Scalable optical packet switch architecture for low latency and high load computer communication networks

N. Calabretta, S. Di Lucente, Y. Nazarathy, O. Raz, H.J.S. Dorren

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

3 Citations (Scopus)


High performance computer and data-centers require PetaFlop/s processing speed and Petabyte storage capacity with thousands of low-latency short link interconnections between computers nodes. Switch matrices that operate transparently in the optical domain are a potential way to efficiently interconnect 1000's of inputs/outputs, complying the end-to-end latency (~1 µs) of these systems. Current rearrangeable non-blocking switches architectures (Benes, Omega, etc..) have a reconfiguration time (expressed in clock-cycles) at most of Mog2(N), N is the number of nodes. Assuming a clock cycle of 1 ns, it follows that the latency requirement cannot be met for N >; 100. Moreover, being the switch disable during this time, the packets are either lost or buffered, limiting the maximum load of the system. In this work we present a new strictly non-blocking switch architecture with a contention resolution sub system. Key point is that the new architecture supports highly distributed control that allows for reduction of the switching time to few nanoseconds regardless the N input/output nodes. Thus, the architecture can meet the latency requirement without limiting the load of the system.
Original languageEnglish
Title of host publicationProceedings of the 13th International Conference on Transparent Optical Networks (ICTON), 26-30 June 2011,Stockholm, Sweden
Place of PublicationStockholm, Sweeden
Publication statusPublished - 2011


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