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Fiber optic interconnects baaed on wavelength division multiplezing (WDM) are a promising candidate for future interconnection networks due to their high bandwidth, low wire density and their low power requirements. As the cost of optical communication hardware for WDM star baaed interconnects may be large, we introduce reduced cost structures. The performance of the optical implementations of the reduced cost structures is compared to the electronic implementations for the hypercube topology. The performance is compared in terma of the communication overhead in implementing two commonly used algor i t h m on these structures. Our results indicate that in most situations, the optically implemented reduced cost variations perform better than the electronic amplementatwns. Moreover, the hardware cost-performance trade-ofls show that among the optically implemented schemes, the performance degmdation of the reduced cost variations is not significant in view of the hardware savings involved.

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We evaluate the advantages of reconfigurable optical interconnects within massively parallel systems due to their ability to provide versatile application-dependent network configurations. Furthermore, they are being considered as alternatives to electronic interconnects within high-performance computers because of their advantages of high bandwidth, low wire density and low power requirement at high data rates. Fiber optic interconnects based on wavelength division multiplezing and free-space holographic interconnects are two classes of optical interconnects that can support network reconfiguration. Using computer vision applications, we compare these two classes of optical interconnects with electronic interconnects taking into account the combined effects of link speeds, link latencies, system size, message size and network topologies feasible with current implementation capabilities.