FDTD Investigation of Efficient and Robust Integration Between Si3N4 and Ge-Rich GeSi for Waveguide-Integrated Electro-Absorption Optical Modulators. - Natdanai Khongpetch; Worawat Traiwattanapong; Surasak Chiangga; Pichet Limsuwan; Papichaya Chaisakul (IEEE Access, 2023)