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. This paper proposes a high-sensitivity and sensitivity-tunable vibration sensing system based on a switchable loop length optoelectronic oscillator (OEO). Carrier-sideband separation is realized by using an acousto-optic modulator (AOM), and the resonant cavity length is designed to be independent. The Fiber Optic Sensing Association (FOSA) is dedicated to accelerating the use of distributed and quasi-distributed optical fiber sensing technologies.
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Every meter of the optical fiber acts as a detection node, ensuring no blind spots from portal to portal. Real-Time Event Localization The system can pinpoint the exact position of a vibration, heat source, or strain change—often within ±1–2 meters. Fibre optic tunnels, tunnel fibre installations and tunnel network security demand specialised vibration-resistant fibre optic solutions with IP65 protection rating and EMC resilience that operate reliably even at extreme temperature variations from -40°C to +85°C. This precision accelerates response and minimizes. First, by arranging distributed optical fibers along the longitudinal length of a tunnel, dynamic strain vibration signals are extracted via phase-sensitive optical time-domain reflectometry analysis, and analysis of variance (ANOVA) and Pearson correlation analysis are used to jointly downscale.
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