Design of high quality-factor Si3N4 ridge-slot micro-ring resonator and generation of dual-comb based on orthogonally bicolor pumping
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Abstract:
A novel high quality-factor (Q) micro-ring resonator (MRR) structure based on the Si3N4 ridge-slot waveguide is proposed, and the MRR is pumped by orthogonally polarized bicolor pumping to generate dual-comb. We optimized the structure of MRR by the finite element method and precise dispersion engineering, which finally obtained the suitable MRR geometry with negative dispersion characteristics at 1550 nm, having Q of 1.7?10^7 and the absorption loss as low as 2.6?10^-5 dB/cm. The simulation model of generating dual-comb is established as coupled Lugiato-Lefever equation (LLE), which takes into account the higher order dispersion, cross-phase modulation (XPM), multiphoton absorption, and external pumping. Solved by the split-step Fourier method (SSFM) and the fourth-order Runge-Kutta (RK4) method, the numerical results show that the generated dual-comb is periodically equally spaced distribution but with slightly different intensities in the time domain. In the frequency domain, there are 64 comb teeth with intensities higher than -100 dBm with a bandwidth of 120 nm. Particularly, in the case of bicolor orthogo-nal polarization pumping, a smaller amount of detuning does not greatly affect the bandwidth of the dual-comb.
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Project Supported:
The National Natural Science Foundation of China under Grant No. 61505160, the Innovation Capability Support Program of Shaanxi (Program No. 2018KJXX-042), the Natural Science Basic Research Program of Shaanxi (Program No. 2019JM-084), the State Key Laboratory of Transient Optics and Photonics (SKLST202108), the Postgraduate Innovation and Practice Ability Development Fund of Xi’an Shiyou University (YCS22213174).
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