Patent ID: 8889447
Filing Date: 2014-11-18
Classification: G02B,G02F

Abstract:
1. A method for fabricating an optical modulator device, the method comprising: forming n-type doped material layer on a substrate, a first oxide portion on a portion of the n-type doped material layer, and a second oxide portion on a second portion of the n-type doped material layer; patterning a first masking layer over the first oxide portion, portions of a planar surface of the n-type doped material layer, and portions of the second oxide portion; implanting p-type dopants in the n-type doped material layer to form a first p-type doped region and a second p-type doped region, wherein the first p-type region extends from the planar surface of the n-type doped material layer to a first depth in the n-type doped material layer, the second p-type doped region extends from a second depth in the n-type doped material layer to the substrate; removing the first masking layer; patterning a second masking layer over the first oxide portion, a portion of the first p-type doped region, and a portion of the n-type doped material layer; and implanting p-type dopants in exposed portions of the n-type doped material layer, exposed portions of the first p-type doped region, and regions of the n-type doped material layer and the second p-type doped region disposed between the substrate and the second oxide portion.