Compact polarization-independent quasi-adiabatic 2x2 3 dB coupler on silicon

We demonstrate a quasi-adiabatic polarization-independent 2x2 3 dB coupler based on the silicon-on-insulator platform. Using a quasi-adiabatic taper design for the mode evolution/coupling region, the TE mode evolution is accelerated, and the TM mode coupling is achieved at a short coupling length. The measured working bandwidth is 75 nm with a compact mode evolution/coupling region of 11.7 mu m. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

In this study, a quasi-adiabatic polarization-independent 2x2 3 dB coupler based on the silicon-on-insulator platform is demonstrated. The TE mode evolution is accelerated and the TM mode coupling is achieved at a short coupling length using a quasi-adiabatic taper design. The coupler exhibits a wide working bandwidth and a compact size.