Fig. 1. Schematic diagram of ridge-shaped micro-ring resonator. (a) Section diagram, where W is ridge width, h is outer ridge height, and H is inner ridge height; (b) three-dimensional schematic diagram

Fig. 2. Distribution of TE mode light field at 1550 nm in cross section of ridge-shaped micro-ring resonator

Fig. 3. Influence of various parameters on second-order dispersion of ridge-shaped micro-ring resonator. (a) Influence of different ridge widths W on second-order dispersion when outer ridge height is 2 μm and inner ridge height is 3.5 μm; (b) influence of different outer ridge heights h on second-order dispersion when ridge width is 4 μm and inner ridge height is 3.5 μm; (c) influence of different inner ridge heights H on second-order dispersion when outer ridge height is 2 μm and ridge width is 4 μm

Fig. 4. Temperature variation diagram of micro-ring resonator with time

Fig. 5. Influence of different parameters on thermal dynamic effect of micro-ring resonator. (a) Influence of different quality factors Q on thermal dynamic effect of micro-ring resonator; (b) influence of different pump power P on thermal dynamic effect of micro-ring resonator

Fig. 6. Time-domain evolution diagrams of optical field with and without considering thermo-optic effect. (a) Time-domain evolution of optical field cycling 10000 times without considering thermo-optic effect in simulation; (b) time-domain evolution of optical field cycling 10000 times with considering thermo-optic effect; (c) time-domain evolution of optical field cycling 50000 times without considering thermo-optic effect; (d) time-domain evolution of optical field cycling 50000 times with considering thermo-optic effect

Fig. 7. Frequency-domain evolution diagrams of optical frequency comb with and without considering thermo-optic effect. (a) Frequency-domain evolution of optical frequency comb with 10000 cycles without considering thermo-optic effect; (b) Frequency-domain evolution of optical frequency comb with 10000 cycles with considering thermo-optic effect; (c) Frequency-domain evolution of optical frequency comb with 50000 cycles without considering thermo-optic effect; (d) Frequency-domain evolution of optical frequency comb with 50000 cycles with considering thermo-optic effect

Fig. 8. Spectrum comparison diagram of optical frequency comb after 50000 cycles of light field in two cases. Thick line is case without considering thermo-optic effect, and thin line is case with considering thermo-optic effect

Fig. 9. Spectrum of optical frequency comb under two kinds of thermo-optic effect. Thin line indicates temperature range is 0‒0.32 ℃, and thick line indicates temperature range is 0‒0.16 °C

Table 1. Relevant parameters of micro-ring resonator