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US 7,406,224 B2Granted
Diffractive coupler optimized for alignment tolerances
AssigneeTessera North America, Inc.
InventorsJames E Morris, Michael R Feldman
Life of this patent
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Abstract
A diffractive coupler coupling light between an opto-electronic element and a waveguide minimizes variation in coupling over an offset range, while providing good coupling efficiency. The offset range may be along the optical axis and/or radial. The diffractive coupler has a long depth of field and no best focus.
Claims15
A system comprising:
- an active element;
- a waveguide;
- and
- a diffractive optical element coupling light between the active element and the waveguide, the diffractive optical element being radially symmetric, having no focal length and distributing light incident at any point thereon substantially evenly over a range of foci.
1 more element
Dependencies are inferred from the claim text.