Optical coupler
First Claim
1. An optical coupler comprising an input waveguide, an intermediate waveguide, an output waveguide, a first grating situated between the input and intermediate waveguides, and a second grating situated between the intermediate and output waveguides such that, in use, light propagating in the input waveguide is coupled into the intermediate waveguide wit the assistance of the first grating, and then is coupled into the output waveguide with the assistance of the second grating, wherein the intermediate waveguide has a higher refractive index than the input waveguide and a lower refractive index than the output waveguide.
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Abstract
An optical coupler comprises an input waveguide, an intermediate waveguide, an output waveguide, a first grating situated between the input and intermediate waveguides, and a second grating situated between the intermediate and output waveguides such that, in use, light propagating in the input waveguide is coupled into the intermediate waveguide with the assistance of the first grating, and thence is coupled into the output waveguide with the assistance of the second grating. The coupler is a directional coupler, in particular a dual grating-assisted directional coupler, and may be used to couple light between an optical fibre and an integrated semiconductor device, or between dissimilar waveguides.
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Citations
20 Claims
- 1. An optical coupler comprising an input waveguide, an intermediate waveguide, an output waveguide, a first grating situated between the input and intermediate waveguides, and a second grating situated between the intermediate and output waveguides such that, in use, light propagating in the input waveguide is coupled into the intermediate waveguide wit the assistance of the first grating, and then is coupled into the output waveguide with the assistance of the second grating, wherein the intermediate waveguide has a higher refractive index than the input waveguide and a lower refractive index than the output waveguide.
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13. A coupler according to claim l2, wherein the layered structure comprises one or more layers of semiconductor material, wherein the semiconductor material comprises one or more of:
- silicon or related compounds;
gallium arsenide or related compounds;
indium phosphide or related compounds;
or lithium niobate or related compounds.
- silicon or related compounds;
Specification