Broadband 2×2 Adiabatic 3-dB Coupler with Inversely-Tapered Mode-Evolution Region for the Silicon-on-Insulator Platform

We report a broadband 2×2 adiabatic 3-dB coupler with an inversely-tapered mode-evolution region for the silicon-on-insulator platform. Measured imbalance better than ± 0.23 dB is achieved over a 100 nm bandwidth centered at 1550 nm.