All Fiber Distributed Vibration Sensing Using Modulated Time-Difference Pulses

  title={All Fiber Distributed Vibration Sensing Using Modulated Time-Difference Pulses},
  author={Qian He and Tao Zhu and Xianghui Xiao and Baomei Zhang and Dongmei Diao and Xiaoyi Bao},
  journal={IEEE Photonics Technology Letters},
An optical fiber distributed sensing system merging Mach-Zehnder interferometer (MZI) and phase-sensitive optical time domain reflectometer for vibration measurement with wide frequency response and spatial resolution is proposed and demonstrated. Two acoustic optical modulators are adopted to generate narrow and wide pulses, respectively, on both ends of sensing fiber with a time difference. Narrow pulses are used to generate Rayleigh backscattering light, which locates the vibration point… CONTINUE READING


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