Compact High-Dimensional Switch Based on a Single Microring Resonator

We propose and demonstrate a compact high-dimensional optical switch based on a single microring resonator (MRR). By fabricating dual-coupled (DC) structures in the MRR, we achieve two-dimensional routing (with 4 switching ports) within a compact footprint of only 64.5×89.5 μm2. Our switch exhibits an insertion loss below 1.00 dB, and isolation ranging from 9.81 dB to 17 dB. Furthermore, through optimized DC-area design, the footprint can be further reduced. Additionally, by increasing the number of DCs, the optical switch can be flexibly scaled to higher dimensions. Our scheme can significantly reduce the size of on-chip optical interconnects, facilitating the development of large-scale ONoCs.