Demonstration and Fabrication Tolerance Study of a Low-Loss, Ultra-broadband Rapid Adiabatic 3-dB Coupler in a Next-Generation 45 nm Monolithic Electronic-Photonic Platform. - Josep M. Fargas Cabanillas; Derek M. Kita; Anatol Khilo; Forrest Sedgwick; John Michael Fini; Milos A. Popovic; Mark T. Wade (OFC, 2021)