Roelkens, GuntherGuntherRoelkensVan Thourhout, DriesDriesVan ThourhoutBaets, RoelRoelBaets2021-10-162021-10-162007-06https://imec-publications.be/handle/20.500.12860/12789High efficiency grating coupler between silicon-on-insulator waveguides and perfectly vertical optical fibersJournal article