Polarization splitting grating couplers
AssigneeLuxtera, Inc.
InventorsLawrence C. Gunn, III, Thierry J. Pinguet, Maxime J. Rattier, Jeremy Witzens
Life of this patent
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Abstract
A polarization splitting grating coupler (PSGC) connects an optical signal from an optical element, such as a fiber, to an optoelectronic integrated circuit. The PSGC separates a received optical signal into two orthogonal polarizations and directs the two polarizations to separate waveguides on an integrated circuit. Each of the two separated polarizations can then be processed, as needed for a particular application, by the integrated circuit. A PSGC can also operate in the reverse direction, and couple two optical signals from an integrated circuit to two respective orthogonal polarizations of one optical output signal sent off chip to an optical fiber.
Claims25
An optical apparatus disposed on a substrate, comprising:
- first and second ports,
- a non-planar port, and
- a cross grating comprising a first waveguide grating superimposed on a second waveguide grating, said cross grating comprising a plurality of light scattering elements arranged in a plurality of curved rows,
- where the first and second ports are in the plane of the substrate and are non-parallel to each other, and the non-planar port is not in the plane of the substrate.
An optical apparatus disposed on a substrate, comprising:
- first and second ports, wherein the first and second ports are in the plane of the substrate and are non-parallel to each other;
- a non-planar port, wherein the non-planar port is not in the plane of the substrate;
- and
- a plurality of light scattering elements arranged in a plurality of curved rows, wherein first and second pluralities of curved lines define positions for at least some of the plurality of light scattering elements and, wherein each of the first plurality of curved lines is comprised of a respective one of a plurality of substantially concentric homothetic elliptical curves defined by a first pair of foci, and each of the second plurality of curved lines is comprised of a respective one of a plurality of substantially concentric homothetic elliptical curves defined by a second pair of foci.
Dependencies are inferred from the claim text.