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LIONS: An AWGR-Based Low-Latency Optical Switch for High-Performance Computing and Data Centers

2012; IEEE Photonics Society; Volume: 19; Issue: 2 Linguagem: Inglês

10.1109/jstqe.2012.2209174

1558-4542

Yawei Yin, Roberto Proietti, Xiaohui Ye, Christopher Nitta, Venkatesh Akella, S. J. Ben Yoo,

Interconnection Networks and Systems

This paper discusses the architecture of an arrayed waveguide grating router (AWGR)-based low-latency interconnect optical network switch called LIONS, and its different loopback buffering schemes. A proof of concept is demonstrated with a 4 × 4 experimental testbed. A simulator was developed to model the LIONS architecture and was validated by comparing experimentally obtained statistics such as average end-to-end latency with the results produced by the simulator. Considering the complexity and cost in implementing loopback buffers in LIONS, we propose an all-optical negative acknowledgement (AO-NACK) architecture in order to remove the need for loopback buffers. Simulation results for LIONS with AO-NACK architecture and distributed loopback buffer architecture are compared with the performance of the flattened butterfly electrical switching network.