23 April 2017 Increasing effective sensing points of Brillouin optical correlation domain analysis using four-wave-mixing process
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238K (2017) https://doi.org/10.1117/12.2265682
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
We propose a novel method to increase sensing points of Brillouin optical correlation domain analysis (BOCDA) by utilizing degenerated four-wave-mixing (FWM) process. A sinusoidally frequency-modulated lightwave is used as the pump of FWM, and the generated idlers have a broadened frequency modulation span. The idlers produced by FWM are used in BOCDA system to increase the sensing points of BOCDA since the number is proportional to the frequency modulation span of the laser source. We experimentally demonstrate a modulation span of 74 GHz by using the firstorder idler produced by FWM process, which is the largest frequency modulation span achieved in BOCDA system, doubling the sensing points of BOCDA from 1936 to 3872. It provides a possibility to use this method in the state-of-art BOCDA system to achieve several millions of effective sensing points.
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Bin Wang, Xinyu Fan, Qingwen Liu, Zuyuan He, "Increasing effective sensing points of Brillouin optical correlation domain analysis using four-wave-mixing process", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238K (23 April 2017); doi: 10.1117/12.2265682; https://doi.org/10.1117/12.2265682
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