Reliable routing in 3D optical Network-on-Chip based on fault node reuse

Recently, the reliable routing has gradually become the main focus in the on-chip communication field, and some solutions have been applied in Network-on-Chips (NoCs). But with the deepening research on Optical NoCs (ONoCs), the superiority of ONoCs is becoming increasingly obvious. As the most efficient on-chip communication way, ONoC also presents some fault situations due to manufacturing defects. To ensure the operating reliability of ONoCs, a novel adaptive reliable routing algorithm NRFTA (Node Reuse Fault Tolerant Algorithm) is designed by us. After extending the internal structure of Optical Routers (ORs), we utilize NRFTA to tolerate arbitrary number/distribution of the faults from microring resonators. NRFTA can find the restore path within each disabled OR, i.e., fault-node reuse, instead of rerouting packets along the restore path detouring around disabled ORs. Thus, the best macroscopic path along with the least ORs is guaranteed by NRFTA. Simulation results demonstrate that NRFTA performs better than benchmarks, in terms of transmission latency and signal-to-noise ratio.