Abstract
This paper proposes, simulates, and experimentally demonstrates an optical
interconnect architecture for large-scale computing systems. The proposed architecture,
Hierarchical Lightwave Optical Interconnect Network (H-LION), leverages wavelength
routing in arrayed waveguide grating routers (AWGRs), and computing nodes (or servers)
with embedded routers and wavelength-specific optical I/Os. Within the racks and
clusters, the interconnect topology is hierarchical all-to-all exploiting passive AWGRs.
For the intercluster communication, the proposed architecture exploits a flat and
distributed Thin-CLOS topology based on AWGR-based optical switches. H-LION can scale
beyond 100 000 nodes while guaranteeing up to 1.83×saving in number of inter-rack
cables, and up to 1.5×saving in number of inter-rack switches, when compared with a
legacy three-tier Fat Tree network. Network simulation results show a system-wide
network throughput reaching as high as 90% of the total possible capacity in case of
synthetic traffic with uniform random distribution. Experiments show 97% intracluster
throughput for uniform random traffic, and error-free intercluster communication at 10
Gb/s.
© 2015 IEEE
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