Patent ID: 6603585
Filing Date: 2003-08-05
Classification: H04B,H04J

Abstract:
An optical communication system comprising:(a) a first apparatus for supplying at least three optical signals, each having a predetermined wavelength selected from a first range of wavelengths &Dgr;&lgr; and a preselected optical power; (b) an optical transmission line optically connected to said first apparatus, for the transmission of the at least three optical signals, said optical transmission line comprising: i.) at least one optical amplification system having a predetermined gain spectrum which, in said first range of wavelengths &Dgr;&lgr;, has a maximum and a minimum gain, the difference between the maximum and minimum gain being &Dgr;Gtot, and ii.) at least one filter associated with said at least one optical amplification system and capable of attenuating said optical power of the at least three optical signals according to a predetermined attenuation curve as a function of the wavelength, the attenuation curve having, in said first range of wavelengths &Dgr;&lgr;, a maximum and a minimum attenuation, the difference between the maximum and the minimum being &Dgr;L; and c) a second apparatus for receiving the at least three optical signals, wherein said power of the at least three optical signals is associated with a preselected pre-emphasis and the &Dgr;L is at least 0.5 dB greater than &Dgr;Gtot.