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Abstract

The present invention relates to a WDM optical communication system comprising a structure which effectively suppresses the waveform deterioration resulting from nonlinear optical phenomena of each signal in a 1.58-.mu.m wavelength band in an optical transmission line including a dispersion-shifted optical fiber having a zero-dispersion wavelength in a 1.55-.mu.m wavelength band. The WDM optical communication system includes a hybrid transmission unit in which a single-mode optical fiber and a dispersion-shifted optical fiber are arranged such that signals successively pass therethrough. The single-mode optical fiber has a zero-dispersion wavelength in a 1.3-.mu.m wavelength band and an effective area A.sub.SMF at a wavelength of 1.58 .mu.m. The dispersion-shifted optical fiber has a zero-dispersion wavelength in the 1.55-.mu.m wavelength band and, at a wavelength of 1.58 .mu.m, a dispersion with an absolute value of 0.5 ps/nm/km or more and an effective area A.sub.DSF smaller than the effective area A.sub.SMF of the single-mode optical fiber.

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