High performance CP-ΦOTDR utilizing the negative band

Ji Xiong,Zinan Wang,Yue Wu,Yongxiang Chen,Jiaqi Li,Yunjiang Rao

26th International Conference on Optical Fiber Sensors (2018), paper FB5（2018）

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摘要

With specific IQ-modulation for chirped-probe-pulses and IQ-demodulation for Rayleigh-scattered light, the negative RF band is used for increasing the scan-rate of Φ-OTDR for the first time. Distributed acoustic sensing with sub-nano strain-resolution and high scan-rate is experimentally demonstrated in 75km range.

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