Wiring optimization for propagation delay and reduced power consumption in multichip modules with free-space optical interconnect

In this paper, we develop "GOETHE" (Generic Opto-Electronic system design THEurgist), a computer-aided design (CAD) tool for physical placement and routing in multichip modules (MCMs) manufactured using free-spice optical interconnect technology. GOETHE determines the optimal module placement with the minimum propagation delay without exceeding the routing capacity of the optical substrate while reducing power consumption. More than 62% reduction in propagation delay and more than 27% reduction in power consumption is obtained through the use of free-space optical interconnect. It turns out that chip speed can be improved by a factor of 1.5 (with less power consumption) compared to MCMs with only electrical interconnections.