Abstract

Optical technology is being promoted as a highly promising, energy-efficient interconnect solution for next generation data centers and high performance computing systems. To overcome the energy and bandwidth limitations of electrical interconnects, all-optical technologies will be deployed at even shorter distances in the near future (board-to-board, on-board, and on-chip). On-board layout models for electronic interconnects, including the Thompson model [J. Comput. System Sci. , vol.  28, no. 2, pp. 300, 1984 [CrossRef]  ], have long been proposed in the literature and corresponding area-efficient layouts have been found [Int. Conf. Parallel Processing, 2000] for a number of popular topologies. However, optical on-board interconnects have important differences from electrical ones, requiring the introduction of appropriate layout models for them. In this work, we look into the differences between electronic and optical on-board layouts, and propose optical interconnection layout models. In particular, we examine λ-routing grids for on-board optical interconnects in which routing options other than the traditional vertical–horizontal one are used (λ is the number of permitted routing options). We define 2D mesh topologies, based on the proposed λ-routing grids, achieving better bisection width and bisection width over area ratios than with rectangular (λ=2) grids. We also propose topologies with high connectivity degrees that fit the examined λ-routing grids and present their on-board layouts.

© 2018 Optical Society of America

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