Signal processing scheme for reducing atmospheric modulation noise in optical communication
Abstract
A simple signal processing technique useful in recovering a demodulated polarization modulation audio signal from atmospheric modulation noise is demonstrated. Negligible depolarization effects engendered by atmospheric propagation are used to advantage such that optical polarization modulation can be employed in transmission of audio information without serious interference by atmospheric modulation noise. Beam steering or beam deflection, beam spread, fluctuations in beam arrival angle, and beam scintillation contribute to atmospheric modulation noise impairing the performance of optical heterodyne receivers and throwing He-Ne laser beams off target. The dual-path signal processing scheme minimizes these effects.
- Publication:
-
IEEE Proceedings
- Pub Date:
- July 1976
- Bibcode:
- 1976IEEEP..64.1116L
- Keywords:
-
- Atmospherics;
- Light Modulation;
- Noise Reduction;
- Optical Communication;
- Optical Polarization;
- Signal Processing;
- Atmospheric Optics;
- Optical Depolarization;
- Optical Heterodyning;
- Photodiodes;
- Transmission Efficiency;
- Communications and Radar