Abstract
Extending the sensing distance is of great significance for expanding the application of phase-sensitive optical time-domain reflectometry (φ-OTDR) in remote perimeter monitoring. Due to the inevitable fiber loss, the optical signal intensity decays exponentially with the length of the sensing fiber, and the sensing distance is greatly limited. In this study, a remote-pumped single-ended incident optical signal amplification scheme using erbium-doped fiber (EDF) is reported, and the factors affecting the amplification effect are comprehensively investigated. The experimental results show that the optimal amplification effect can be achieved when the input signal optical power is − 20 dB, the input signal optical wavelength is 1550 nm, the pump power is 100 mW and the erbium-doped fiber length is 10 m.
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