Wavelength demultiplexing multiple quantum well photodetector
US5949561A · kind A · utility
3Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1997 |
| Grant date | Sep 7, 1999 |
| Priority date | — |
| Expiry date | Apr 15, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F77/146
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
A wavelength demultiplexer having at least two photodetectors is disclosed. The photodetectors are arranged in sequential layers along an optical path. The photodetectors differ in bandgap, and are arranged so that the optical signal passes through relatively larger bandgap photodetectors before being received by relatively smaller bandgap detectors. Each photodetector absorbs photons within a predetermined energy range and generates a voltage as a function of the absorbed energy. The photodetectors can be used to detect, and hence demultiplex, a wavelength-division-multiplexed signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.