Switching device for optical beams and telephone exchange incorporating such a device
US4403352A · kind A · utility
9Cited by
2References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1981 |
| Grant date | Sep 6, 1983 |
| Priority date | — |
| Expiry date | Dec 2, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q3/526
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A Switch is disclosed which makes it possible to optically connect at least one of the circuits of a group of input circuits to at least one circuit of a group of output circuits. A photosensitive medium is illuminated by parallel beams from a matrix of input circuits which beams are then defracted on layers written in the medium and then reach one of the circuits of the matrix of photoreceiver circuits. The layers are written by interference of two beams whose wavelengths differ from that of input beams with the wavelength of the input beams being out of the spectral sensitivity range of the photosensitive medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.