Renjie Yao Yaoyao Ye Weichen Liu Design of a Hierarchical Clos-Benes Optical Network-on-Chip Architecture. 523-528 2019 ISVLSI https://doi.org/10.1109/ISVLSI.2019.00100 conf/isvlsi/2019 db/conf/isvlsi/isvlsi2019.html#YaoYL19