Planar waveguides are different from photonic crystal fibres (PCFs) in that planar waveguides require high nonlinear coefficient core material for achieving the desired nonlinear effects within a short distance of propagation. The most significant advantage of planar waveguides is their capability of integration with other components to constitute a building block in integrated optical circuits. The goal of this project is to design the planar waveguides with different geometries, including rib, ridge, taper, and photonic crystals, to achieve low cost on chip nonlinear devices that are capable to perform high efficiency nonlinear processes such as optical parametric amplification, supercontinuum generation (SCG), and etc.