Efficient Conversion to Very High Order Modes in Silicon Waveguides

摘要

We demonstrate robust mode conversion up to the 12^th higher order mode in silicon waveguides by using an optimized adiabatic directional coupler and using subwavelength waveguides. The conversion efficiency is better than -1.5 dB over a 75 nm bandwidth and tolerating ±30 nm fabrication variations. © 2019 The Author(s).