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Several recent research efforts have applied Optical Circuit Switching (OCS) to data center networks. The Helios prototype promises massive scalability with large reductions in equipment cost, power consumption, and quantities of fiber by strategically combining electrical packet switching and optical circuit switching. This paper identifies hardware requirements for optically circuit-switched data center networks with the goal of achieving nearly the same performance as pure Electronic Packet Switched (EPS) networks. The authors focus on optical communications inside the data center, complementing earlier work for communications between data centers.
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