Thermal Behaviors and Optical Parametric Oscillation in 4H-Silicon Carbide Integrated Platforms

4H-silicon carbide (SiC) integrated platforms have shown great potential in quantum and nonlinear photonics. However, the thermal properties of 4H-SiC waveguides are still unknown, even though thermo-optic effects can play an important role in fundamental measurements and practical applications. Herein, the thermo-optic effects in a 4H-SiC microring resonator are comprehensively studied, by means of both temperature tuning and self-heating. The thermo-optic coefficient and the ratio between the thermal absorption and the thermal diffusion of 4H-SiC are quantitatively measured to be 4.21x10-5K-1 and 14.9KW-1, respectively. Considering the acquired thermal properties, Kerr-nonlinearity-based dual-pump optical parametric oscillation (OPO) is experimentally achieved, and thus, it is demonstrated that broadband solitons can feasibly be generated through thermal tuning of 4H-SiC-on-insulator (SiCOI) microring resonators.