Abstract

Femtosecond wavelength conversion in the telecommunication bands via four-wave mixing in a 1.5mm 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 100fs 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 220nm and peak conversion efficiency of 8dB are demonstrated by using 500fs pulses with higher efficiency than the picosecond pulse-pumped efficiency when the repetition rate is 100GHz.

© 2011 Optical Society of America

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