4-Dimensional Symmetry Breaking of Light in Kerr Ring Resonators

Symmetry breaking of light states is of interest for the understanding of nonlinear optics, photonic circuits, telecom applications and optical pulse generation. Here we demonstrate 4-fold symmetry breaking of the resonances of ring resonators with Kerr nonlinearity. This symmetry breaking naturally occurs in a resonator with bidirectionally propagating light with orthogonal polarization components. The four circulating field components are shown to exhibit multiple and, nested and isolated, spontaneous symmetry breaking bifurcations, and are also capable of complex oscillatory dynamics - such as four-field self-switching, and unusual temporal cavity soliton-like dynamics on time scales of multiple round-trip times, with extended delays between subsequent generations.