Numerical investigation of dual‐pumped optical frequency combs based on silicon‐on‐insulator microring resonator

Abstract

AbstractDual‐pumped optical frequency combs (OFCs) based on silicon‐on‐insulator (SOI) microring and their characteristics are numerically investigated. This indicates that a relative low pump power is required to generate the comb modes effectively due to the high Q factor and large nonlinearity of the SOI microring. The number of generated comb modes reaches to 28, and the spacing of comb modes is over 300 nm. As the pump power enhances to 12 dBm, the bandwidth of the OFCs (over 800 nm) and the number of the comb modes (over 64) ranged from the infrared to mid‐infrared wavelength region. Correspondingly, the field profile of the OFCs changes to irregular shape when the pump power increases. Meanwhile, it has been found that the intensity of the pedestal of the OFC is above −150 dBm when the Gaussian noise is introduced, which reduced the bandwidth and modes of the OFCs by affecting the pump powers' transferring efficiency. The OFCs based on SOI microring can be found applications in chip‐scale oscillations, waveform generation, and ultrafast spectroscopy.