23 April 2017 Brillouin optical time-domain analyzer for extended sensing range using probe dithering and cyclic coding
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103230Q (2017) https://doi.org/10.1117/12.2265426
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
We 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.
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Haritz Iribas, Alayn Loayssa, Florian Sauser, Miguel Llera, 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 (23 April 2017); doi: 10.1117/12.2265426; https://doi.org/10.1117/12.2265426
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