WDM optical transmission method and repeating apparatus for dispersion compensation

摘要

A repeating apparatus disposed at an end point of each divisional repeating interval of a light transmission line performs a first dispersion compensation step (S1), an optical add/drop multiplexing step (S2) and a second dispersion compensation step (S3) to perform repeating transmission. The ratio of an over compensation amount at the second dispersion compensation step (S3) to the sum of dispersion compensation amounts at the first and second dispersion compensation steps (S1 and S2) is set so as to gradually vary together with the transmission distance from the terminal apparatus for transmission at which the repeating apparatus is disposed on the light transmission line so that degradation of wavelengths to be received by the terminal apparatus for reception is suppressed while dispersion compensation is performed with a high degree of accuracy at each optical add/drop multiplexing point on the transmission line.