Patent ID: 6404950
Filing Date: 2002-06-11
Classification: G02B

Abstract:
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-&mgr;m 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-&mgr;m 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-&mgr;m 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 an optical fiber formed with a long-period grating in which a propagation mode and a radiation mode are coupled to each other.