Beam Splitter · 1550 nm

This 50:50 beam splitter is designed on a silicon photonics (SOI) platform with the objective of minimizing insertion loss at a 1550 nm operating wavelength. The analytic estimates indicate a transmission efficiency of 97.2%, equivalent to an insertion loss of 0.123 dB (the same transmission expressed two ways), across a 90.0 nm bandwidth. The directional-coupler geometry uses a 0.5 µm waveguide width, a 0.23 µm gap, an 18.4 µm coupling length, and a 10 µm bend radius, yielding a compact footprint of 25.5 × 1.75 µm. With a fabrication score of 94.2/100, the design appears robust and well-suited to standard SOI processes. These figures are analytic estimates rather than the result of a full physical simulation.