Investigation of Mode Interaction in Optical Microresonators for Kerr   Frequency Comb Generation
  Mode interaction in silicon nitride micro-resonators is investigated. We provide clear experimental evidence of mode interaction between two family modes and mode interaction is demonstrated to be the cause of the comb generation in resonators with normal dispersion. 
Yang Liu, Yi Xuan, Xiaoxiao Xue, Pei-Hsun Wang, Andrew J. Metcalf,   Steve Chen, Minghao Qi, and Andrew M. Weiner
physics.optics