The software application by Synopsys that includes a feature/module called RSOFT_FEMSIM is **Optical Solutions**, specifically the **RSoft Design Suite**.
**RSOFT_FEMSIM** is a module within the RSoft Design Suite that focuses on Finite Element Method (FEM) simulations for optical devices. It provides tools for designing and modeling photonic devices using FEM, enabling users to analyze and predict the behavior of light in various structures.