Photodetector with segmented absorbers
AssigneeCisco Technology, Inc.
InventorsFatemeh Rezaeifar Bayat, Kam Yan Hon, Attila Mekis, Gianlorenzo Masini
Life of this patent
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Abstract
A photodetector includes a substrate, a first optical absorber, and a second optical absorber. The first optical absorber is disposed in the substrate along a direction of propagation of an optical signal through the substrate. The first optical absorber is offset in the substrate according to an offset of the optical signal in a direction orthogonal to the direction of propagation. The second optical absorber is disposed in the substrate along the direction of propagation of the optical signal. The second optical absorber is offset in the substrate according to the offset of the optical signal in the direction orthogonal to the direction of propagation.
Claims18
A photodetector comprising:
- a substrate;
- a first optical absorber disposed in the substrate along a direction of propagation of an optical signal through the substrate, wherein the first optical absorber is offset in the substrate according to an offset of the optical signal in a direction orthogonal to the direction of propagation;
- a first doped region disposed in the substrate such that the first doped region contacts the first optical absorber;
- a second doped region disposed in the substrate such that the second doped region contacts the first optical absorber, wherein the second doped region has an opposite doping relative to the first doped region, and wherein a length of the first doped region is shorter than a length of the second doped region;
- and
- a second optical absorber disposed in the substrate along the direction of propagation of the optical signal, wherein the second optical absorber is offset in the substrate according to the offset of the optical signal in the direction orthogonal to the direction of propagation.
A method comprising:
- directing an optical signal through a first optical absorber disposed in a substrate, wherein the first optical absorber is offset in the substrate according to an offset of the optical signal in a direction orthogonal to the direction of propagation, wherein a first doped region and a second doped region are disposed in the substrate such that the first doped region and the second doped region contact the first optical absorber, wherein the second doped region has an opposite doping relative to the first doped region, and wherein a length of the first doped region is shorter than a length of the second doped region;
- and
- directing the optical signal through a second optical absorber disposed in the substrate, wherein the second optical absorber is offset in the substrate according to the offset of the optical signal in the direction orthogonal to the direction of propagation.
A photodetector comprising:
- a substrate;
- a first doped region disposed in the substrate;
- a second doped region disposed in the substrate, wherein the second doped region has an opposite doping relative to the first doped region;
- a third doped region disposed in the substrate, wherein the third doped region has an opposite doping relative to the first doped region;
- a first optical absorber disposed in the substrate along a direction of propagation of an optical signal through the substrate, wherein the first optical absorber contacts the first doped region and the second doped region;
- and
- a second optical absorber disposed in the substrate along the direction of propagation of the optical signal, wherein the second optical absorber contacts the first doped region and the third doped region, wherein the first optical absorber and the second optical absorber are positioned closer to a lower end of the substrate than an upper end of the substrate opposite the lower end, and wherein the upper end and the lower end extend parallel to a direction of propagation of the optical signal.
Dependencies are inferred from the claim text.