On the spontaneous time-reversal symmetry breaking in synchronously-pumped passive Kerr resonators

TL;DR

This paper investigates the spontaneous breaking of time-reversal symmetry in passive Kerr resonators, analyzing bifurcation structures and stability using theoretical models and experimental data to understand symmetry-breaking phenomena.

Contribution

It provides a detailed stability analysis of the Lugiato-Lefever model, revealing bifurcation mechanisms behind symmetry breaking in Kerr resonators, combining theoretical and experimental insights.

Findings

Symmetric states destabilize via pitchfork bifurcations at intermediate pump powers.

Periodic asymmetric solutions emerge through Hopf bifurcations at high pump powers.

Theoretical models elucidate the eigenmodes responsible for symmetry breaking.

Abstract

We study the spontaneous temporal symmetry breaking instability in a coherently-driven passive optical Kerr resonator observed experimentally by Xu and Coen in Opt.~Lett.~{\bf 39}, 3492 (2014). We perform a detailed stability analysis of the Lugiato-Lefever model for the optical Kerr resonators and analyze the temporal bifurcation structure of stationary symmetric and the emerging asymmetric states as a function of the pump power. For intermediate pump powers a pitchfork loop is responsible for the destabilization of symmetric states towards stationary asymmetric ones while at large pump powers we find the emergence of periodic asymmetric solutions via a Hopf bifurcation. From a theoretical perspective, we use local bifurcation theory in order to analyze the most unstable eigenmode of the system. We also explore a non-conservative variational approximation capturing, among others, the evolution of the solution's amplitude, width and center of mass. Both methods provide insight towards the pitchfork bifurcations associated with the symmetry breaking.