Patent ID: 7160746
Filing Date: 2007-01-09
Classification: C23C,G02B

Abstract:
1. A method of depositing a top clad layer for an optical waveguide of a planer lightwave circuit, the method comprising the steps of: a) providing a flow rate for a Ge dopant gas for a SiO b) providing a flow rate for a P dopant gas for the top clad layer deposition; c) providing a flow rate for a B dopant gas for the top clad layer deposition; and d) controlling the flow rates for the Ge dopant gas, P dopant gas and B dopant gas to form the top clad layer, and wherein controlling the flow rates reduces crystallization areas within the top clad layer and wherein the top clad layer comprises refractive index stability across an anneal temperature range from 900° C. to 1050° C.