Hello,

I would like to simulate the modes of a graded-index fiber and I was wondering how I can define a material with an inhomogeneous refractive index. I know that through material dispersion I can define a dispersive material but I could not find a way to make such dispersion like the one for graded-index fiber(radial change of the refractive index), as the refractive index profile is shown in the attached image. Can you help me with that? Can it be designed in a way to be parametrized?

Thanks for your help,

Shima

Edu CST Studio​​​​​​​​​​​​​​