The software application by Synopsys that includes a feature/module called RSOFT_MODESYS is **RSoft Photonic Device Tools**.
**RSOFT_MODESYS** is a module within the RSoft suite that is primarily used for simulating and analyzing optical waveguide structures and photonic devices. It allows users to compute guided modes in optical waveguides, helping engineers and researchers design various optical components such as lasers, filters, and other