Influences of pump power and high-order dispersion on dual-pumped silicon-on-insulator micro-ring resonator-based optical frequency combs

We numerically investigate the effects of pump power and high-order dispersion (HOD) on the generation and evolution of silicon-on-insulator (SOI) micro-ring resonator-based optical frequency combs (OFCs). The observed bandwidth and number of comb modes increase as the pump power enhances, which demonstrates the pump power as low as 0 dBm is required to initiate in the dual-pumped scheme, while the optimized pump power distribution ratio is around 0.5. The HOD can also be introduced to analyze the nonlinear symmetry breaking of the OFC, especially the sign and amplitude of the third-order dispersion determines the variation of the output OFC. Through optimizing the parameters, broadband OFC spanning nearly from 1200 nm to 2100 nm can be realized. This work could give insight for exploring detail characteristics of SOI micro-ring OFCs influenced by pump power and HOD, as well as provide a viable route to delicate control of OFC generation through dispersion adjusting.