Patent ID: 9162404
Filing Date: 2015-10-20
Classification: B29D,G02B,G11B

Abstract:
1. An optical device, comprising: an optical grating coupler formed along a planar surface of a substrate, said grating coupler including a pattern of concentric rings of ridges located on the surface, with each adjacent pair of the ridges being separated by a groove; and a plurality of optical waveguides having first ends that terminate at an outermost one of the ridges, the first ends being about uniformly spaced along said outermost one of the ridges and being oriented radially with respect to a center of said concentric rings; and a plurality of optical transition portions, each transition portion partially filling a region between adjacent ones of the first ends of the waveguides, wherein each of said transition portions includes a first subportion having a first thickness and a second subportion having a second thickness that is less than said first thickness.