Embedded optical waveguide coupler
First Claim
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1. A device, comprising:
- a substrate to support a mesa;
a first waveguide formed on said mesa and having one tapered end section which adiabatically transforms an optical mode guided in said first waveguide; and
a second waveguide formed on said substrate and having a cross section larger than said first waveguide and a refractive index less than said first waveguide, said second waveguide having one waveguide section in which said first waveguide and said mesa are conformingly embedded to place said first waveguide near a center of said second waveguide.
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Abstract
Waveguide couplers to efficiently couple light from one waveguide to another with different cross sections, including but not limited to waveguides in compact integrated packages fabricated on substrates.
71 Citations
30 Claims
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1. A device, comprising:
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a substrate to support a mesa;
a first waveguide formed on said mesa and having one tapered end section which adiabatically transforms an optical mode guided in said first waveguide; and
a second waveguide formed on said substrate and having a cross section larger than said first waveguide and a refractive index less than said first waveguide, said second waveguide having one waveguide section in which said first waveguide and said mesa are conformingly embedded to place said first waveguide near a center of said second waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A device, comprising:
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a cladding layer having a mesa;
a first waveguide core, whose index is greater than said cladding layer, formed on said mesa and having a tapered end section to adiabatically transform a mode of guided light; and
a second waveguide core with a cross section greater than a cross section of and an index less than an index of said first waveguide core, said second waveguide core formed over said cladding layer and said first waveguide core to have a solid section and a hollow section, said hollow section having an opening to conformingly enclose said tapered end section and said mesa to surround said tapered end section by said mesa and said second waveguide core. - View Dependent Claims (24, 25, 26)
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27. A device, comprising:
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a first waveguide to guide an input light beam;
a substrate fabricated to comprise an input optical coupler to receive said input light beam and a second waveguide to receive light from said input optical coupler, said first waveguide coupled to said input optical coupler to direct light to said second waveguide, wherein said input optical coupler comprises;
a cladding layer having a mesa, a first waveguide core, whose index is greater than said cladding layer, formed on said mesa and having a tapered end section to adiabatically transform a mode of guided light, said first waveguide core optically coupled to said first waveguide, and a second waveguide core with a cross section greater than a cross section of and an index less than an index of said first waveguide core, said second waveguide core formed over said cladding layer and said first waveguide core to conformingly enclose said tapered end section near or at a center of said second waveguide core, said second waveguide core optically coupled to said second waveguide. - View Dependent Claims (28, 29, 30)
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Specification