Balanced detection in Brillouin optical time domain analysis

Alejandro Dominguez-Lopez; Alexia Lopez-Gil; Sonia Martin-Lopez; Miguel Gonzalez-Herraez

doi:10.1117/12.2059295

2 June 2014 Balanced detection in Brillouin optical time domain analysis

Alejandro Dominguez-Lopez, Alexia Lopez-Gil, Sonia Martin-Lopez, Miguel Gonzalez-Herraez

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 915765 (2014) https://doi.org/10.1117/12.2059295
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

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.

Citation Download Citation

Alejandro Dominguez-Lopez, Alexia Lopez-Gil, Sonia Martin-Lopez, and Miguel Gonzalez-Herraez "Balanced detection in Brillouin optical time domain analysis", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915765 (2 June 2014); https://doi.org/10.1117/12.2059295

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