A doubly periodic dispersion map for ultralong-haul 10- and 40-gb/s hybrid DWDM optical mesh networks

A doubly periodic dispersion map scheme is proposed for 10- and 40-Gb/s hybrid dense wavelength-division-multiplexing optical mesh networks, which brings residual dispersion between optical add-drop multiplexers (OADMs) to zero and introduces a certain amount of time delay between odd and even channels at each OADM. This scheme can keep predispersion and postdispersion compensations of 40-Gb/s channels independent on transmission distances, and meanwhile, avoid serious interchannel cross-phase modulation for 10-Gb/s channels. Moreover, same and distance independent predispersion and postdispersion compensations can be used for both 10- and 40-Gb/s channels in this scheme.