Carrier and clock recovery for lightwave systems
US5546190A · kind A · utility
Inventors
Key dates
| Filing date | Sep 9, 1992 |
| Grant date | Aug 13, 1996 |
| Priority date | — |
| Expiry date | Sep 9, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/64
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical communication system includes a transmitter for generating a subcarrier multiplexed optical signal from a pilot tone, a receiver and an optical fiber for coupling the optical signal from the transmitter to the receiver. At the transmitter, an optical carrier is modulated with a composite modulation signal including a plurality of modulated microwave subcarriers to provide the optical signal and pilot tone for carrier and clock recovery. The receiver includes a local oscillator for generating a local light beam, a detector responsive to the received optical signal and the local light beam for providing a detected signal at an intermediate frequency, and a microwave receiver for receiving the detected pilot tone for simultaneously generating the subcarrier frequencies for demodulating the microwave subcarriers from the detected signal, an automatic frequency control signal for controlling the local oscillator, and the clock signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.