VARIATIONAL ANALYSIS OF EIGENMODES OF INTEGRATED OPTICAL WAVE-GUIDES AND APPLICATIONS

An iterative procedure is proposed for the variational analysis of Ti: LiNbO3 optical waveguides. A trial solution for the dominant electric field profile of arbitrary-order eigenmodes in strip waveguides and tw o coupled waveguides is proposed and its parameters are determined usi ng the variational method. The results calculated using this method ag ree well with those obtained using the finite-element method. The pres ent method has been used to check the accuracy of the effective index method as well as a quasi-analytical technique based on the effective index method. The results show that the effective index method is gene rally accurate for the fundamental mode and becomes less accurate for higher-order vertical modes.