| 摘要 |
An optical communication system (1) comprising: a first apparatus for supplying at least three optical signals, each having a predetermined wavelength selected from a first range of wavelengths .DELTA..lambda.; an optical transmission line (1000), optically connected to the said first apparatus, for the transmission of the said at least three optical signals, the said optical transmission line (1000) comprising in its turn: i. at leas t one optical amplification system (11) having a predetermined gain spectrum which, in the said first range of wavelengths .DELTA..lambda., has a maximum and a minimum gain (expressed in dB), the difference between the said maximu m and minimum gain being .DELTA.Gtot; and ii. at least one filter (100), associated with the said at least one optical amplification system (11), and capable of attenuating the power of the said at least three optical signals according to a predetermined attenuation curve as a function of the wavelength, the said attenuation curve having, in the said first range of wavelengths .DELTA..lambda., a maximum and a minimum attenuation (expressed in dB), the difference between the said maximum and the said minimum being .DELTA.L; and a second apparatus for receiving the said at least three optic al signals, characterized in that the said power of the said at least three optical signals is associated with a preselected pre-emphasis and the said .DELTA.L is at least 0.5 dB greater than the said .DELTA.Gtot. |
