In this paper, various technologies of distributed fiber-optic vibration sensing are reviewed, from interferometric sensing technology, such as Sagnac, Mach–Zehnder, and Michelson, to backscattering-based sensing technology, such as phase-sensitive optical time domain. In this paper, various technologies of distributed fiber-optic vibration sensing are reviewed, from interferometric sensing technology, such as Sagnac, Mach–Zehnder, and Michelson, to backscattering-based sensing technology, such as phase-sensitive optical time domain. A fast demodulation method based on phase shift integration (PSI) is proposed for fiber-optic vibration sensors with heterodyne detection, which effectively accelerates the phase demodulation process of the sensing system. The PSI-based principle utilizes the phase relationship between adjacent. Distributed fiber-optic vibration sensors receive extensive investigation and play a significant role in the sensor panorama.
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