Patent ID: 7512345

Claim:
A wavelength division multiplexing optical transmission system comprising: an optical transmitter for transmitting, to an optical fiber transmission path, a WDM signal which is obtained by multiplexing a plurality of optical signals on the optical fiber transmission path in terms of wavelength, the plurality of optical signals respectively having negative chirps, and the plurality of optical signals differing from one another in wavelength; an optical receiver for receiving the WDM signal from the optical fiber transmission path; and at least one relay node provided between the optical transmitter and the optical receiver, wherein the optical transmitter includes a dispersion adder for beforehand adding a predetermined positive dispersion amount to the WDM signal before the WDM signal is transmitted, and wherein each of the relay nodes and the optical receiver includes a dispersion compensator for compensating a chromatic dispersion suffered in the optical fiber transmission path in the immediately preceding transmission span.