Patent ID: 6603916
Filing Date: 2003-08-05
Classification: G02B

Abstract:
A planar lightwave circuit assembly comprising:a riser having a first coefficient of thermal expansion; a substrate affixed to a first face of the riser, the substrate having a second coefficient of thermal expansion different from the first coefficient of thermal expansion; an optical layer comprising a lightwave circuit on the substrate; and, a layer of material affixed to a second face of the riser opposed to the first face, the layer of material having a third coefficient of thermal expansion different from the first coefficient of thermal expansion; wherein the second and third coefficients of thermal expansion are either both greater than the first coefficient of thermal expansion or both less than the first coefficient of thermal expansion, and the third coefficient of thermal expansion is between the first and second coefficients of thermal expansion, and the layer of material is at least one of thicker than the substrate and stiffer than the substrate.