Mompó Roselló, Juan JoséIribas Pardo, HaritzUrricelqui Polvorinos, JavierLoayssa Lara, Alayn2019-04-152019-04-152017Juan José Mompó, Haritz Iribas, Javier Urricelqui, 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).0277-786X (Print)1996-756X (Electronic)10.1117/12.2265099https://academica-e.unavarra.es/handle/2454/32900We 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.application/pdfengCopyright 2017 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic re-production and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.Brillouin distributed sensorsBrillouin optical time domain analysisFiber optics sensorsinfo:eu-repo/semantics/conferenceObjectinfo:eu-repo/semantics/openAccess