Abstract
Optical Network on Chip (ONoC) is an emerging communication architecture since it can potentially offer ultrahigh bandwidth and low latency to multiprocessor systems. With the increasing number of IP cores integrated on a single chip, the design of 3-Dimensional (3D) ONoC has salient strengths in terms of area and cost. Here, a novel 3D ONoC architecture with two layers named 3D Diagonally-Shifted Mesh ONoC (3D-DMONoC) is proposed. Accordingly, two original switching elements with simple structure are put forward to simplify traditional 7×7 optical routers in 3D ONoCs. Accompanied with the employment of wavelength division multiplexing (WDM) technology and wavelength routing scheme, 3D-DMONoC achieves at-most-once turning for the optical signal and avoids wavelength conversion for the communication between any two nodes. The evaluation and simulation results show that the saturation load is improved more than 1.7 times and the saving in the number of microring resonators (MRs) reaches 81.96% at most compared with prior ONoCs.
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