MULTIWAVELENGTH SIMULTANEOUS MEASUREMENT OTDR AND MULTIWAVELENGTH SIMULTANEOUS OTDR MEASURING METHOD

摘要

PROBLEM TO BE SOLVED: To enable shortening of measurement time and enhancement of work efficiency by separating backscattered light of each wavelength without using a wavelength filter and by simultaneously conducting multiwavelength optical pulse testing.;SOLUTION: A multiwavelength simultaneous measurement OTDR relating to the invention comprises: a random code generator 11 for generating two or more mutually-different random codes; multiple light sources 13_1 to 13_N with different wavelengths; a multiplexer 21 for multiplexing test light from the light sources; an optical coupler 14 for outputting the multiplexed light to a measured optical fiber 93 and receiving input of backscattered light from the measured optical fiber 93; an optical receiver 16 for receiving the backscattered light; a DC cut circuit 17 for cutting a direct-current component; an AD conversion circuit 19 for converting an alternate-current component into a digital signal; and a correlator 20 for calculating a correlation between the digital signal and each of the random codes.;COPYRIGHT: (C)2013,JPO&INPIT