Optical heterodyne receiver with phase or frequency lock
US3975628A · kind A · utility
58Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1975 |
| Grant date | Aug 17, 1976 |
| Priority date | — |
| Expiry date | Apr 2, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/64
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An improved optical heterodyne receiver is disclosed. Novel control circuitry is utilized in the receiver to provide compensation and tracking for undesired phase and frequency excursions of both the received and the local oscillator signals. An optical heterodyne receiver such as that disclosed is especially useful in optical communications systems having wideband variations in the frequency of the received signal caused by Doppler shifts and angle-modulated noise components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.