Single-Mode Propagation and Highly Efficient Second Harmonic Generation in Periodically Poled MgO-Doped LiNbO_(3) on Insulator Rib Waveguide

Theoretical studies on mode propagation and second harmonic generation in periodically poled MgO-doped LiNbO_(3) on an insulator(PPLNOI)rib waveguide are presented.With a special design,the waveguide can simultaneously support the single-mode propagation of both a pump wave(1550 nm)and a second harmonic wave(775 nm).As a result of the strong confinement and intensive nonlinear effect in the PPLNOI rib waveguide,the calculated results indicate that a second-harmonic generation conversion efficiency of 400%W^(-1)·cm^(-2) can be achieved at a wavelength of 1550 nm,almost 2.6 times higher than the widely applied reverse proton-exchanged waveguide(150%W^(-1)·cm^(-2)).