Controlled Optical signal absorber apparatus and method using quantum well layer structure
US4826295A · kind A · utility
13Cited by
5References
21Claims
0Family size
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Key dates
| Filing date | Nov 21, 1984 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Nov 21, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y20/00
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
An optical device having controllable absorption for an optical signal having a wavelength corresponding to a photon energy not exceeding 1.2 ev comprises (i) a semiconductor structure including one or more quantum well layers and (ii) means adapted for applying to the quantum well layers(s) an electric field such that the component of the field normal to the layer(s) may be controlled so as to determine the absorption edge of the quantum well layer(s) to be on either side of the optical signal wavelength. The device may be used as an optical modulator or switch and in optical demultiplexing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.