Iribas Pardo, HaritzLoayssa Lara, AlaynSauser, FlorianLlera, MiguelLe Floch, Sébastien2017-05-082017-05-082017Haritz Iribas ; Alayn Loayssa ; Florian Sauser ; Miguel Llera and Sébastien Le Floch: "Brillouin optical time-domain analyzer for extended sensing range using probe dithering and cyclic coding", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103230Q (April 23, 2017); doi:10.1117/12.2265426; http://dx.doi.org/10.1117/12.22654260277-786X (Print)1996-756X (Electronic)10.1117/12.2265426https://academica-e.unavarra.es/handle/2454/24230We present an enhanced performance Brillouin optical time-domain analysis sensor that uses dual probes waves with optical frequency modulation and cyclic coding. The frequency modulation serves to increase the probe power that can be injected in the fiber before the onset of non-local effects and noise generated by spontaneous Brillouin scattering. This leads to higher detected signal-to-noise ratio (SNR), which is further increased by the coding gain. The enhanced SNR translates to extended range for the sensor, with experiments demonstrating 1-m spatial resolution over a 164 km fiber loop with a 3-MHz Brillouin frequency shift measurement precision at the worst contrast position. In addition, we introduce a study of the power limits that can be injected in the fiber with cyclic coding before the appearance of distortions in the decoded signal.application/pdfengCopyright 2017 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction 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 analysisCyclic codinginfo:eu-repo/semantics/conferenceObjectAcceso abierto / Sarbide irekiainfo:eu-repo/semantics/openAccess