Channel Research Of Lazer Communication System Through Atmosphere

Atmospheric laser communication has been as a kind of verygood wireless communication means, since the laser appears, sonumerous scholars have done it with the research on the experimentand in theory. Because such a lot of factors as atmosphericscattering, refracting, turbulence, etc. in the course oftransmisting in the atmospheric laser communication system willcause the energy of laser to decay, strength of laser tofluctuate, the random deflection of the light beam, it is a keyto overcome the influence. In recent years, we have made thebrilliant achievement in atmospheric laser communicationtechnology, but it is very sensitive to atmospheric environmentalfactor. So the study on atmospheric laser communication channelseems extremely important.This paper has narrated and analyzed atmosphere decaying andatmospheric turbulence effect systematically at first, analyzedthe atmospheric turbulence effect, Then the paper provide thechannel model based on it and put forward relevant technologicalschemes against the channel, for instance, adaptive opticalsystem technology.According to the optical_detected theory, the paper hasstudied the analytical method of err under the influence of theatmosphere decays and atmospheric turbulence effect, under OOKmodulating and PPM modulating especially. The paper analyses somefactors which influence optimized optical beam disperse angle andput forward technology to improve the optical beam dispersesangle. The above-mentioned research have certain directivesignificance to the design of the communication system.