Back to results
US 8,278,728 B2Granted
Array of concentric CMOS photodiodes for detection and de-multiplexing of spatially modulated optical channels
AssigneeFlorida Institute of Technology
InventorSyed Murshid
Life of this patent
Estimating the term…
Abstract
An octagonal structure of photodiodes using standard CMOS technology has been developed to serve as a de-multiplexer for spatially multiplexed fiber optic communication systems.
Claims16
A plurality of concentric photodiodes for the detection of spatially multiplexed annular or circular light beams comprising,
- a plurality of alternate annular or circular semiconductor materials arranged in a concentric array of alternate P semiconductor materials and N semiconductor materials;
- said plurality of P concentric semiconductor materials including a contact with an alternate concentric N semiconductor material in separate photodiode P-N junctions, arranged in said concentric array to produce separate electrical signals in response to separate annular or circular light beams incident on said separate photodiode P-N junctions;
- said separate photodiode P-N junctions including separate terminals adapted for connection to an electrical source adapted for applying a bias to said separate P-N junctions;
- and
- wherein said N semiconductor material in said photodiode P-N junctions include separate N-wells in said P semiconductor material.
2 more elements
A plurality of concentric photodiodes for the detection of spatially multiplexed annular or circular light beams, comprising,
- means for producing separate respective signals in response for separate respective annular or circular light projections;
- means to minimize the cross influence of said separate respective signals, produced in response to said separate respective annular or circular light projections.
A plurality of concentric photodiodes for the detection of spatially multiplexed annular or circular light beams comprising,
- a plurality of alternate annular or circular semiconductor materials arranged in a concentric array of alternate P semiconductor materials and N semiconductor materials;
- said plurality of P concentric semiconductor materials including a contact with an alternate concentric N semiconductor material in separate photodiode P-N junctions;
- said separate photodiode P-N junctions arranged in said concentric array to produce separate electrical signals in response to separate annular or circular light beams incident on said separate photodiode P-N junctions;
- said separate photodiode P-N junctions including separate terminals adapted for connection to an electrical source adapted for applying a bias to said separate P-N junctions;
- and
- including separate well junctions in said P semiconductor material or said N semiconductor material;
- and
- wherein said separate well junctions isolate the cross influence of said separate electrical signals in said separate photodiode P-N junctions.
5 more elements
Dependencies are inferred from the claim text.