Stability analysis of mode-coupling-assisted microcombs in normal dispersion

We theoretically study the stability of mode-coupling-assisted frequency comb generation in normal-dispersion microresonators. With the aid of mode coupling, quantitative analysis of the modulational instability is explored in the parameter space of pump power and detuning. By exploring the coupled mode number, dispersion, and coupling strength in the normalized Lugiato-Lefever model, the modulational stability gain exists and yields extended spatial structures within the regime of eigenvalue bifurcations. Moreover, the dynamics and efficiency of microcombs are discussed, providing the accessibility of high-efficient, stable, and controllable combs. This work offers universal guidelines for operating mode-coupling-assisted combs in a normal-dispersion system.

Automated summary

We theoretically investigate the stability of mode-coupling-assisted frequency comb generation in normal-dispersion microresonators. Our analysis quantitatively explores the modulational instability in the parameter space of pump power and detuning by considering the coupled mode number, dispersion, and coupling strength in the normalized Lugiato-Lefever model. We find that modulational stability gain exists, leading to extended spatial structures within the regime of eigenvalue bifurcations. Additionally, we discuss the dynamics and efficiency of microcombs, providing guidelines for high-efficient, stable, and controllable combs in a normal-dispersion system.