Broadband Reversed Fano Switch Based on a Ring-Bus-Ring-Bus System

We have proposed and experimentally demonstrated a broadband thermo-optic switch in silicon-on-insulator. The switch is based on a ring-bus-ring-bus system, which can generate reversed Fano lineshapes in the transmission spectra. Then, the fabricated device exhibits a 3-dB-bandwidth more than 280 GHz, a maximum extinction ratio of 28 dB, and a slope rate of 60.8 dB/nm. In addition, the simulation results reveal that the switch is capable of switching data rates as high as 320 Gb/s with negligible signal distortion.