Patent ID: 8699836
Filing Date: 2014-04-15
Classification: G02B

Abstract:
1. An optical device, comprising: a substrate having a planar surface and having an optical core thereon; a two-dimensional grating located in the optical core, said two-dimensional grating being formed by a regular two-dimensional pattern of light-refractive structures, one of said light-refractive structures being located at each node of a regular 2D lattice located in a laterally bounded region, and first and second optical waveguides located in different portions of the optical core and in a same plane as the optical core, and having ends end-coupled to the two-dimensional grating, the first optical waveguide being such that a direction of propagation through the laterally bounded region is parallel with the planar surface and near the end thereof is substantially along one of two primitive lattice vectors of said 2D lattice, the second optical waveguide being such that a direction of propagation through the laterally bounded region is parallel with the planar surface and near the end thereof is not-parallel to said primitive lattice vectors of said regular 2D lattice; and a third optical waveguide being on the planar substrate and having an end end-coupled to the two-dimensional grating, the third optical waveguide being such that a direction of propagation near the end thereof is substantially not parallel to said primitive lattice vectors of said 2D lattice.