Niki Papachristou
Ansys Employee

Hi Krishnanunnira,

Thank you for reaching out. You can get the fraction of power in a given region of the waveguide cross section using the Power and impendence integration feature in the modal analysis tab of the Eigensolver analysis window after you have solved the waveguide mode. For this feature please have a look here: FDE solver analysis - Modal Analysis Tab. You can create a spatial filter which has values 1 over the core and 0 outside of the core. Once you have the spatial filter you can multiply the E intensity by the filter then integrate the result over the filter to get the power in only the core region.