Integrated waveguide coupler
First Claim
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1. An integrated waveguide coupler comprising:
- a first waveguide comprising a higher refractive index portion that defines a light transmitting direction, a lower refractive index portion being disposed adjacent to the higher refractive index portion in a direction that is transverse to the light transmitting direction;
a second waveguide, comprising a III-V material and disposed near the first waveguide, the first waveguide and the second waveguide facing one another across a gap in the light transmitting direction, such that the first waveguide propagates light in the light transmitting direction, across the gap, toward the second waveguide; and
a connecting waveguide disposed in the gap between the first waveguide and the second waveguide, wherein the connecting waveguide comprises a first material, having a first index of refraction disposed substantially adjacent to the lower refractive index portion, and a second material having a second index of refraction higher than the first index of refraction and disposed substantially between the first waveguide and the second waveguides in the light transmitting direction.
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Abstract
A waveguide coupler includes a first waveguide and a second waveguide. The waveguide coupler also includes a connecting waveguide disposed between the first waveguide and the second waveguide. The connecting waveguide includes a first material having a first index of refraction and a second material having a second index of refraction higher than the first index of refraction.
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Citations
20 Claims
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1. An integrated waveguide coupler comprising:
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a first waveguide comprising a higher refractive index portion that defines a light transmitting direction, a lower refractive index portion being disposed adjacent to the higher refractive index portion in a direction that is transverse to the light transmitting direction; a second waveguide, comprising a III-V material and disposed near the first waveguide, the first waveguide and the second waveguide facing one another across a gap in the light transmitting direction, such that the first waveguide propagates light in the light transmitting direction, across the gap, toward the second waveguide; and a connecting waveguide disposed in the gap between the first waveguide and the second waveguide, wherein the connecting waveguide comprises a first material, having a first index of refraction disposed substantially adjacent to the lower refractive index portion, and a second material having a second index of refraction higher than the first index of refraction and disposed substantially between the first waveguide and the second waveguides in the light transmitting direction. - View Dependent Claims (2, 3, 4, 5)
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6. A method of fabricating a waveguide coupler, the method comprising:
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providing a substrate including a first waveguide and a second waveguide, both waveguides being operable to guide light along a light transmitting direction and spatially separated by a gap in the light transmitting direction, the gap having a bottom surface; forming a first material in the gap and adjacent to the bottom surface, wherein the first material has a first index; and forming a second material in the gap, adjacent to the first material and substantially adjacent to the first and second waveguides in the light transmitting direction, wherein the second material has an index higher than the first index. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14)
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15. An optical device comprising:
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a first waveguide region operable to support an optical mode having a peak amplitude and to propagate the optical mode in a light transmitting direction; a second waveguide region spatially separated from the first waveguide region, in the light transmitting direction, by a separation region; a multilayer waveguide region disposed in the separation region, wherein the multilayer waveguide region comprises a first material having a first index of refraction positioned below the optical mode and a second material aligned with the peak amplitude and having a second index of refraction higher than the first index of refraction. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification