Single-waveguide integrated wavelength demux photodetector and method of making it
US6731850B1 · kind B1 · utility
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23References
19Claims
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Key dates
| Filing date | Nov 16, 2001 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Nov 16, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/509
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photodetector has a spatially varying absorption spectrum formed in a monolithic InGaAsP structure whose quantum well active structure has modified effective bandgap properties. A waveguide couples light to the quantum well active structure. The spatially varying absorption spectrum allows wavelength-division demultiplexing. The effective bandgap properties can be modified by rapid thermal annealing to cause the diffusion of defects from one or two InP defect layers into the quantum well active structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.