Passive optical diode on semiconductor substrate
AssigneePurdue Research Foundation
InventorsMinghao Qi, Li Fan, Jian Wang, Leo Tom Varghese
Life of this patent
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Abstract
A method of fabricating an optical device includes forming on a semiconductor substrate a first optical cavity, a second optical cavity, a first light guide and a second light guide. The first light guide has an input, and is optically coupled to the first optical cavity by a first coupling strength. In addition, the first light guide is optically coupled to the second optical cavity by a second coupling strength. The second light guide has an output, and is coupled to the second optical cavity by a third coupling strength. The first coupling strength is greater than the second coupling strength, and the third coupling strength is greater than the second coupling strength.
Claims20
A method of fabricating an optical device, comprising:
- forming a first optical cavity formed on a semiconductor substrate, the first optical cavity configured to store light;
- forming a second optical cavity on the semiconductor substrate, the second optical cavity configured to store light;
- forming a first light guide on the semiconductor substrate, the first light guide having an input, the first light guide optically coupled to the first optical cavity by a first coupling strength, the first light guide optically coupled to the second optical cavity by a second coupling strength;
- and
- forming a second light guide on the semiconductor substrate, the second light guide having an output, the second light guide coupled to the second optical cavity by a third coupling strength;
- wherein the first coupling strength is greater than the second coupling strength, and the third coupling strength is greater than the second coupling strength.
A method of fabricating an optical device, comprising:
- forming an optical cavity on the semiconductor substrate, the optical cavity configured to store light;
- forming on the semiconductor substrate a first light guide having an input, the first light guide optically coupled to the optical cavity by a first coupling strength, the first light guide having an input coupling;
- and
- forming on the semiconductor substrate a second light guide having an output coupling, the second light guide optically coupled to the optical cavity by a second coupling strength;
- wherein the second coupling strength is greater than the first coupling strength, and wherein the optical cavity, the first light guide and the second light guide are formed such that a first wavelength of light propagates from the input coupling to the output coupling with a first attenuation, and the first wavelength of light propagates from the output coupling to the input coupling with a second attenuation that is greater than the first attenuation.
A method of using an optical device, comprising:
- receiving an optical signal at a first light guide via a first input coupling, the first light guide coupled to an optical cavity by a first coupling strength, the optical cavity disposed on a semiconductor substrate and configured to store light;
- coupling the optical signal from first light guide to the optical cavity;
- coupled the optical signal from the optical cavity to a second light guide, the second light guide coupled to the optical cavity by a second coupling strength, the second light guide having an output coupling;
- wherein the second coupling strength is greater than the first coupling strength, and wherein the optical device is configured such that a first wavelength of light propagates from the input coupling to the output coupling with a first attention, and the first wavelength of light propagates from the output coupling to the input coupling with a second attenuation that is greater than the first attenuation.
Dependencies are inferred from the claim text.