Ultra-compact 320 Gb/s and 160 Gb/s WDM transmitters based on silicon microrings

We demonstrated 320Gb/s 8-channel and 160Gb/s 4-channel WDM transmitter using silicon microrings based on conventional common-bus architecture and a new “Mod-MUX” architecture respectively. We discuss and compare the two designs and highlight their complementary merits.