THEORETICAL-ANALYSIS OF GUIDED MODE AND EFFECTIVE REFRACTIVE-INDEX AT1.53 MU-M IN TI-LINBO3 STRIP WAVE-GUIDES

An analysis of guided modes and effective refractive indexes in c-cut Ti-diffused LiNbO3 strip waveguides has been performed at the waveleng th 1.53 mu m by the variational method, Dependences of mode size and e ffective refractive index on initial Ti-strip width W, diffusion tempe rature T and initial Ti-strip thickness Ii have been calculated for se veral lower order modes, As compared the plots of the mode size with t he previous published experimental results, an agreement in general be havior has been obtained, The single-mode and cutoff conditions were d iscussed numerically, which are very useful in optimizing and designin g the Er:Ti:LiNbO3 waveguide devices. In addition, several advantages of 1.48 mu m pumping were summarized.