The SOI platform is a cornerstone of modern photonics, enabling dense integration of modulators, detectors, lasers, quantum emitters, and passive components for applications ranging from interconnects to quantum information science and optical computation. This application note demonstrates a simulation of an SOI-based optical modulator using a mixed-level solution that combines RSoft Photonic Device Tools and Sentaurus TCAD. Silicon-on-Insulator (SOI) modulators are complex devices that require accurate modeling of electronic, process and optical. In operation, the primary benefits of the silicon ring modulator, also referred to as a micro-ring modulator (MRM) due to the devices' small scale, are its small footprint, low power consumption, and narrow wavelength selectivity. The challenges of silicon MRMs stems from silicon's third order. SOI integrated photonic chips are platforms built on a silicon device layer with a buried oxide for high-index optical confinement and electrical isolation. They encode an electrical waveform onto an optical carrier. However, their performance is often limited by inherent electro-optic processes and imperfections in existing integrated designs, which limit their.