Radial optical coupler
First Claim
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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.
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Abstract
An optical device includes an optical grating coupler and a plurality of optical waveguides coupled thereto. The optical grating coupler is formed along a planar surface of a substrate, and includes a pattern formed by ridges concentrically located on the surface about a center thereon. Each adjacent pair of ridges is separated by a groove. Each waveguide of the plurality of waveguides is oriented about radially with respect to the center, and has a first end that terminates near an outermost one of the ridges. The first ends are about uniformly spaced along the outermost one of the ridges.
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Citations
11 Claims
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1. An optical device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 11)
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9. An optical device, comprising:
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an optical grating coupler formed along a planar surface of a substrate, said optical grating coupler including a pattern of concentric rings of ridges located on the surface, with each adjacent pair of ridges being separated by a groove; 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 wherein said plurality of optical waveguides is configured to deliver a corresponding plurality of optical signals to said outermost ridge, with a phase of each optical signal of said corresponding plurality of optical signals increasing incrementally along said outermost ridge thereby advancing by a nonzero integer multiple of 2π
per round of said outermost ridge. - View Dependent Claims (10)
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Specification