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Reconfigurable optical add/drop multiplexers (ROADMs) are not a new concept – in fact, they've been around for at least four years and have been part of a handful of vendors’ wavelength-division multiplexing (WDM) gear since 2002. Long-haul DWDM (dense WDM) networks have nearly all been built with ROADMs in the past three years, setting the stage for a migration of this function into metro and regional networks as prices fall and network-flexibility requirements rise.
