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With the explosion of capacity demands driven by the Internet, optical networking systems are experiencing tremendous growth and are providing increasingly high transmission capacities. As importantly, with the advent of the optical amplifier and wavelength division multiplexing (WDM), optics is playing a larger role in networking and is extending further to the edge of the network. Once limited to long-haul point-to-point systems, Lucent Technologies is now commercializing multipoint metro WDMdoi:10.1002/bltj.2214 fatcat:jbu2q5suung7loqm7y2hcxaiwi