Abstract
Femtosecond wavelength conversion in the telecommunication bands via four-wave mixing in a long silicon rib waveguide is theoretically investigated. Compared with picosecond pulses, the spectra are greatly broadened for the femtosecond pulses due to self-phase modulation and cross-phase modulation in the four-wave mixing process, and it is difficult to achieve a wavelength converter when the pump and signal pulse widths are close to or less than in the telecommunication bands because of the spectral overlap. The influence of the spectral broadening on the conversion efficiency is also investigated. The conversion bandwidth of and peak conversion efficiency of are demonstrated by using pulses with higher efficiency than the picosecond pulse-pumped efficiency when the repetition rate is .
© 2011 Optical Society of America
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