Energy-efficient, digitally-driven “fat pipe” silicon photonic circuit switch in the UCSD MORDIA data-center network

Using a compact (0.03 mm^2) silicon photonic thermo-optic switch with five cascaded thermo-topic phase-shifters, we demonstrate low insertion loss, low power, microsecond-scale cross-bar switching of twenty wavelength channels, each carrying 10 Gbit/second data concurrently.