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Updated: Jan 25, 2026

Fiber Optic Distributed Sensors for High-resolution Temperature Field Mapping
Published on: November 7, 2016
Ultra-long-distance (>160 km) distributed optic fiber vibration sensing system without an in-line repeater
Abstract:
We proposed a distributed optic fiber vibration sensing system that can realize a sensing distance of more than 160 km without a repeater. The system's optical structure is based on the Mach-Zehnder and Sagnac hybrid interference technique. To increase the monitoring distance, we used a reflective erbium-doped fiber amplifier (EDFA) instead of a traditional reflector at the end of the sensing system. In addition, a phase-generated carrier was applied to eliminate the parasitic interferometric effects of Rayleigh scattering.
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