Optical interconnects are useful for high-performance electronic computing systems when the number-ofchannels, the bit-rate per channel, the channel density, and the communication distance of electrical links are simultaneously stressed. We review the near-term and longer term opportunities for optical communication at the chassis, chip-package and silicon micro-system levels. 							
						
							
					 															
					Ashok V. Krishnamoorthy, Jon Lexau, Xuezhe Zheng,