Optical receiver and optical transmission system using the receiver
US5594577A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 21, 1995 |
| Grant date | Jan 14, 1997 |
| Priority date | — |
| Expiry date | Jun 21, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/675
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In an optical receiver of the present invention, an optical signal is split into at least two light portions, and the light portions are respectively received by at least two tunable optical filters. The tunable optical filters are respectively capable of changing their transmission wavelengths. Transmitted lights through the tunable optical filters are received by at least two light receiving elements. The light receiving elements respectively supply outputs. A differential amplifier produces a difference signal from the outputs of the light receiving elements. In an optical FDM-FSK transmission system using the optical receiver, an optical FSK signal is received by utilizing the difference signal. The tracking operation of the tunable optical filters, whose object includes, for example, at least a center optical frequency of the tunable filters, can be readily performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.