High efficiency grating coupler between silicon-on-insulator waveguides and perfectly vertical optical fibers.
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.
Roelkens
Günther
G
Photonics Research Group, Ghent University-IMEC, Ghent, Belgium. gunther.roelkens@intec.ugent.be
Van Thourhout
Dries
D
Baets
Roel
R