Hi moataz,
To better understand the scope of your question and your project goal, can you identify what parameters are you interested in particular. In general, Lith. Niob. mach-zehnder modulator operation (based on electro-optical principle) determined by following parameters: ordinary refractive index, uniaxial Pockels coefficients (based on chosen direction of propagation: logitudinal or transverse), aspect ratio (ratio of its width to its length), half-wave voltage and operational wavelength. In accordance with your design goals, you can set up certain parameters and others can be directly calculated…