Patent ID: 6867909

Claim:
An optical transmission equipment comprising: a demultiplexer for receiving an optical signal including a plurality of different wavelength signals, said demultiplexer demultiplexing the received optical signal into a plurality of predetermined wavelength-band optical signals; a plurality of optical gain adjusters for adjusting gains of the respective optical signals provided by said demultiplexer; a plurality of filter units for compensating for wavelength gain characteristics according to input levels of respective wavelength-band optical signals provided by said optical gain adjusters; and at least one optical amplifier for amplifying optical signals provided by said filter units, wherein said demultiplexer divides the wavelength bands at inflection points of wavelength gain characteristics of said optical gain adjusters, wherein said filter unit includes a plurality of wavelength gain characteristics shift slope filters connected in cascade so as to provide a continuous wavelength gain characteristic, each wavelength gain characteristic shift slope filter including an optical filter which changes wavelength gain characteristic depending on a temperature and a Peltier element for controlling the temperature of the optical filter, wherein the optical filters in respective wavelength gain characteristic shift slope filters are different in wavelenght gain characteristic and a Peltier element in each wavelength gain charachteristic shift slope filter is independently controlled in accordance with the input level of the optical signal.