Patent ID: 7563486

Claim:
A method of fabricating a multi-layer structure, the method comprising the steps of: providing a central layer; constraining a first layer to a first side of the central layer, the first layer having a first thickness, and a first value for a thermal expansion property and a first volume associated therewith; providing an optical waveguide core formed within the first layer, the optical waveguide having a second volume associated therewith, and constraining a second layer to a second side of the central layer, the second layer having a second thickness and a second value for a thermal expansion property, the second thickness and the second value for a thermal expansion property and the first thickness and the first value for a thermal expansion property being such that, upon a change in temperature, the net change in strain energy in the first layer and the net change in strain energy in the second layer are substantially equal, wherein the thickness of the first layer is greater than 3.3 times the thickness of the second layer, and the first volume is greater than the second volume.