Patent ID: 7760974

Claim:
A silicon array waveguide grating (AWG) device comprising: a plurality of optical waveguides, each optical waveguide comprising: two linear end regions and a curve region there between; a lower cladding layer; a silicon core on the lower cladding layer wherein the silicon core has a narrower cross sectional width in the linear regions than in the curve region such that the silicon core of each optical waveguide has substantially the same and uniform cross sectional width in the linear regions and substantially the same and uniform cross sectional width in the curve region as the silicon core of every other optical waveguide of the plurality of optical waveguides; and an upper cladding layer on the silicon core, wherein the variation of the refractive index as a function of temperature (dN/dT) of the silicon core has a positive value, and the dN/dT of the upper cladding layer has a negative value which is substantially opposite to the dN/dT of the silicon core such that the dN/dT of each optical waveguide is substantially zero.