Gain dependence of measured spectra in coherent Brillouin optical time-domain analysis sensors

Jon Mariñelarena; Javier Urricelqui; Alayn Loayssa

doi:10.1117/12.2236931

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30 May 2016 Gain dependence of measured spectra in coherent Brillouin optical time-domain analysis sensors

Jon Mariñelarena, Javier Urricelqui, Alayn Loayssa

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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 991636 (2016) https://doi.org/10.1117/12.2236931
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

We report on the effects of large pump pulse powers on Brillouin optical time-domain analysis (BOTDA) sensors based on phase-modulated probe wave and coherent detection. It is found that the large Brillouin gain that comes from the use of high power pulses induces a narrowing of the RF phase-shift spectrum that is measured in these sensors. This narrowing leads to a Brillouin frequency shift measurement error when the sensor is configured for dynamic measurements. However, the effect has been found to be less significant than that observed in dynamic slope-assisted BOTDA sensors based on amplitude.

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Jon Mariñelarena, Javier Urricelqui, and Alayn Loayssa "Gain dependence of measured spectra in coherent Brillouin optical time-domain analysis sensors", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991636 (30 May 2016); https://doi.org/10.1117/12.2236931

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