Single Soliton Microcomb Based on High-Q On-Chip Si3N4 Optical Microresonators
High-quality(high-Q)on-chip microresonators have been shown to be a promising platform for Kerr soliton frequency comb generation.Si3N4 microresonators composed of multimode waveguides can achieve high-Q factors and anomalous dispersion,which are necessary for soliton generation.To further reduce the threshold power for generating a single-soliton microcomb,a novel racetrack Si3N4 microresonator with Euler bends has been reported that achieves loaded Q factors greater than 5X106.Compared with conventional circular bends,the sudden change in the bending radius at the waveguide connection is significantly suppressed,which in turn suppresses mode interaction and reduces propagation loss.With this novel microresonator,single-soliton frequency combs with a repetition rate in the microwave Ka band and a bandwidth exceeding 20 nm(corresponding to a pulse duration of 129 fs)are generated using only a 47 mW pump laser(33 mW estimated on-chip pump power)under the auxiliary laser heating method.
optical microcavitysingle-soliton frequency combEuler bendsfemtosecond pulse
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