Abstract: Fiber-optic sensing of temperature and strain over many advantages over electronic sensors. Fiber optic vibration sensors that use existing fiber optic cables laid for communication have the advantage of being able to collectively and accurately measure vibrations over a wide range along the cables1), 2), and in recent years, they have been attracting attention as a means of environmental. VIAVI provides Distributed Temperature Sensing (DTS), simultaneous Distributed Temperature and Strain Sensing (DTSS) and Distributed Acoustic Sensing (DAS) solutions to measure optical loss, temperature, temperature and strain, or acoustic vibrations with Brillouin OTDR, Raman OTDR and Rayleigh. Fiber-optic distributed acoustic sensing (DAS) and distributed temperature sensing (DTS) systems have been developed for various applications with varied spatial resolution, and spectral and sensing range. Rayleigh scattering-based phase optical time domain reflectometry (OTDR) for vibration and. Optical fiber is characterized as being lightweight, flexible, lightning resistant, long life service, and explosion proof. This solution is used for detecting and monitoring faults or events using values such as the temperature, noise, vibrations, stress or strain depending on the conditions of the. Distributed sensing systems can transform an optical fiber cable into an array of sensors, allowing users to detect and monitor multiple physical parameters such as temperature, vibration and strain with fine spatial and temporal resolution over a long distance.