Patent ID: 11874488
Assignee: JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 18:
19. The diffractive optical waveguide of claim 1, wherein the coupling-out grating further comprises a third grating, the third grating comprising a plurality of third optical unit structures arranged in an array along the plane and has the first grating vector, the second grating vector, and the third grating vector;
the third optical unit structure has a third predetermined profile symmetrical with respect to an axis along the first direction when viewed in the plane; and
the first grating and the third grating are arranged side by side in the second direction so that the third straight line and the fourth straight line in the first predetermined profile of the first grating tilt towards the third grating along the first direction.