DISPERSION COMPENSATION SYSTEM

摘要

A demultiplexer in a dispersion compensation system of the invention separat es an optical signal in a 1520-1620 nm band propagating through a first common transmission path into two bands, i.e., C band (1520-1565 nm) and L band (15 65- 162O nm). The demultiplexer then sends the optical signal in the C band and the optical signal in the L band to a first branch path and a second branch path, respectively. A first dispersion compensation device is provided in th e first common transmission path to compensate for dispersion in the C and L bands. A second dispersion compensation device is provided in the second branch path to compensate for dispersion in the L band if the dispersion compensation by the first dispersion compensation device is insufficient. It is thus possible to sufficiently compensate for the dispersion of an optical transmission path in a wide signal band.