Optical coupler including a Faraday rotator layer and at least one grating coupler
US11668884B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 2021 |
| Grant date | Jun 6, 2023 |
| Priority date | — |
| Expiry date | Aug 12, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical coupling device can couple incident light from a fiber into waveguides, but can reduce the coupling of return light from the waveguides into the fiber. A Faraday rotator layer can rotate by forty-five degrees, with a first handedness, respective planes of polarization of incident beams, and can rotate by forty-five degrees, with a second handedness opposite the first handedness, respective planes of polarization of return beams. A redirection layer can include at least one grating coupler that can redirect an incident beam of one polarization so that the redirected path extends within the redirection layer toward a first waveguide, and can redirect an incident beam of an opposite polarization so that the redirected path extends within the redirection layer toward a second waveguide. An optional birefringent layer can spatially separate incident beam having different polarizations, so that two single-polarization grating couplers can be used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.