In the dispersion-compensating system of the present invention, a
demultiplexer demultiplexes optical signals in a signal wavelength band
of 1520 nm to 1620 nm propagating through a first common transmission
line into C band (1520 nm to 1565 nm) and L band (1565 nm to 1620 nm).
Then, the demultiplexer outputs the optical signals of C band into a
first branched transmission line and the optical signals of L band into a
second branched transmission line. A first dispersion-compensating device
is provided on the first common transmission line and compensates for the
dispersion in C and L bands. A second dispersion-compensating device is
provided on the second branched transmission line and compensates for the
dispersion in L band, which has not fully been compensated for by the
first dispersion-compensating device. Hence, the dispersion of optical
transmission line can fully be reduced in a wide signal light wavelength
band.