Random coding method for coherent detection φ-OTDR without optical amplifier
Optics and Lasers in Engineering（2023）
Abstract
•Random coding method can bring SNR enhancement without loss of the sensing bandwidth.•The sensing distance can be extended without any light amplification.•System hardware is optimized and the cost is reduced.
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Key words
Distributed optical fiber vibration sensor,Phase-sensitive optical time domain reflectometry,Pulse coding,Random coding pulse
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