Costas loop experiments for a 10.6 micron communications receiver
Abstract
The principle of the Costas-type nonlinear phase-locked loop is transferred to the 10.6 micron wavelength of CO2 lasers. The experimental setup is described, emphasizing the peculiarities of optical Costas loops, and the measured characteristic loop parameters are presented. Results are given of a successful demonstration of carrier regeneration and coherent demodulation of binary phase-shift-keyed double-sideband suppressed-carrier input signals. It is shown that the optical Costas loop has the ability to regenerate the carrier of a binary phase-shift-keyed input signal and to perform coherent demodulation at a data rate of 20 Mbit/s. It is concluded that Costas loop communication receivers are feasible for the infrared and that optical fiber communications around 1 micron wavelength will profit from phase-locked loop coherent detection.
- Publication:
-
IEEE Transactions on Communications
- Pub Date:
- August 1983
- Bibcode:
- 1983ITCom..31.1000P
- Keywords:
-
- Infrared Lasers;
- Optical Communication;
- Phase Locked Systems;
- Phase Shift Keying;
- Signal Reception;
- Carbon Dioxide Lasers;
- Carrier Frequencies;
- Phase Lock Demodulators;
- Satellite-To-Satellite Tracking;
- Spacecraft Communication;
- Transmission Efficiency;
- Communications and Radar