Patent ID: 7085039

Claim:
A transmission system having a dispersion map, said transmission system comprising: a transmitter and a receiver; a transmission path between said transmitter and said receiver, said transmission path comprising: a first group of composite fiber spans including a combination of positive dispersion fibers and negative dispersion fibers and having a residual positive dispersion; at least one compensating span following said first group of composite fiber spans, said compensating span including negative dispersion fibers; and a second group of composite fiber spans following said compensating span, said composite fiber spans in said second group including a combination of positive dispersion fibers and negative dispersion fibers and having a residual positive dispersion; and a plurality of hybrid Raman-EDFAs connected respectively between said fiber spans, each of said Raman-EDFAs including a Raman section and an EDFA section, wherein each said Raman section is coupled to negative dispersion fibers of a respective one of said fiber spans.