Influence Analysis of Thermo-Optic Effect on Generation and Evolution of Silicon-on-Insulator Microcavity Optical Comb

Microcavity optical frequency combs exhibit low power consumption, integration, and tunable comb spacing, and they have been widely used in many fields. The technology for processing silicon-on-insulator (SOI) materials is compatible with the existing complementary metal-oxide-semiconductor (CMOS) process, making it one of the most promising photonic platforms. In this study, a silicon-based micro-ring resonator with a ridge section was designed, and the effects of various geometric parameters on the dispersion of the micro-ring resonator were investigated. The thermal dynamic equation of the micro-ring resonator was numerically solved, and the effects of different parameters on the thermal dynamic influence of the micro-ring resonator were analyzed. The Lugiato-Lefever equation (LLE) model was solved numerically. Because the thermo-optic effect was ignored in the theoretical research on SOI microcavity optical frequency comb, the influence of the thermo-optic effect on the generation and evolution of the optical frequency comb was analyzed. The numerical results show that at 0. 0. 16 degrees C, the maximum power of the light field increases by 22% in the time domain, and the optical frequency comb broadens by 221 nm in the frequency domain. Finally, the output spectrum of the optical frequency comb under two kinds of thermo-optic effects was analyzed. The results show that the bandwidth of the optical frequency comb is expanded by 353 nm compared with that at 0.0. 16 degrees C when the temperature range of the thermo-optic effect is 0. 0. 32 degrees C.