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Flexibility to support mesh topologies, dynamic capacity allocation, and automated network control and light path setup are key elements in the design of next-generation optical transport networks. To realize these capabilities, reconfigurable optical add/drop multiplexers with dynamic add/drop structures, embedded control planes, and lightpath characterization are required. This article presents...
We survey reconfigurable optical add/drop multiplexer (ROADM) architectures that enable efficient and flexible bandwidth utilization in dense wavelength division multiplexed (DWDM) systems. Recent system demonstrations showing the potential of in-service capacity upgrade by using mixed 10-Gb/s, 40-Gb/s, and 100-Gb/s channels in a same network are reviewed.
The relationship is explored between reconfigurable optical add/drop multiplexers, fast becoming the standard nodal subsystem for providing flexibility in modern multichannel fiber optic networks, and wavelength selective switches, the predominant technology used to implement ROADMs.
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