Research and analysis on the broadband dispersion tailoring of the sub-micro silicon-on-insulator waveguides

High-order dispersions of the silicon-on-insulator (SOI) waveguides with different shapes (including slab, ridge and slot) have been obtained and compared using the finite element method (FEM). Through adjusting the geometrical parameters of the waveguides, single or dual zero-dispersion wavelengths (ZDWs) can be tuned in the broadband wavelength range. Differences of dispersion curves among these waveguides are analyzed from the viewpoint of structure and mechanism in detail. It is remarkably shown the number of ZDWs can be varied from 0 to 2 and the position of the ZDWs can be tuned from 1400 nm to 1900 nm flexibly. Moreover, the differences of dispersion features in short and long wavelength regions are also discussed deeply. Due to the dispersion of SOI waveguides playing a dominated role in many nonlinear optical effects, this research can make some contribution for dispersion tailoring and nonlinear optics.