Waveguide-to-waveguide couplers with multiple tapers
First Claim
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1. A structure for a waveguide-to-waveguide coupler, the structure comprising:
- a first waveguide taper;
a first waveguide coupled to the first waveguide taper, the first waveguide and the first waveguide taper having a first arrangement in which the first waveguide terminates the first arrangement;
a second waveguide taper; and
a second waveguide coupled to the second waveguide taper, the second waveguide and the second waveguide taper having a second arrangement in which the second waveguide terminates the second arrangement,wherein the first waveguide and the first waveguide taper are comprised of silicon, the second waveguide and the second waveguide taper are comprised of silicon nitride, the second waveguide is arranged in a vertical direction directly and primarily over the first waveguide taper, and the second waveguide taper is arranged in the vertical direction directly and primarily over the first waveguide.
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Abstract
Waveguide-to-waveguide couplers, systems that include waveguide-to-waveguide couplers, and methods of fabricating waveguide-to-waveguide couplers. A first waveguide is coupled to a first waveguide taper, and a second waveguide is coupled to a second waveguide taper. The first waveguide and the first waveguide taper are comprised of silicon, and the second waveguide and the second waveguide taper are comprised of silicon nitride. The second waveguide and the second waveguide taper are arranged in a vertical direction over the first waveguide and the first waveguide taper.
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Citations
19 Claims
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1. A structure for a waveguide-to-waveguide coupler, the structure comprising:
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a first waveguide taper; a first waveguide coupled to the first waveguide taper, the first waveguide and the first waveguide taper having a first arrangement in which the first waveguide terminates the first arrangement; a second waveguide taper; and a second waveguide coupled to the second waveguide taper, the second waveguide and the second waveguide taper having a second arrangement in which the second waveguide terminates the second arrangement, wherein the first waveguide and the first waveguide taper are comprised of silicon, the second waveguide and the second waveguide taper are comprised of silicon nitride, the second waveguide is arranged in a vertical direction directly and primarily over the first waveguide taper, and the second waveguide taper is arranged in the vertical direction directly and primarily over the first waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 17)
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10. A system comprising:
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an input grating coupler; a first plurality of optical components comprised of silicon nitride; a second plurality of optical components comprised of silicon nitride; a multimode interference splitter arranged to couple with the input grating coupler with the first plurality of optical components and with the second plurality of optical components; and a first waveguide-to-waveguide coupler arranged in a first optical path between the input grating coupler and the multimode interference splitter or in a second optical path that includes the first plurality of optical components, the first waveguide-to-waveguide coupler including a first waveguide taper, a first waveguide coupled to the first waveguide taper, a second waveguide, and a second waveguide taper coupled to the second waveguide, the first waveguide and the first waveguide taper of the first waveguide-to-waveguide coupler comprised of single-crystal silicon, the first waveguide and the first waveguide taper of the first waveguide-to-waveguide coupler having a first arrangement in which the first waveguide terminates the first arrangement, the second waveguide and the second waveguide taper of the first waveguide-to-waveguide coupler having a second arrangement in which the second waveguide terminates the second arrangement, the second waveguide and the second waveguide taper of the first waveguide-to-waveguide coupler comprised of silicon nitride, the second waveguide of the first waveguide-to-waveguide coupler arranged in a vertical direction directly and primarily over the first waveguide taper of the first waveguide-to-waveguide coupler, and the second waveguide taper of the first waveguide-to-waveguide coupler arranged in the vertical direction directly and primarily over the first waveguide of the first waveguide-to-waveguide coupler. - View Dependent Claims (11, 12, 13, 14, 18)
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15. A method of forming a waveguide-to-waveguide coupler, the method comprising:
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patterning a semiconductor layer to form a first waveguide taper and a first waveguide coupled to the first waveguide taper; depositing a dielectric layer over the first waveguide taper and the first waveguide; and patterning the dielectric layer to form a second waveguide taper and a second waveguide coupled to the second waveguide taper, wherein the first waveguide and the first waveguide taper have a first arrangement in which the first waveguide terminates the first arrangement, the second waveguide and the second waveguide taper have a second arrangement in which the second waveguide terminates the second arrangement the semiconductor layer is comprised of silicon, the dielectric layer is comprised of silicon nitride, the second waveguide is arranged in a vertical direction directly and primarily over the first waveguide taper, and the second waveguide taper is arranged in the vertical direction directly and primarily over the first waveguide. - View Dependent Claims (16, 19)
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Specification