Optical Routing for 3-D System-On-Package

In this paper, we present the first optical router for 3-D system-on-package (SOP). Recent advances in optical device integration for SOP offer drastic advantages over electrical interconnects. We propose efficient algorithms for the construction of timing and congestion-driven waveguides taking into account the optical resource constraints. Our experimental results suggest that smart placement of waveguides coupled with other routing techniques can reduce electrical wirelength by 11% and improve performance by 23%, when a single optical layer is introduced for every placement layer.