The Research On High Power And High Speed Transmitter Of The Free Space Laser Communication

With the developments of science and technology, a new focus on using high frequency laser to communicate on space satellite becomes more and more important in modern times. Although the spatial laser communication has not been implemented truly until now, the question of the feasibility of the laser spatial communication has been already tested, worried about the key technologies such as small power of laser, the low receiving sensitivity, the high requests of APT, the higher request about quantity of heat and the stability of mechanical originally make obvious process in recent years. High-power and high-speed transmission system of the laser communication is an important part of the spatial laser communication system, and the DFB-LD and EDFA is the most important part in the transmission system of the laser communication.This paper simply introduces the transmission system between the satellite and the airplane. Compared three ways of spatial laser communication transmission, and find the best way which is adapt to the 1550nm wave band communications. Then focus on the EDFA, and the condition in this system which must suit for each part of components are researched and analysed, and the scheme is designed. Also introduce the PPM code modulation.According to the EDFA emulation in the free space laser communication,the results indicate that the pump power and the output signal power close to linetype, Cascaded EDFAs can aggrandizement the signal power to what the SPLC request,and the system can satisfy the the expected functions,and optimize the EDFA configuration can reduce the BER, which is capable of the high quality laser communication...