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To cater to the demands of our rapidly growing Internet traffic, backbonenetworks need high-degree reconfigurable optical add/drop multiplexers (ROADMs)to simultaneously support multiple pairs of bi-directional fibers on each link.However, the traditional ROADM architecture based on the Spanke network is toocomplex to be directly scaled up to construct high-degree ROADMs. In addition,the widely deployed Spine-Leaf datacenter networks (DCNs) based on electricalswitches consume too much power and exhibit high packet latency. Because ofthese issues, Clos networks are considered as promising alternatives forconstructing large-scale ROADMs and all-optical DCNs. In this article, we lookat a next-generation Clos-based ROADM architecture and show that it indeedprovides better blocking performance with lower element and fiber complexitiescompared with a traditional Spanke-based ROADM architecture. We also discussthe application of a Clos network in all-optical DCNs to show that it can beused to effectively construct large-scale DCNs with significantly greaterflexibility in supporting a variety of multicast services and in combiningdifferent network topologies.

From Small to Large: Clos Network for Scaling All-Optical Switching