Patent ID: 9494735
Filing Date: 2016-11-15
CPC Classification: G02B,H04J

Claim Text:
1. Arrayed waveguide grating apparatus comprising an input free-space region, an output free-space region, and an array of waveguides from the input free-space region to the output free-space region, the output free space region having a far boundary disposed across the output free space region from the array, wherein the input free-space region has an input port comprising at least first and second inputs, the first input being for carrying optical energy according to a first channel plan identifying a first center frequency and a first plurality of wavelength channels with a first constant channel spacing, and the second input being for carrying optical energy according to a second channel plan identifying a second center frequency and a second plurality of wavelength channels with a second constant channel spacing, the first and second center frequencies being different, wherein the first input is disposed such that optical energy according to the first channel plan provided on the first input will, using a first order M and wherein the second input is disposed such that optical energy according to the second channel plan provided on the second input will, using a second order M