Abstract
Statistical characteristics of location related intensity distribution in phase-sensitive optical time-domain reflectometry ( $\Phi $ -OTDR) are theoretically analyzed and experimentally demonstrated. The polarization diversity scheme is adopted into the $\Phi $ -OTDR with a coherent detection scheme to effectively mitigate the polarization fading effect. A real distributed sensing application for simultaneous multi-events vibration detection can thus be achieved along each position of the sensing fiber with more reliable vibration detection results. The experiment shows that the signal-to-noise ratio of two vibration signals is simultaneously enhanced by 10.9 and 8.65 dB compared with the results obtained by a conventional coherent detection scheme.
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