Patent ID: 6853766

Claim:
A dispersion-compensating module to be installed at a predetermined position on an optical transmission line having a predetermined length, said dispersion-compensating module having a positive loss slope in a 1.55-μm wavelength band and constituting a part of said optical transmission line, said dispersion-compensating module comprising: a dispersion-compensating device for compensating for the dispersion of said optical transmission line in the 1.55-μm wavelength band; and a loss-equalizing device for adjusting the total loss slope of said optical transmission line including said dispersion-compensating module such that a loss deviation between individual signal wavelengths in the 1.55-μm wavelength band caused by propagation in said optical transmission line and dispersion-compensating device falls within an appropriate range, wherein said loss-equalizing device includes a slant type fiber grating.