Integrated multistage taper coupler for waveguide to fiber coupling
First Claim
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1. A waveguide coupler for transmitting light between a silicon waveguide and an optical fiber, the coupler comprising:
- a compression region, the compression region operable to;
receive an optical beam from a semiconductor waveguide,compress the optical beam to have a smaller cross section compared to light confined in the semiconductor waveguide; and
transmit optical beam to an expansion region;
the expansion region, wherein;
the expansion region comprises a first part;
the first part overlaps, and is directly adjacent to, at least a portion of the compression region; and
the expansion region is operable to;
receive the optical beam from the compression region;
expand the optical beam to have a larger cross section compared to light confined in the semiconductor waveguide; and
transmit the optical beam to the optical fiber.
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Abstract
A waveguide coupler has a compression region and an expansion region for coupling light between a silicon waveguide and an optical fiber. The compression region receives light from the silicon waveguide and compresses an optical mode of the light. Light is transmitted from the compression region to an expansion region. The expansion region expands the light to have a larger cross section. Light is then transmitted to the optical fiber.
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Citations
19 Claims
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1. A waveguide coupler for transmitting light between a silicon waveguide and an optical fiber, the coupler comprising:
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a compression region, the compression region operable to; receive an optical beam from a semiconductor waveguide, compress the optical beam to have a smaller cross section compared to light confined in the semiconductor waveguide; and transmit optical beam to an expansion region; the expansion region, wherein; the expansion region comprises a first part; the first part overlaps, and is directly adjacent to, at least a portion of the compression region; and the expansion region is operable to; receive the optical beam from the compression region; expand the optical beam to have a larger cross section compared to light confined in the semiconductor waveguide; and transmit the optical beam to the optical fiber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An expansion region for use in a coupler for guiding light between a silicon waveguide and an optical fiber, expansion region comprising:
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a first waveguide portion having; a first part, wherein the first part is not tapered; a second part, wherein the second part is tapered to laterally expand or compress light; and a third part, wherein; the second part is disposed between the third part and the first part; and the first waveguide portion in the third part is not tapered; a second waveguide portion, wherein; the second waveguide portion extends over top of the second part and the third part; the second waveguide portion is directly adjacent to the second part and the third part of the first waveguide portion; and the second waveguide portion tapers to laterally expand or compress light. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for coupling a semiconductor waveguide to an optical fiber, the method comprising:
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transmitting a beam of light from a waveguide into an optical coupler; compressing the beam of light received from the waveguide in a first region of the optical coupler; expanding the beam of light in a second region of the optical coupler after compressing the beam of light in the first region, wherein the first region and the second region are adjacent; and transmitting the beam of light from the optical coupler to an optical fiber after expanding the beam of light in the second region of the optical coupler. - View Dependent Claims (19)
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Specification