Compact Adiabatic Taper for SOI Waveguide

In this paper, we present a novel design of an adiabatic compact taper which can be used as a converter between a grating coupler and a single-mode optical fiber at 1550 nm wavelength. The proposed taper in this paper is coupling the light between a wide grating coupler with width 15µ and nanophotonic waveguide with width 500nm. Besides, the length of the proposed design is 22µm. Therefore, it is a compact design as it has a small footprint which leads to high efficiency and low costs in fabrication. The coupling efficiency is around 92%.