Thi Thanh, T. T.; Trung, H. N.; Nguyen, T. H.; Cao, D. T. 3D-BPM Simulation Design of a Compact 3-DB Optical Power Splitter Using a 2 × 2 RI-MMI Coupler on Silicon Waveguide. Opto-Electron. Rev. 2026, 33, e155674 .