Second-order non-local effects mitigation in BOTDA sensors by tracking the BFS profile

Juan José Mompó; Haritz Iribas; Javier Urricelqui; Alayn Loayssa

doi:10.1117/12.2265099

23 April 2017 Second-order non-local effects mitigation in BOTDA sensors by tracking the BFS profile

Juan José Mompó, Haritz Iribas, Javier Urricelqui, Alayn Loayssa

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103237E (2017) https://doi.org/10.1117/12.2265099
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

We demonstrate a technique to mitigate the residual second-order non-local effects in Brillouin optical time-domain analysis (BOTDA) sensors in which the Brillouin frequency shift (BFS) profile is not uniform along the fiber. It is based on adding a wavelength modulation to the probe wave that makes it track the average BFS found along its way. Using this method we are able to inject a total probe wave power of 15 dBm in a 120-km sensing fiber link, which, to the best of our knowledge, is the highest probe power ever demonstrated in a long-range BOTDA sensing fiber link. The enhancement in the detected signal-to-noise ratio brought by the use of such power provides 2-MHz BFS measurement precision at the end of the 120-km sensing link with 3-m spatial resolution, all without the need to resort to additional means such as the use of coding or Raman gain.

Citation Download Citation

Juan José Mompó, Haritz Iribas, Javier Urricelqui, and Alayn Loayssa "Second-order non-local effects mitigation in BOTDA sensors by tracking the BFS profile", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103237E (23 April 2017); https://doi.org/10.1117/12.2265099

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