空间光通信中发射天线像差对激光传输的影响  

Influence of Transmitting Antenna's Aberration on Laser Propagation for Space Optical Communication

作　　者：向劲松[1] 潘乐春[1] 

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《半导体光电》2009年第6期913-917,共5页Semiconductor Optoelectronics

基　　金：重庆市科委自然科学基金项目(CSTC2008BB2414;KJ080513);重庆邮电大学自然科学基金项目(A2007-46)

摘　　要：空间光通信中发射天线像差会引起远场轴上光强下降。首先分析了无像差的理想发射天线,假设发射光束为高斯光束,在给定发射功率、天线直径时,天线直径与高斯光束直径的最佳比值为1.12,此时远场轴上光强最大。在此基础上分析了像差对远场轴上光强的影响,通过倾斜及离焦补偿,并减小发射光束直径可降低像差的影响。在最优条件下,1/4波长的球差、彗差及像散引起的远场轴上光强的附加损失分别为0.06 dB,0.13 dB及0.31 dB。最后分析了单透镜的像差特性,对于较大直径的发射天线,像差引起的远场轴上光强下降可达10 dB以上。Aberration of transmitting antenna will decrease the far-field on-axis intensity in space optical communication systems. Aberration-free antenna system is analyzed. By assuming transmitting beam to be Gaussian distribution, and under given optical power and diameter of transmitting antenna, it is proved that the far-field on-axis intensity reaches its maximum when the ratio of the antenna diameter to the Gaussian beam diameter is 1. 12. Compared to this maximum intensity, the far-field on-axis intensity loss induced by aberration of transmitting antenna is analyzed. This loss can be reduced by using tilt or defocus adjustment, and decreasing the diameter of transmitted Gaussian beam can also increasing the far-field on-axis intensity. Under optimal conditions, the losses caused by quarter wavelength spherical aberration, coma and astigmatism are 0. 06 dB, 0. 13 dB and 0. 31 dB respectively. Finally, the aberration characteristics of a single lens are analyzed. The decrease of on-axis intensity caused by aberration can reach 10 dB or more for transmitting antenna with a lager diameter.

关 键 词：空间光通信 发射天线 像差 

分 类 号：TN929.12[电子电信—通信与信息系统]