Passive star-coupled optical interconnects withwavelength-division multiplexing hold a strong potential for realizingflexible large-scale multicomputer networks. Virtual point-to-pointregular connectivities can be defined and modified in a network withbroadcast-select routing via distributed wavelength assignment to thenodes. The system size in this approach is bound by the number ofseparable wavelength channels. The paper proposes a network class thatachieves scalability by grouping the nodes into clusters and employing aseparate pair of broadcast and select couplers with each cluster.Interconnecting the clusters according to a regular topology results ina modular architecture with reconfigurable partitions and significantlyreduced fiber link density. This approach efficiently combineswavelength-division with direct space interconnection, taking advantageof the properties of each. For the topologies of most significance toparallel computing, the paper studies conflict-free wavelengthassignment that maximizes spatial reuse, identifies the valid networkpartitions, and evaluates the fiber link density and both space andwavelength channel throughput improvement. The results show that cubeand shuffle networks take most advantage of the proposed approach interms of maximizing wavelength reuse
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