title: High efficiency grating coupler between silicon-on-insulator waveguides and perfectly vertical optical fibers.
abstract: A high-efficiency waveguide-to-fiber grating coupler for silicon-on-insulator waveguides was designed. Perfectly vertical fiber coupling is achieved by using an asymmetric grating structure to suppress the second-order Bragg reflection from the grating. The ability to use a perfectly vertical positioned optical fiber simplifies the packaging of the photonic integrated circuit. A coupling efficiency of 80% at a wavelength of 1.55 microm is obtained.
authors.affiliation: Photonics Research Group, Ghent University-IMEC, Ghent, Belgium. gunther.roelkens@intec.ugent.be
authors.forename: Günther
authors.initials: G
authors.lastname: Roelkens
authors.forename: Dries
authors.initials: D
authors.lastname: Van Thourhout
authors.forename: Roel
authors.initials: R
authors.lastname: Baets