Intracavity Grating to Suppress Single Order of Ring Resonator
AssigneeInternational Business Machines Corporation
InventorJason S. Orcutt
Life of this patent
Estimating the term…
Abstract
Microwave-to-optical transducers in an optical ring resonator having intracavity grating to split a single resonance order are provided. In one aspect, a microwave-to-optical transducer includes: an optical ring resonator with intracavity grating; and a microwave signal waveguide optically coupled to the optical ring resonator with the intracavity grating. Microwave-to-optical transducers having multiple pump photon optical ring resonators and multiple signal photon optical ring resonators optically coupled to the optical ring resonator with the intracavity grating are also provided, as is a method of forming a microwave-to-optical transducer, and a method for microwave-optical transduction.
Claims20
A method of forming a microwave-to-optical transducer, the method comprising:
- providing a first silicon (Si) layer on a substrate;
- patterning the first Si layer to form a patterned portion of the first Si layer having a shape of an optical ring resonator on the substrate;
- depositing a silicon germanium (SiGe) layer onto the substrate over the patterned portion of the first Si layer;
- patterning the SiGe layer into a core and an evanescent feature adjacent to the core, wherein the evanescent feature comprises a base portion, and a width modulation portion having a width that modulates continuously along a surface of the base portion facing the core to form an intracavity grating;
- depositing a second Si layer onto the substrate over the core and the evanescent feature adjacent to the core;
- and
- patterning the second Si layer to form a patterned portion of the second Si layer that surrounds the core and the evanescent feature adjacent to the core.
A method for microwave-optical transduction, the method comprising:
- providing a microwave-to-optical transducer comprising an optical ring resonator with an intracavity grating, and a microwave signal waveguide for carrying microwave input photons towards the optical ring resonator with the intracavity grating;
- providing optical pump photons at a frequency fP to the optical ring resonator with the intracavity grating, wherein there are two optical resonances relative to the optical pump photon frequency (fP), and wherein the intracavity grating spoils one of the two optical resonances;
- providing microwave input photons of frequency fRF to the optical ring resonator with the intracavity grating via the microwave signal waveguide;
- and
- converting the optical pump input photons at the frequency fP to an output signal at a frequency fS, wherein fS=fP−fRF.
Dependencies are inferred from the claim text.