Petastar: a petabit photonic packet switch

Abstract

Abstract-This paper presents a new petabit photonic packet switch architecture, called PetaStar. Using a new multidimensional photonic multiplexing scheme that includes space, time, wavelength, and subcarrier domains, PetaStar is based on a three-stage Clos-network photonic switch fabric to provide scalable large-dimension switch interconnections with nanosecond reconfiguration speed. Packet buffering is implemented electronically at the input and output port controllers, allowing the central photonic switch fabric to transport high-speed optical signals without electrical-to-optical conversion. Optical time-division multiplexing technology further scales port speed beyond electronic speed up to 160 Gb/s to minimize the fiber connections. To solve output port contention and internal blocking in the three-stage Clos-network switch, we present a new matching scheme, called c-MAC, a concurrent matching algorithm for Clos-network switches. It is highly distributed such that the input-output matching and routing-path finding are concurrently performed by scheduling modules. One feasible architecture for the c-MAC scheme, where a crosspoint switch is used to provide the interconnections between the arbitration modules, is also proposed. With the c-MAC scheme, and an internal speedup of 1.5, PetaStar with a switch size of 6400 6400 and total capacity of 1.024 petabit/s can be achieved at a throughput close to 100% under various traffic conditions. Index Terms-Clos network, optical time-division multiplexing (OTDM), packet scheduling, photonic switch.

Corona: System Implications of Emerging Nanophotonic Technology

“…Most recent optical CMP interconnect proposals rely on electrical arbitration techniques [6,15,28]. Optical arbitration techniques have been investigated in SMP and ATM designs [8,21].…”

A survey on architectures and energy efficiency in Data Center Networks

“…Petabit [35][36] is a full optical switching solution for data center networks based on a bufferless optical switch fabric using commercially available Array Waveguide Grating Router (AWGR) and TWC [37]. The Petabit design objective is to overcome the issues with oversubscription, bottlenecks, latency, wiring complexity and high power consumption.…”

Reprogrammable optical phase array

“…Therefore once aIl electrical conversions are eliminated, there is no longer any ability to store data for traffic management or congestion control. A way to get around this limitation is to move the network control to the edge of the network, as in an all-photonic star configuration [13][14][15]. A star configuration also has the advantage of being easily scalable.…”