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The effect of laser frequency drift on the response of Phase-sensitive Optical Time-domain Reflectometer

We present numerical simulations of the Dual-pulse Phase-sensitive Optical Time-domain Reflectometer which response is affected by the laser optical frequency drift. The phase signals retrieved from fixed fiber positions (channels) demonstrate random jumps. Corresponding phase noise spectra approximated by a combination of white noise determined by the laser linewidth and flicker phase noise determined by the laser optical frequency drift rate.