Polarization-independent grating optical coupler
First Claim
1. An optical device, comprising:
- a planar waveguide located on a planar substrate, the planar waveguide including a light-transmissive layer; and
an optical grating coupler being located along the planar substrate and being adjacent to and optically coupled to the planar waveguide, the optical coupler including an optical grating of the light-transmissive layer, wherein;
one or more slotted openings separating the optical grating into two or more grating segments that have long axes that are substantially parallel to a propagation direction of a light beam configured to pass between the planar waveguide and the optical coupler, and pitch distances between adjacent ones of the grating segments are less than a wavelength of the light beam divided by an effective refractive index of the light-transmissive layer, andwherein the wavelength of the light beam is in the C or L telecommunication band.
11 Assignments
0 Petitions
Accused Products
Abstract
An optical device comprising a planar waveguide located on a planar substrate, the planar waveguide including a light-transmissive layer and an optical grating coupler being located along the planar substrate and being adjacent to and optically coupled to the planar waveguide. The optical coupler includes an optical grating of the light-transmissive layer. The optical grating includes a periodic arrangement of light-refractive structures and one or more slotted openings separating the optical grating into two or more grating segments that have long axes that are substantially parallel to a propagation direction of a light beam configured to pass between the planar waveguide and the optical coupler. Pitch distances between adjacent ones of the grating segments are less than a wavelength of the light beam divided by an effective refractive index of the light-transmissive layer.
38 Citations
22 Claims
-
1. An optical device, comprising:
-
a planar waveguide located on a planar substrate, the planar waveguide including a light-transmissive layer; and an optical grating coupler being located along the planar substrate and being adjacent to and optically coupled to the planar waveguide, the optical coupler including an optical grating of the light-transmissive layer, wherein; one or more slotted openings separating the optical grating into two or more grating segments that have long axes that are substantially parallel to a propagation direction of a light beam configured to pass between the planar waveguide and the optical coupler, and pitch distances between adjacent ones of the grating segments are less than a wavelength of the light beam divided by an effective refractive index of the light-transmissive layer, and wherein the wavelength of the light beam is in the C or L telecommunication band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of using an optical device, comprising:
-
transmitting a light beam through an optical coupler, including; directing the light beam through an optical grating in a light-transmissive layer, the transverse electric and transverse magnetic modes of the light beam being directed at a substantially same angle that is substantially normal to a planar substrate that the light-transmissive layer is located on, wherein the optical grating includes; a periodic arrangement of light-refractive structures, one or more slotted openings separating the optical grating into two or more grating segments that that have long axes that are substantially parallel to a propagation direction of the light beam configured to pass between the optical coupler and a planar waveguide located on the planar substrate, and pitch distances between adjacent ones of the grating segments are less than a wavelength of the light beam divided by an effective refractive index of the light-transmissive layer, and wherein the wavelength of the light beam is in the C or L telecommunication band. - View Dependent Claims (17, 18)
-
-
19. A method of manufacturing an optical device, comprising:
-
fabricating an optical coupler on a planar substrate, including; forming an optical grating, including;
forming a light-transmissive layer on the planar substrate; andpatterning the light-transmissive layer to form a periodic arrangement of light-refractive structures and to form one or more slotted openings separating the optical grating into two or more grating segments having long axes that are substantially parallel to a propagation direction of the light beam configured to pass between the optical coupler and a planar waveguide located on the planar substrate, wherein pitch distances between adjacent ones of the grating segments are less than a wavelength of the light beam divided by an effective refractive index of the light-transmissive layer, and wherein the wavelength of the light beam is in the C or L telecommunication band. - View Dependent Claims (20, 21, 22)
-
Specification