Design and Optimization of Oxide Material-Based Single-Mode Rib Waveguides for Photonic Integrated Circuits

The primary objective of this study is to design single-mode rib waveguide structures using oxide-based materials. To achieve this goal, the waveguide dimensions including width and height were optimized to ensure reliable single-mode operation. Optimization was performed using the particle swarm optimization (PSO) algorithm. The effective refractive index (n_eff), a critical parameter for waveguide design, was calculated and evaluated to confirm suitability for single-mode propagation. Additionally, the influence of various oxide materials commonly used in passive photonic components, including integrated optical waveguides, was comparatively analyzed. Simulation results provided a comparison of effective refractive indices for rib waveguides fabricated from different oxide materials. Optimal geometric parameters ensuring minimal propagation losses and maximum mode purity were identified through these simulations. Overall, this work offers a comprehensive optimization strategy for oxide-based rib waveguides, contributing valuable insights toward enhancing the performance of integrated photonic devices.