Comparison of ring resonator and Mach-Zehnder photonic switches integrated with digital CMOS drivers

We report a low-power silicon photonic ring-resonator switch integrated with a CMOS driver that achieves sub 3.5-ns transition times, below -20-dB crosstalk, and ~1-mW combined switch and driver power consumption. Results are compared to non-resonant Mach-Zehnder based switches.