The effects of electrodes geometry and temperature on high frequency RF transmission characteristics are
simulated versus LiNbO3 layer thickness, inter-electrode gap, and optical waveguide parameters. On the other hand, we
focused on the optimization of the electro-optic modulator parameters where the effective index plays an essential role in
the evaluation of the bandwidth structure. Therefore, a theoretical analysis of the capacitance, the characteristic impedance
and the effective index determine how to increase the bandwidth. The study of the variation of the effective index versus
temperature shows a net drift, which affects the quality of transmission. Moreover, an approximate estimate of Sparameters
shows the sensitivity of reflection and transmission ratios upon temperature.
The interaction optical-microwave is also analyzed using Laplace equation and Finite Element Method.