WAVEGUIDE TRANSITION STRUCTURE AND FABRICATION METHOD
First Claim
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1. A waveguide transition structure, comprising:
- a first waveguide comprising a first waveguide top plain on an first level, wherein the first waveguide top plain has a width X;
a second waveguide comprising a second waveguide top plain on a second level adjacent to the first waveguide top plain, wherein the first and second waveguides overlap in a waveguide overlap area; and
wherein the first waveguide top plain comprises;
a first taper across the waveguide overlap area, wherein the first taper reduces the width X to zero; and
a second taper across the waveguide overlap area disposed on a side of the first waveguide adjacent to the first top plain, wherein the second taper forms a surface that gradually transitions the first top plain on the first level to the second top plain on the second level.
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Abstract
Some embodiments of the present disclosure describe a tapered waveguide and a method of making the tapered waveguide, wherein the tapered waveguide comprises a first and a second waveguide, wherein the first and second waveguides overlap in a waveguide overlap area. The first and second waveguides have a different size in at least one dimension perpendicular to an intended direction of propagation of electromagnetic radiation through the tapered waveguide. Across the waveguide overlap area, one of the waveguides gradually transitions or tapers into the other.
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Citations
26 Claims
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1. A waveguide transition structure, comprising:
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a first waveguide comprising a first waveguide top plain on an first level, wherein the first waveguide top plain has a width X; a second waveguide comprising a second waveguide top plain on a second level adjacent to the first waveguide top plain, wherein the first and second waveguides overlap in a waveguide overlap area; and wherein the first waveguide top plain comprises; a first taper across the waveguide overlap area, wherein the first taper reduces the width X to zero; and a second taper across the waveguide overlap area disposed on a side of the first waveguide adjacent to the first top plain, wherein the second taper forms a surface that gradually transitions the first top plain on the first level to the second top plain on the second level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 26)
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9. A method of fabricating a waveguide transition structure, comprising:
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removing a patterned oxidized volume from an epitaxial film to leave an elevated structure on the epitaxial film, wherein the elevated structure tapers from a first width to zero across a waveguide overlap area, wherein the first width is equal to or greater than a width X; applying a mask to a band along a surface of the epitaxial film, wherein the band along the surface of the epitaxial film comprises a portion of the elevated structure above the waveguide overlap area; etching the surface of the epitaxial film to remove a volume of the epitaxial film not protected by the mask; removing the mask to leave a first waveguide comprising a first waveguide top plain with the width X and a second waveguide comprising a second waveguide top plain on a second level below the first waveguide top plain;
whereinthe first and second waveguides overlap in the waveguide overlap area and wherein the first waveguide top plain comprises;
a first taper across the waveguide overlap area, wherein the first taper reduces the width X to zero; and
a second taper across the waveguide overlap area disposed on a side of the first waveguide adjacent to the first top plain, wherein the second taper forms a surface that gradually transitions the first top plain on the first level to the second top plain on the second level. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An optical system comprising:
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a waveguide transition structure, wherein the waveguide transition structure comprises a first waveguide and a second waveguide; a first transmitter or receiver of electromagnetic radiation optically coupled to the first waveguide and a second transmitter or receiver of electromagnetic radiation optically coupled to the second waveguide; wherein the first waveguide comprises a first waveguide top plain on an first level, wherein the first waveguide top plain has a width X; the second waveguide comprising a second waveguide top plain on a second level adjacent to the first waveguide top plain;
wherein,the first and second waveguides overlap in a waveguide overlap area; and wherein the first waveguide top plain comprises; a first taper across the waveguide overlap area, wherein the first taper reduces the width X to zero; and a second taper across the waveguide overlap area disposed on a side of the first waveguide adjacent to the first top plain, wherein the second taper forms a surface that gradually transitions the first top plain on the first level to the second top plain on the second level. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification