Patent ID: 8815704
Filing Date: 2014-08-26
Classification: G02B,H01L

Abstract:
1. A method of forming an integrated structure, the method comprising: forming an etch mask material over a semiconductor substrate; using a single reticle in a photolithographic process to pattern the etch mask material to define a first and a second opening for forming a first and a second trench isolation area, the second opening being wider than the first opening; etching first and second trench isolation areas in the semiconductor substrate using the patterned etch mask material; processing the etched first and second trench isolation areas to produce first and second trench isolation areas, filled with a dielectric material, the second dielectric filled trench isolation area being deeper than the dielectric filled first trench isolation area; forming a photonic device over the dielectric filled second trench isolation area such that the photonic device is optically isolated from the substrate.