Gain vs phase in BOTDA setups

Alexia Lopez-Gil; Xabier Angulo-Vinuesa; Marcelo A. Soto; Alejandro Dominguez-Lopez; Sonia Martin-Lopez; Luc Thévenaz; Miguel Gonzalez-Herraez

doi:10.1117/12.2236890

30 May 2016 Gain vs phase in BOTDA setups

Alexia Lopez-Gil, Xabier Angulo-Vinuesa, Marcelo A. Soto, Alejandro Dominguez-Lopez, Sonia Martin-Lopez, Luc Thévenaz, Miguel Gonzalez-Herraez

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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 991631 (2016) https://doi.org/10.1117/12.2236890
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland

Abstract

We evaluate the Brillouin frequency shift (BFS) determination error when using the Brillouin phase spectrum (BPS) instead of the Brillouin gain spectrum (BGS) in BOTDA setups. We compare the error obtained in the BFS determination in both cases, both with theoretical arguments and experimental data. In comparison to the gain, for an equal SNR and linewidth, the phase generally provides a better fit of the BFS for smaller frequency spans. This result opens a possible way to reduce the measurement time of certain BOTDA systems by using the phase feature.

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Alexia Lopez-Gil, Xabier Angulo-Vinuesa, Marcelo A. Soto, Alejandro Dominguez-Lopez, Sonia Martin-Lopez, Luc Thévenaz, and Miguel Gonzalez-Herraez "Gain vs phase in BOTDA setups", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 991631 (30 May 2016); https://doi.org/10.1117/12.2236890

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