Patent ID: 9158068
Filing Date: 2015-10-13
Classification: G02B

Abstract:
1. An arrayed waveguide grating, comprising: a first free space region and a second free space region spaced from the first free space region, the first free space region being configured to receive light having a wavelength, the second free space region having an edge portion; a first plurality of waveguides extending from the first free space region to the second free space region, each of the first plurality of waveguides having a corresponding one of a plurality of first lengths L a second plurality of waveguides extending from the first free space region to the second free space region, each of the second plurality of waveguides having a corresponding one of a plurality of second lengths L a third plurality of waveguides extending from the first free space region to the second free space region, each of the third plurality of waveguides having a corresponding one of a plurality of third lengths L wherein the first plurality of waveguides and the first and second free space regions being configured such that a first portion of the light is projected on a first part of the edge portion of the second free space region, the second plurality of waveguides and the first and second free space regions being configured such that a second portion of the light is projected onto a second part of the edge portion, and the third plurality of waveguides and the first and second free space regions being configured such that a third portion of the light is projected onto a third part of the edge portion, the first, second, and third parts of the edge portion overlapping one another, and wherein ΔL, ΔL′, and ΔL″ are not integer multiples of each other.