Exploring and optimizing crosstalk effect in VCmesh-based optical networks-on-chip

As a new trend on-chip interconnection technology, optical networks-on-chip (ONoCs), utilizes photonic replaces traditional electronic medium to break through the bottleneck of metallic interconnection in terms of transmission latency, bandwidth, integration and power dissipation. Nevertheless, Owing to on-chip large-scale integration of basic optical switch elements (BOSEs), the accumulation of crosstalk in the process of signal propagation between the source node and the destination node has become one of the key problems that plague ONoCs. VCmesh-based ONoCs exhibits outstanding connectivity depending on a dual-layers architecture design approach. In this paper, in order to obtain higher communication reliability, we adopt an angle optimization method to adjust the BOSEs waveguide crossing angle from general 90 ° to 60 ° or 120 °, and establish a numerical theoretical analysis model of crosstalk noise effect for the VCmesh-based ONoCs. In conclusion, the numerical simulation results show that the angle optimization approach can effectively improve the worst-case optical Signal-Noise-Ratio (OSNR) and reduce the Bit-Error-Rate (BER).