We report on the new method of generating an ultra-high rate pulse train at a repetition rate of 2-THz by utilizing the combined effects of nonlinear frequency chirp and group velocity dispersion in nanoscale silicon on insulator (SOI) optical waveguides. As two optical beams modulated by the initial sinusoidal modulation elements propagate through the SOI, they are reshaped into a pulse train, in which the repetition rate can be predetermined by the modulation frequency. At the end of a 2-mm long silicon waveguide, the full width of half maximum (FWHM) of the output pulse can be compressed to about 62-fs, leading to THz pulse repetition rate.
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