Abstract

The observation of dissipative Kerr solitons (DKS) in optical microresonators stimulated active research in fundamental nonlinear optics and enabled numerous applications [1]. Recent advances in silicon nitride-based photonic integrated circuits have enabled the realization of complex resonator structures with low optical parametric oscillation thresholds [2]. However the physics of multiple coupled photonic resonators, which also covers topological photonics, was still far away from the experimental reach, and, thus, DKS at the edge state of topological lattices were mainly studied numerically [^3-5]. Here, we demonstrate the first observation of optical frequency combs (OFC) at the edge state of Su-Schrieffer-Heeger model realized with high-Q Si₃N₄ resonators as shown in Fig. 1a.

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