Waveguide coupling into photonic crystal waveguides
AssigneeMassachusetts Institute of Technology
InventorsSolomon Assefa, Peter Bienstman, Gale S. Petrich, Alexei A. Erchak, Steven G. Johnson, Leslie A. Kolodziejski, John D. Joannopoulos
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Abstract
A coupling element includes a first stage having a dielectric waveguide that is transitioned to a waveguide having a sequence of resonators with a fixed period. A second stage transitions the waveguide to a photonic crystal waveguide by gradually bringing closer at an angle the cladding bulk of the photonic crystal to the waveguide.
Claims35
A coupling element comprising:
- a first stage having a smooth transition from a traditional index guiding dielectric waveguide to a waveguide having a sequence of resonators with a fixed period;
- and
- a second stage that transitions said waveguide to a photonic crystal waveguide by gradually bringing closer at an angle the cladding bulk of said photonic crystal to said waveguide.
A method of forming a coupling element comprising
- providing a first stage having a smooth transition from a traditional index guiding dielectric waveguide to a waveguide having a sequence of resonators with a fixed period;
- and
- providing a second stage that transitions said waveguide to a photonic crystal waveguide by gradually bringing closer at an angle the cladding bulk of said photonic crystal to said waveguide.
A coupling element comprising:
- a first stage that transitions a photonic crystal waveguide into a waveguide having a sequence of resonators with a fixed period by gradually diverging away at an angle the cladding bulk of said photonic crystal waveguide from said waveguide;
- and
- a second stage that comprises a smooth transition from said waveguide to a dielectric waveguide.
A method of forming a coupling element comprising:
- providing a first stage that transitions a photonic crystal waveguide into a waveguide by gradually diverging away at an angle the cladding bulk of said photonic crystal waveguide from said waveguide;
- and
- providing a second stage that comprises a smooth transition from said waveguide to a dielectric waveguide.
A coupling element comprising:
- an input coupling element comprising a first stage having a first dielectric waveguide that is transitioned to a waveguide having a sequence of resonators with a fixed period and a second stage that transitions said waveguide to a photonic crystal waveguide by gradually bringing closer at an angle the cladding bulk of said photonic crystal waveguide to said waveguide;
- and
- an output coupling element comprising a third stage that transitions said photonic crystal waveguide into said waveguide by gradually diverging away at an angle the cladding bulk of said photonic crystal waveguide from said waveguide and a fourth stage that transitions said waveguide to a second dielectric element.
Dependencies are inferred from the claim text.