Research on Coherent Receiving Technology of Free Space Optical Communication
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Free Space Optical Communication Generally Refers to Long-Distance Optical Wireless Communication with Laser as Carrier and Atmosphere as Transmission Medium, Which is Commonly Used in Satellite Communication, Uav Communication, Emergency Communication and Other Applications. Compared with Radio Frequency Communication, It Has the Advantages of High Bandwidth, Strong Confidentiality, Low Deployment Cost, No Spectrum License Plate and So on. However, the Propagation of Laser in the Atmosphere is Easily Affected by Atmospheric Turbulence and Weather Conditions, Resulting in the Power Fading and Signal Distortion of the Received Signal, Which Makes the Communication Performance of the System Decline. in Order to Resist This Kind of Interference, on the One Hand, the Redundancy and Reliability of Communication Can Be Improved by Coding and Other Technologies, on the Other Hand, the Receiver Sensitivity Can Be Improved. in This Paper, the Free Space Communication Channel Model is Summarized Based on the Atmospheric Turbulence. Aiming At the High-Speed and High-Sensitivity Receiver, the Coherent Receiver Based on Digital Signal Processing Technology, the Coherent Receiver Based on Single Photodetector and the Multi Aperture Receiver Are Discussed and Experimented One after Another.
Free Space Optical Communication; Coherent Receiver; Research