Patent ID: 6760498
Filing Date: 2004-07-06
Classification: B82Y,G02B,G02F,H01L

Abstract:
An arrayed waveguide grating (AWG) deposited on a wafer that includes an upper semiconductor layer, comprising:a gate oxide layer deposited above the upper semiconductor layer, and a polysilicon layer formed at least in part from polysilicon deposited above the gate oxide layer; a first port, a plurality of second ports, and a plurality of arrayed waveguides extending between the first port and each one of the plurality of second ports, each one of the plurality of arrayed waveguides at least partially formed by the upper semiconductor layer, the polysilicon layer, and the gate oxide layer, each of the arrayed waveguides being associated with a portion of the polysilicon layer, each portion of the polysilicon layer having a different cross-sectional area, wherein each of the arrayed waveguides has a different effective mode index, and wherein a value and a position of the effective mode index associated with each of the respective arrayed waveguides remains substantially unchanged over time and applies a substantially unchanging optical function to light travelling through the respective arrayed waveguide over the lifetime of the respective arrayed waveguide.