Optical waveguide module

Abstract

An optical waveguide module includes a substrate, an insertion grating, a complex pupil grating, and an exit grating. The insertion grating is disposed on a first side of the substrate and has an insertion grating vector. The complex pupil grating is disposed on a second side of the substrate opposite to the first side. The exit grating is disposed on the first side of the substrate and overlaps the complex pupil grating. The exit grating has a first region, a second region, and a first dividing line separating the first region and the second region. The first dividing line extends in the direction of the insertion grating vector, and the first grating vector of the first region is different from the second grating vector of the second region.

Claims

1. An optical waveguide module, comprising: substrate; A coupling grating is disposed on the first side of the substrate and has a coupling grating vector; A compound pupil grating is disposed on a second side of the substrate opposite to the first side; and a coupling grating is disposed on the first side of the substrate and overlaps the compound pupil grating, wherein the coupling grating has a first region, a second region and a first dividing line separating the first region and the second region, the first dividing line extending in the direction of the coupling grating vector, and the first grating vector of the first region is different from the second grating vector of the second region.

2. The optical waveguide module as claimed in claim 1, wherein the coupled grating vector, the first grating vector, and the second grating vector are different from each other.

3. The optical waveguide module as claimed in claim 2, wherein the first grating vector and the second grating vector are mirror images of each other with respect to the direction of the coupled grating vector.

4. The optical waveguide module as claimed in claim 1, wherein the area ratio of the first region to the second region of the coupling grating is 7:3 to 5:

5.

5. The optical waveguide module as claimed in claim 1, wherein the complex pupil grating comprises a set of two-dimensional gratings.

6. The optical waveguide module as claimed in claim 1, wherein the complex pupil grating has a third region, a fourth region, and a second dividing line separating the third region and the fourth region, and the second dividing line extends in the direction of the coupled grating vector.

7. The optical waveguide module as claimed in claim 6, wherein the second dividing line overlaps the first dividing line.

8. The optical waveguide module as claimed in claim 6, wherein the projection distance between the first dividing line and the second dividing line on the substrate is less than 10% of the radius of the coupled beam.

9. The optical waveguide module as claimed in claim 6, wherein the third region of the complex pupil grating overlaps the first region of the coupling grating.

10. The optical waveguide module as claimed in claim 9, wherein the area of ​​the third region of the complex pupil grating is equal to the area of ​​the first region of the coupling grating.

11. The optical waveguide module as claimed in claim 9, wherein the fourth region of the complex pupil grating overlaps the second region of the coupling grating.

12. The optical waveguide module as claimed in claim 11, wherein the area of ​​the fourth region of the complex pupil grating is equal to the area of ​​the second region of the coupling grating.

13. The optical waveguide module as claimed in claim 6, wherein the coupling grating vector, the third grating vector of the third region, and the fourth grating vector of the fourth region are different from each other.

14. The optical waveguide module as claimed in claim 13, wherein the third grating vector and the fourth grating vector are mirror images of each other with respect to the direction of the coupled grating vector.

15. The optical waveguide module of claim 13, wherein the third grating vector is a mirror image of the first grating vector with respect to the extension direction of the coupling grating structure of the coupling grating.

16. The optical waveguide module of claim 15, wherein the fourth grating vector and the second grating vector are mirror images of the extension direction of the coupling grating structure of the coupling grating.

17. The optical waveguide module as claimed in claim 1, wherein the complex pupil grating does not overlap with the coupling grating.

18. The optical waveguide module as claimed in claim 1, wherein the coupling grating, the complex pupil grating and the coupling out grating each independently comprise a bulk liquid crystal grating or a nanostructure grating.

19. The optical waveguide module as claimed in claim 1, wherein the number of grating vectors in the optical waveguide module on the first side of the substrate is 3.

20. The optical waveguide module of claim 19, wherein the number of grating vectors of the optical waveguide module on the second side of the substrate is 2.

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