Patent ID: 7292748

Claim:
A dispersion-compensating system comprising N dispersion-compensating devices DC 1 to DC N (N≧2) successively provided on a main transmission line between an input end and an output end; and a demultilexer DIV n (2≦n≦N), provided between dispersion-compensatin devices DC n−1 and DC n for demultiplexing an optical signal from said dispersion-compensating device DC n−1 into two wavelength bands, outputting an optical signal in thus demultiplexed one wavelength band to said dispersion-compensating device DC n , and outputting an optical signal in the other wavelength band to a branched transmission line P n ; wherein dispersion of said optical signal in the other wavelength band output from the output end of the branched transmission line P n is compensated for only by the dispersion-compensating devices DC 1 to DC n−1 , and further comprising a demultiplexer DIV 1 , provided in front of the first-stage dispersion-compensating device DC 1 in said N dispersion-compensating devices DC 1 to DC N , for demultiplexing the optical signal fed to said input end, outputting an optical signal in thus demultiplexed one wavelength band to said dispersion-compensating device DC 1 , and outputting an optical signal in the other wavelength band to a branched transmission line P 1 .