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Distributed detection and localization of multiple dynamic perturbations using coherent correlation OTDR

A novel technique for distributed disturbance sensor is presented. It is based on Coherent Correlation OTDR operating in CW regime. The sensor utilizes a standard telecom CW DFB diode laser as a light source and a very simple configuration. Probe signals were generated by interferometer with OPD exceeding the coherence length of the laser light. Speckle-like OTDR traces were obtained by calculating cross-correlation function between the probe light intensity signal and the signal returned back from the sensing fiber. Perturbations are detected as time variation of correlation amplitude at disturbance locations. Preliminary experiments proved operability of the sensor.