Pump condition dependent Kerr frequency comb generation in mid-infrared

We propose and simulate the mid-infrared (MIR) frequency comb generation based on the Kerr nonlinear effect in a silicon microring resonator (MRR). The MRR is formed by the suspended ridge waveguides which are designed to have the anomalous group-velocity dispersion. Taking the thermal effect into consideration, the modified Lugiato-Lefever equation (LLE) is used to simulate the frequency comb generation. The stable dissipative cavity soliton and mode-locked combs in the MIR wavelength range of 2.5 mu m-5.2 pm can be obtained under different pump conditions. It is found that the ternary-pump scheme has wider bandwidth and flatter frequency combs as compared with the dual-pump scheme. The lowest total pump power is required for the ternary-pump approach to produce the same comb span in these three pump conditions.