Investigation of mode coupling in normal-dispersion silicon nitride microresonators for Kerr frequency comb generation - Liu, Yang; Xuan, Yi; Xue, Xiaoxiao; Wang, Pei-Hsun; Chen, Steven; Metcalf, Andrew J.; Wang, Jian; Leaird, Daniel E.; Qi, Minghao; Weiner, Andrew M. (Optica, 2014)