitaratu den bertsioa
Impact
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10.1364/OE.21.017186
Abstract
We demonstrate a Brillouin optical time domain analysis sensor based on a phase modulated probe wave and RF demodulation that provides measurements tolerant to frequency dependent variations of the pump pulse power induced by non local effects. The tolerance to non local effects is based on the special characteristics of the detection process, which provides an RF phase shift signal that is large ...
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We demonstrate a Brillouin optical time domain analysis sensor based on a phase modulated probe wave and RF demodulation that provides measurements tolerant to frequency dependent variations of the pump pulse power induced by non local effects. The tolerance to non local effects is based on the special characteristics of the detection process, which provides an RF phase shift signal that is largely independent of the Brillouin gain magnitude. Proof of concept experiments performed over a 20 km long fiber demonstrate that the measured RF phase shift spectrum remains unaltered for large frequency dependent deformations of the pump pulse power. Therefore, it allows the use of a higher optical power of the probe wave, which leads to an enhancement of the detected signal to noise ratio. This can be used to extend the sensing distance, to improve the accuracy of the Brillouin frequency shift measurements, and to reduce the measurement time. [--]
Subject
Stimulated Brillouin scattering,
Fiber optics sensors,
Heterodyne,
Brillouin distributed sensors,
Brillouin optical time domain analysis
Publisher
Optical Society of America
Published in
Optics Express, Vol. 21, Issue 14, pp. 17186-17194 (2013)
Departament
Universidad Pública de Navarra. Departamento de Ingeniería Eléctrica y Electrónica /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Elektrikoa eta Elektronikoa Saila
Publisher version
Sponsorship
The authors wish to acknowledge the financial support from the Spanish Ministerio de
Educación y Ciencia through the project TEC2010-20224-C02-01, from the Spanish
Ministerio de Economía y Competitividad through the project IPT-2011-12-920000 and from
the Universidad Pública de Navarra.