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. Non-intrusive, EMI-resistant vibration sensing for critical infrastructure and harsh environments Optical fiber vibration sensors are transforming how industries monitor structural and mechanical systems in environments where traditional electronic sensors fall short. Using light modulation within. Fiber optic cables used in C-OTDR (DAS) systems are suitable for harsh environmental conditions, such as those encountered in outdoor or industrial settings. Unlike traditional point-type vibration sensors, DVS realizes continuous, real-time. Three sensors presented make use of non-contact vibration measurement method with plastic fiber using distinct designs, improvement of the sensor response and advantages of one sensor over the other for diverse applications. First discussed about dual plastic optical fiber vibration sensor design.