23 April 2017 Increasing the frequency response of direct-detection phase-sensitive OTDR by using frequency division multiplexing
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Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103238F (2017) https://doi.org/10.1117/12.2265632
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of
Abstract
The frequency division multiplexing (FDM) technique is firstly introduced into a direct-detection phase-sensitive OTDR to improve the distributed fiber acoustic sensing performance by using a frequency step sweeping laser source and a dual probe pulse scheme. By using FDM technique, a 40 kHz sampling rate to vibration is realized with a 10 km measurement range, which implies the tradeoff between the frequency response and the measurement range is broken. In experiment, a 6 kHz vibration is successfully measured.
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Guangyao Yang, Xinyu Fan, Qingwen Liu, Zuyuan He, "Increasing the frequency response of direct-detection phase-sensitive OTDR by using frequency division multiplexing", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103238F (23 April 2017); doi: 10.1117/12.2265632; https://doi.org/10.1117/12.2265632
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