Three-dimensional (3D) photonic chip-to-fiber interposer
First Claim
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1. A method of fabricating an optical coupling device, comprising:
- forming a waveguide mask layer on a surface of a substrate platform, the waveguide mask layer comprising an array of openings including a first end and a second end opposite to the first end, the forming the waveguide mask layer comprising tapering down a first width of each of the openings from the first end to the second end;
immersing the substrate platform into a salt melt comprising ions to form an array of waveguides in the substrate platform through an ion diffusion process, the array of waveguides corresponding to the array of openings; and
controlling a rate of the immersing such that a diffusion depth of the ions varies as a function of a distance in a direction from the first end to the second end, the array of waveguides extending in the direction from the first end to the second end, the controlling the rate of immersing comprising;
exposing the first end to the ions for a longer duration than the second end to cause a height of the array of waveguides to taper down in a direction from the first end to the second end, the tapered down first width of each of the openings causing a second width of a respective one of the waveguides to taper down in the direction from the first end to the second end.
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Abstract
A method of fabricating an optical coupling device, comprising forming a waveguide mask layer on a substrate platform, wherein the waveguide mask layer comprises an array of openings comprising a first end and a second end opposite to the first end, immersing the substrate platform into a salt melt comprising ions to form an array of waveguides in the substrate platform through an ion diffusion process, and controlling a rate of immersion such that a diffusion depth of the ions varies as a function of a distance in a direction from the first end to the second end, wherein the array of waveguides extends in the direction from the first end to the second end.
29 Citations
20 Claims
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1. A method of fabricating an optical coupling device, comprising:
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forming a waveguide mask layer on a surface of a substrate platform, the waveguide mask layer comprising an array of openings including a first end and a second end opposite to the first end, the forming the waveguide mask layer comprising tapering down a first width of each of the openings from the first end to the second end; immersing the substrate platform into a salt melt comprising ions to form an array of waveguides in the substrate platform through an ion diffusion process, the array of waveguides corresponding to the array of openings; and controlling a rate of the immersing such that a diffusion depth of the ions varies as a function of a distance in a direction from the first end to the second end, the array of waveguides extending in the direction from the first end to the second end, the controlling the rate of immersing comprising; exposing the first end to the ions for a longer duration than the second end to cause a height of the array of waveguides to taper down in a direction from the first end to the second end, the tapered down first width of each of the openings causing a second width of a respective one of the waveguides to taper down in the direction from the first end to the second end. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of fabricating an optical coupling device, the method comprising:
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forming a waveguide mask layer on a first surface of a substrate platform, the substrate platform comprising a second surface adjacent to the first surface, a third surface adjacent to the first surface, and opposite to and parallel with the second surface, and a fourth surface adjacent to the second and third surfaces and opposite the first surface, the waveguide mask layer comprising an array of openings extending across the first surface of the substrate platform from the second surface of the substrate platform to the third surface of the substrate platform; and forming an array of waveguides in the substrate platform corresponding to the array of openings in the waveguide mask layer, the array of waveguides comprising ion channels formed using only a single masking process and extending from the second surface of the substrate platform to the third surface of the substrate platform; the array of waveguides formed with an array pitch with a large pitch end at the second surface of the substrate platform and a small pitch end at the third surface of the substrate platform; and each of the waveguides formed with a truncated cone-shaped structure that tapers down parallel to and perpendicular to the first surface from the large pitch end to the small pitch end. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification