Modelling and beam propagation analysis of integrated electro-optic devices

Practical applications of integrated electrooptic devices such as modulators, switches, switch arrays require an optimum design of the optical waveguide and electrode configurations. The modeling and the analysis by the beam propagation method of integrated optic devices on lithiumniobate with titanium indiffused channel waveguides are presented. Electrooptic devices with channel waveguides and given electrode structures are modeled by effective two-dimensional index distributions in terms of technological parameters. Dielectric buffer layers under the electrodes are included. Switching characteristics, radiation losses, and crosstalk levels are obtained by a beam propagation analysis. Results are presented for Delta beta-reversal directional couplers, and for crossed-waveguide switches.