Analytical expression and experimental validation of the Brillouin gain spectral broadening at any sensing spatial resolution

Mehdi Alem; Marcelo A. Soto; Moshe Tur; Luc Thévenaz

doi:10.1117/12.2267639

23 April 2017 Analytical expression and experimental validation of the Brillouin gain spectral broadening at any sensing spatial resolution

Mehdi Alem, Marcelo A. Soto, Moshe Tur, Luc Thévenaz

Author Affiliations +

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103239J (2017) https://doi.org/10.1117/12.2267639
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

A novel and simple analytical expression to describe the Brillouin gain spectral broadening as a function of the spatial resolution in time-domain Brillouin distributed fiber sensors is deduced. The proposed model is experimentally validated using a pump-probe Brillouin sensing setup and also compared with numerical and approximate results. In addition, a compact mathematical form is presented for the peak gain reduction resulting from incomplete acoustic-wave activation in Brillouin sensors with short spatial resolution. Both mathematical expressions can be used together to quantitatively predict the impact of the spatial resolution on the signal-to-noise ratio and frequency uncertainty of the sensor.

Citation Download Citation

Mehdi Alem, Marcelo A. Soto, Moshe Tur, and Luc Thévenaz "Analytical expression and experimental validation of the Brillouin gain spectral broadening at any sensing spatial resolution", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103239J (23 April 2017); https://doi.org/10.1117/12.2267639

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