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A semi-analytic technique to determine the propagation constant of periodically segmented Ti:LiNbO3 waveguide

Pranabendu Ganguly

A semi-analytical technique to determine the propagation constant of periodically segmented Ti:LiNbO3 waveguide (PSW) is described. The 2-D refractive index profiles of the waveguide segments are computed from its fabrication parameters, such as, Ti-layer thickness and width, and the diffusion parameters. WKB method is used to transform 2-D refractive index profile to 1- D lateral effective index profile, which is then converted to equivalent refractive index profile of the PSW. Finally transfer matrix method is applied to compute the propagation constant of the waveguide.