Modeling and Analysis of Linbo3 Optical Modulator with Superconducting Electrodes

A full wave analysis of a LiNbO3 optical modulator with superconductor electrodes is presented. The analysis is based on the method of transverse resonance. An equivalent circuit of the travelling wave superconductor coplanar line is described. Generalized trial quantities are introduced as virtual adjustable sources in the equivalent network representation of boundary conditions. It is shown that equivalent network including the two port and generalized trial quantities is more powerful than the usual surface impedance approximation. The design and performance of a LiNbO3 optical modulator have been investigated. Numerical calculations of the attenuation constants of superconducting transmission lines indicate that the performance of the optical modulator can be much superior to that using normal metals, with respect the band width/driving voltage.