Abstract
The increasing demand for higher communication bandwidth, reduced power
consumption, and increased reliability combined with fundamental electrical
signalling limitations is leading the drive for optics as an interconnect
technology of choice for high-performance computing (HPC) systems. However,
failure in any optical link can completely disrupt communication by
isolating processing nodes in HPC systems. Moreover, while static allocation
of wavelengths (channels) provides every node with equal opportunity for
communication, it can also lead to network congestion for nonuniform traffic
patterns. In this paper, we propose a multidimensional optoelectronic
architecture, called ${nD}$-reconfigurable, all-photonic interconnect for distributed and
parallel systems (${n}$dimensional-RAPID) where ${n}$ can be 1, 2, or 3. ${nD}$-RAPID exploits optical architecture and technology design space
that simultaneously tackles both fault-tolerance and dynamic bandwidth
reallocation (DBR) of system architecture. Fault-tolerance in ${nD}$-RAPID is enabled through a multidimensional architecture. DBR is
implemented by the row–column switching matrix using
silicon-on-insulator (SOI)-based microring resonators that adapts to changes
in communication patterns at runtime. Simulation results indicate that ${nD}$-RAPID outperformed other electrical networks for most traffic
patterns. Results on DBR show that the proposed row–column switch
organization significantly improves throughput and latency with a slight
increase in electrical power consumption ($\sim$0.4% for the worst case traffic).
© 2009 IEEE
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