Patent ID: 6580550
Filing Date: 2003-06-17
Classification: H04B,H04J

Abstract:
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 filter units for compensating for wavelength gain characteristic according to input levels of respective wavelength-band optical signals provided by said demultiplexer; a plurality of optical gain adjusters for adjusting gains of the respective optical signals provided by said filter units; and at least one optical amplifier for amplifying optical signals provided by said optical gain adjusters; 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 characteristic 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 wavelength gain characteristic and a Peltier element in each wavelength gain characteristic shift slope filter is independently controlled in accordance with the input level of the optical signal.