US 10,948,657 B2Granted

Bichromatic chip to free-space grating coupler

AssigneeHoneywell International Inc.

InventorsMatthew Wade Puckett, Chad Hoyt, Chad Fertig

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Abstract

A bichromatic grating coupler comprises a two-dimensional diffraction grating structure, including a first sub-grating having a first periodic structure and a second sub-grating having a second periodic structure. The first and second sub-gratings are superimposed with respect to each other in the diffraction grating structure. A first optical port is coupled to the diffraction grating structure along a first direction, and a second optical port is coupled to the diffraction grating structure along a second direction. The first optical port is configured to direct a first light beam having a first wavelength to the diffraction grating structure, such that the first light beam is diffracted in a first direction by the first sub-grating. The second optical port is configured to direct a second light beam having a second wavelength to the diffraction grating structure, such that the second light beam is diffracted in a second direction by the second sub-grating.

Claims13

Dependent claims

A bichromatic grating coupler, comprising:

a waveguide core layer;
a diffraction grating structure on a surface of the waveguide core layer, the diffraction grating structure comprising:
a first sub-grating having a first periodic structure in the diffraction grating structure;
and
a second sub-grating having a second periodic structure in the diffraction grating structure;
wherein the first sub-grating and the second subgrating are superimposed with respect to each other in the diffraction grating structure;
a first optical port coupled to the diffraction grating structure along a first direction;
and
a second optical port coupled to the diffraction grating structure along a second direction that is different than the first direction;
wherein the first optical port is configured to direct a first light beam having a first wavelength to the diffraction grating structure, such that the first light beam is diffracted at a first emission angle by the first sub-grating;
wherein the second optical port is configured to direct a second light beam having a second wavelength to the diffraction grating structure, such that the second light beam is diffracted at a second emission angle by the second sub-grating.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/530,595Filed 2 Aug 2019
Published: US 2021/0033794 A14 Feb 2021
Granted: 16 Mar 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G02B 6/12007
Of the integrated circuit kind: forming wavelength selective elements, e.g. multiplexer, demultiplexer
G02B 6/29329
Of the slab or planar or plate like form, i.e. confinement in a single transverse dimension only: diffractive elements operating in transmission
G02B 6/124
Basic optical elements, e.g. light-guiding paths: geodesic lenses or integrated gratings
G02B 6/136
Integrated optical circuits characterised by the manufacturing method: by etching