Optical device for coupling light

Patent metadata

Field	Value
Publication number	US-11714239-B2
Application number	US-202217874228-A
Country	US
Kind code	B2
Filing date	Jul 26, 2022
Priority date	Feb 22, 2021
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

An optical device for coupling light propagating between a waveguide and an optical transmission component is provided. The optical device includes a taper portion and a grating portion. The taper portion is disposed between the grating portion and the waveguide. The grating portion includes rows of grating patterns. A first size of a first grating pattern in a first row of grating patterns is larger than a second size of a second grating pattern in a second row of grating patterns. A first distance between the first row of grating patterns and the waveguide is less than a second distance between the second row of grating patterns and the waveguide.

First claim

What is claimed is:

1. An optical device for coupling light propagating between a waveguide and an optical transmission component, the optical device comprising:
a taper portion; and
a grating portion, the taper portion being disposed between the grating portion and the waveguide, and the grating portion comprising rows of trapezoid-shaped grating patterns spaced apart from one another.

2. The optical device as claimed in claim 1 , wherein one row of trapezoid-shaped grating patterns among the rows of trapezoid-shaped grating patterns are arranged along an arc path.

3. The optical device as claimed in claim 1 , wherein the rows of trapezoid-shaped grating patterns comprise a first row of trapezoid-shaped grating patterns and a second row of trapezoid-shaped grating patterns located between the first row of trapezoid-shaped grating patterns and the waveguide.

4. The optical device as claimed in claim 3 , wherein the trapezoid-shaped grating patterns in the first row of trapezoid-shaped grating patterns are of a same first size, and the trapezoid-shaped grating patterns in the second row of trapezoid-shaped grating patterns are of a same second size.

5. The optical device as claimed in claim 4 , wherein the first size is smaller than the second size.

6. The optical device as claimed in claim 3 , wherein a pitch between the trapezoid-shaped grating patterns in the first row of trapezoid-shaped grating patterns is constant.

7. The optical device as claimed in claim 3 , wherein a first pitch between the trapezoid-shaped grating patterns in the first row of trapezoid-shaped grating patterns is greater than a second pitch between the trapezoid-shaped grating patterns in the second row of trapezoid-shaped grating patterns.

8. The optical device as claimed in claim 1 , wherein the grating portion further comprises rows of modulating patterns disposed between the taper portion and the rows of trapezoid-shaped grating patterns.

9. An optical device, comprising:
a waveguide,
a grating portion, the grating portion comprising first rows of trapezoid-shaped grating patterns and second rows of trapezoid-shaped grating patterns, a first interval between the first rows of trapezoid-shaped grating patterns is different from a second interval between the second rows of trapezoid-shaped grating patterns, wherein the trapezoid-shaped grating patterns in one of the first rows of trapezoid-shaped grating patterns are arranged along an arc path.

10. The optical device as claimed in claim 9 , wherein the optical device further comprises a taper portion disposed between the grating portion and the waveguide, wherein a first edge of the taper portion connects to the waveguide.

11. The optical device as claimed in claim 10 , wherein the taper portion has a second edge opposite to the first edge, and the second edge is an arc-shaped edge.

12. The optical device as claimed in claim 9 , wherein the second rows of trapezoid-shaped grating patterns are located between the first rows of trapezoid-shaped grating patterns and the waveguide.

13. A device for receiving light from or outputting light to an optical fiber, the device comprising:
a light-guiding material layer, having an upper surface facing the optical fiber, the light-guiding material layer comprising:
a waveguide, wherein an end portion of the waveguide is arranged along a first direction, and
a grating coupler, comprising:
a first portion, optically coupled to the end portion of the waveguide;
a second portion, optically coupled to the first portion and the optical fiber, and the second portion comprising rows of trapezoid-shaped grating patterns; and
a filling element, filled in gaps between the grating patterns, wherein the rows of trapezoid-shaped grating patterns are arranged along arc paths.

14. The device as claimed in claim 13 , wherein the rows of trapezoid-shaped grating patterns comprise a first row of trapezoid-shaped grating patterns arranged along a first arc path and a second row of trapezoid-shaped grating patterns arranged along a second arc path.

15. The device as claimed in claim 14 , wherein a first interval between the first row of trapezoid-shaped grating patterns is different from a second interval between the second row of trapezoid-shaped grating patterns.

16. The device as claimed in claim 13 , wherein the refractive index of the filling element is smaller than the refractive index of the light-guiding material layer.

17. The device as claimed in claim 13 , wherein the second portion further comprises modulating patterns disposed between the first portion and the rows of trapezoid-shaped grating patterns.

18. The device as claimed in claim 13 , wherein the second portion further comprises a first modulating structure and a second modulating structure disposed between the first portion and the rows of trapezoid-shaped grating patterns, the first modulating structure comprises a first row of modulating patterns, and the second modulating structure comprises a second row of modulating patterns, and a third size of a first modulating pattern in the first row of modulating patterns is smaller than a fourth size of a second modulating pattern in the second row of modulating patterns, wherein a third distance between the first modulating structure and the end portion of the waveguide is less than a fourth distance between the second modulating structure and the end portion of the waveguide.

19. The device as claimed in claim 18 , wherein the filling element fills in gaps between the modulating patterns.

20. The device as claimed in claim 19 , wherein a third ratio of a sum of projection areas of the modulating patterns on the upper surface to a projection area of the filling element on the upper surface of the first modulating structure is smaller than a fourth ratio of a sum of projection areas of the modulating patterns on the upper surface to a projection area of the filling element on the upper surface of the second modulating structure.

Assignees

• Taiwan Semiconductor Mfg Co Ltd

Inventors

• Chern Chan-Hong
• Lin Chih-Chang
• Jou Chewn-Pu
• Shih Chih-Tsung
• Kuo Feng-Wei
• Cho Lan-Chou
• Hsu Min-Hsiang
• Song Weiwei

Classifications

• G02B6/305 Primary

  and having an integrated mode-size expanding section, e.g. tapered waveguide · CPC title

• G02B6/124 Primary

  Geodesic lenses or integrated gratings · CPC title

• G02B6/30

  for use between fibre and thin-film device · CPC title

• G02B6/29317

  Light guides of the optical fibre type · CPC title