WDM especially DWDM is widely used in long haul network because it can extremely expand the band, however in short haul area CWDM is paid attention to be cause its properties.

For the new contract, Dell Perot Systems will continue to provide network operations, desktop services, email, information assurance, telephones, and connectivity to long-haul communications.

With the evolution of metropolitan transmission network and the bandwidth requirement, DWDM technology will be entered into metropolitan network area from long haul backbone network.