Patent ID: 8027556
Filing Date: 2011-09-27
Classification: B82Y,G02B

Abstract:
1. A coupling structure of waveguides to couple a line-defect waveguide in which light is guided along a line defect of a pillar photonic crystal and a wire waveguide in which light is guided along a thin wire, said coupling structure of the waveguides comprising: a line-defect waveguide portion configured to include said line defect waveguide; an electromagnetic-field-distribution-matching-portion configured to be connected to said line-defect waveguide portion and a first taper portion; the first taper portion configured to be connected to said electromagnetic-field-distribution-matching portion; and a wire waveguide portion configured to be connected to said first taper portion and have said wire waveguide, wherein said electromagnetic-field-distribution matching-portion includes: a matching portion line defect as the line defect of the pillar photonic crystal, wherein said matching portion line defect is connected to said line-defect waveguide, wherein said first taper portion includes: a first thin wire core, and a first line defect of the pillar photonic crystal arranged along at least one side of said first thin wire core, wherein said at least one of said first thin wire core and said first line defect is connected to said matching portion line defect, wherein said wire waveguide is connected to said first thin wire core.