title: Dynamics of mode-coupling-induced microresonator frequency combs in normal dispersion.
abstract: We experimentally and theoretically investigate the dynamics of microresonator-based frequency comb generation assisted by mode coupling in the normal group-velocity dispersion (GVD) regime. We show that mode coupling can initiate intracavity modulation instability (MI) by directly perturbing the pump-resonance mode. We also observe the formation of a low-noise comb as the pump frequency is tuned further into resonance from the MI point. We determine the phase-matching conditions that accurately predict all the essential features of the MI and comb spectra, and extend the existing analogy between mode coupling and high-order dispersion to the normal GVD regime. We discuss the applicability of our analysis to the possibility of broadband comb generation in the normal GVD regime.
authors.forename: Jae K
authors.initials: JK
authors.lastname: Jang
authors.forename: Yoshitomo
authors.initials: Y
authors.lastname: Okawachi
authors.forename: Mengjie
authors.initials: M
authors.lastname: Yu
authors.forename: Kevin
authors.initials: K
authors.lastname: Luke
authors.forename: Xingchen
authors.initials: X
authors.lastname: Ji
authors.forename: Michal
authors.initials: M
authors.lastname: Lipson
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Gaeta