Inverse Design of a Broadband and Compact Silicon Three-Mode Multiplexer for On-Chip Optical Interconnect with a 705 nm Bandwidth

We inversely design a pixelated ultra-broadband three-mode multiplexer on SOI with a record bandwidth of 705 nm. Numerical results show that loss is less than 2.03 dB over the entire wavelength range from 1458–2163 nm.