2000 character limit reached
Frequency combs in a microring optical parametric oscillator (1908.04688v1)
Published 13 Aug 2019 in physics.optics
Abstract: We report the soliton frequency comb generation in microring optical parametric oscillators operating in the down-conversion regime and with the simultaneous presence of the $\chi{(2)}$ and Kerr nonlinearities. The combs are studied considering a typical geometry of a bulk LiNbO$_3$ toroidal resonator with the normal group velocity dispersion spanning an interval between the pump and the down-converted signal. We have identified critical power signaling a transition between the relatively low pump power predominantly $\chi{(2)}$ combs and the high pump power ones shaped by the competition between the $\chi{(2)}$ and Kerr nonlinearities.