| The paper designed a set of free space laser video transmission system. An 808 nm, 10mW semiconductor laser and Si-APD have been used. The system can reach a 1 kilometer communication distance.The system used a frequency division multiplexing method to achieve two-way video signals transmission. The paper designed the amplification and modulation circuit of transmitter and receiver. Through the investigation on typical optical system, the transmitting and receiving antennas have been used. Also the noise and receiver sensitivity have been analyzed and the power of the whole system has been calculated appropriately. Finally, built up the whole system and completed the system's testing in the laboratory. And also analyzed experimental results, and proposed improvement solution. |
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