COHERENT OTDR

摘要

PROBLEM TO BE SOLVED: To provide a coherent OTDR (optical time domain reflectometer) capable of switching the on/off state of a dummy light. SOLUTION: This coherent OTDR includes a probe light generator 11 for generating a pulsed probe light PM, having a modulated frequency; a dummy light generator 12 for generating the dummy light DM, having a wavelength which is different from a wavelength of the probe light PM; an optical coupler 13 for superimposing the probe light PMon the dummy light DM; an optical fiber amplifier 14 for amplifying a superimposed light M of the probe light PMand the dummy light DMsuperimposed by the optical coupler 13, and transmitting the light to an optical fiber of an optical submarine cable system 100; an optical filter 15, installed on a subsequent stage of the optical fiber amplifier 14 whose passing band includes the wavelength of the probe light PM; and an instruction part 16 for generating a control signal that controls the wavelength of the dummy light DMas a selection signal S for selecting the blocking or the transmission of the component of the dummy light DMof the superimposed light M amplified by the optical fiber amplifier 14. COPYRIGHT: (C)2009,JPO&INPIT