23 April 2017 Second-order non-local effects mitigation in BOTDA sensors by tracking the BFS profile
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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.
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Juan José Mompó, Juan José Mompó, Haritz Iribas, Haritz Iribas, Javier Urricelqui, Javier Urricelqui, Alayn Loayssa, 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); doi: 10.1117/12.2265099; https://doi.org/10.1117/12.2265099
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