hi sahil singh,
there is the provision to chnage materials properties in the optifiber.The “Material Properties” allows the user to specify the Sellmeier and nonlinear coefficients of the fiber material. It also displays the material refr. index as a function of wavelength. For the dispersion model it is assumed that the fiber profile consists of regions with only the host material and doped regions. One of the dopants rises the refractive index, while the other dopant lowers it
the sellmier equation is most widely accepted equation for evaluating the material dispersion in the optical materials
with regards