Spread spectrum optical communication system with heterodyne detection
US4959826A · kind A · utility
18Cited by
6References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 29, 1988 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | Feb 29, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J14/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A broad spectrum optical carrier from a source is divided over at least two paths and the carrier in at least one path is modulated in accordance with information. The paths are recombined with delay multiplexing. At a distribution point, the recombined paths are divided and the modulated carrier in at least one of the paths is combined in heterodyne detection with a local oscillator signal having a frequency shifted with respect to the carrier. The local oscillator signal is delayed prior to combination by a delay corresponding to a delay of the delay multiplexing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.