大气对自由空间光通信的影响机理及改善方法

大气效应对通信链路的影响限制了自由空间光通信技术的应用,研究其影响机理和改善方法有利于降低光通信链路的误码率,提升通信速率及距离.总结了大气对自由空间光通信的影响机理,指出了不同大气效应对光通信的影响形式,其中包括光强衰减、脉冲展宽、光强起伏和闪烁、光束漂移、光束扩展、相位起伏等.综述了现有的大气影响改善方法,主要包括大孔径接收、多波长传输、多光束传输、部分相干光传输、自适应光学等技术,并简述了进一步开展工作的方向.

Mechanism and Mitigation Technology of Atmospheric Effects in Free Space Optical Communication

Atmospheric effects on links limit the application of free space optical communication technology. Researches of mechanism and mitigation technologies of atmospheric effects help to decrease the bit-errorrate (BER),enhance the data rate and available distance of optical communication.The mechanism researches of atmospheric effects on free space optical communication were briefly summarized,and the various influences of atmosphere on that were described,such as intensity attenuation,optical pulse stretch,intensity scintillation,beam wander,beam spreading and phase fluctuation,etc.The existing mitigation technologies of atmospheric effects were summarized.Some technologies were described,such as large aperture receiver, multiple wavelength propagation,multiple beam propagation,partially-coherent-beam propagation,adaptive optics,etc.Lastly,future research directions were given.