Beam Splitter · 1550 nm

This beam splitter is designed on a silicon photonics (SOI) platform with the objective of minimizing insertion loss at a 1550 nm operating wavelength. The design achieves an analytically estimated efficiency of 97.2%, equivalent to an insertion loss of 0.123 dB (the same transmission expressed two ways), while providing a balanced 50:50 split ratio over a 90.0 nm bandwidth. The directional coupler geometry uses a 0.5 µm waveguide width, a 0.23 µm gap, an 18.055 µm coupling length, a 10 µm bend radius, and a 2 µm port separation, occupying a compact footprint of 25.5 × 1.75 µm. With a fabrication score of 94.2/100, the component demonstrates good manufacturability and robust performance against the minimal insertion loss constraint. These results are analytic estimates rather than the output of a physical simulation.