We propose a horizontal double-slot silicon waveguide to achieve flattened and low dispersion from -26 ps/(km . nm) to 21 ps/(km . nm) over an 878 nm wavelength range, which is much larger than that obtained from a single-slot waveguide. The mechanism of using this double-slot structure to increase the bandwidth is studied. Our study shows that the mode transition process from one strip mode to two slot modes helps extend the bandwidth of the flattened and low dispersion to longer wavelengths compared with a single-slot waveguide. Furthermore, we show by simulation the supercontinuum generation with a 3 dB bandwidth of 188 nm in an all-normal-dispersion profile with an input pulse of 50 fs. (C) 2014 Optical Society of America.
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