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.

© 2019 Optical Society of America

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