Patent ID: 8682120
Filing Date: 2014-03-25
Classification: G02B

Abstract:
1. An optical device, comprising: a planar waveguide located on a planar substrate, the planar waveguide including a light-transmissive layer; and an optical grating coupler being located along the planar substrate and being adjacent to and optically coupled to the planar waveguide, the optical coupler including an optical grating of the light-transmissive layer, wherein: one or more slotted openings separating the optical grating into two or more grating segments that have long axes that are substantially parallel to a propagation direction of a light beam configured to pass between the planar waveguide and the optical coupler, and pitch distances between adjacent ones of the grating segments are less than a wavelength of the light beam divided by an effective refractive index of the light-transmissive layer, and wherein the wavelength of the light beam is in the C or L telecommunication band.