A passive all-silicon optical diode is demonstrated to realize a record high nonreciprocal transmission ratio (NTR) of 40 dB. Individual microrings that make up the device are experimentally studied to explain the nonlinear power dynamics. There is a compromise between the NTR and insertion loss, and possible solutions for further improvements are discussed. This work provides a way to realize extremely high optical nonreciprocity on chip for optical information processing applications.
© 2013 Optical Society of America
Original Manuscript: January 23, 2013
Revised Manuscript: February 28, 2013
Manuscript Accepted: March 8, 2013
Published: April 4, 2013
Li Fan, Leo T. Varghese, Jian Wang, Yi Xuan, Andrew M. Weiner, and Minghao Qi, "Silicon optical diode with 40 dB nonreciprocal transmission," Opt. Lett. 38, 1259-1261 (2013)