A novel 3D stacking method for opto-electronic dies on CMOS ICs

High speed, high density and low cost solution for realizing optical interconnects is presented. An opto-electronic die, directly bonded on top of CMOS IC driver, is connected using metal traces lithographically defined. A twelve channel transmitter based on the technique was fabricated, and test shows good performance up to 12.5 Gb/s/ch.