Frequency combs in a microring optical parametric oscillator

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.

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• Bright-soliton frequency combs and dressed states in chi(2) microresonators
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• An ultra-stable microresonator-based electro-optic dual frequency comb
• Sech-squared Pockels solitons in the microresonator parametric down-conversion
• Mid-infrared frequency combs and staggered spectral patterns in ${\chi }^{(2)}$ microresonators
• Two-color flat-top solitonic pulses in ${\chi }^{(2)}$ optical microresonators via second harmonic generation
• Two-color flat-top solitons in microresonator-based optical parametric oscillators
• Ladder of Eckhaus instabilities and parametric conversion in chi(2) microresonators
• Bistable soliton optical frequency combs in a second harmonic generation Kerr cavity
• Dual backgrounds and their stability during ${\chi }^{(2)}$ comb generation in microresonators
• Walk-off induced dissipative breathers and dissipative breather gas in microresonators