WDM optical transmission system and an optical transmission line thereof

摘要

An object of the present invention is to realize almost the same transmission characteristic in all wavelengths at a transmission rate of 10Gb/s or more. An optical transmitter 10 outputs WDM signal light multiplexed with signal light of a plurality of wavelengths toward an optical transmission line 12. The optical transmission line 12 comprises an optical transmission fiber 14, an optical repeating amplifier 16 and a dispersion compensating fiber 18. The gain characteristic of the optical repeating amplifier 16 is set so that the gain becomes the maximum at the effective zero dispersion wavelength of the optical transmission line 12 and that lowers inversely proportional to the distance from the effective zero dispersion wavelength. The whole optical transmission line 12 is set so that the peak power deviation between the effective zero dispersion wavelength lambda 0 and the wavelength lambda 1 or lambda n on both end becomes approximately 4 dB.