作　　者： (林冠杰）; (朱泽林）; (蔡杨伟男）; (何书航）; (何文森）;

机构地区： 电子科技大学物理电子学院,四川成都610054

出　　处： 《激光与红外》 2017年第9期1158-1163,共6页

摘　　要： 对大气激光通信中的光传输能量损耗进行分析,着重讨论了造成接收端光功率损耗的几个主要影响因素,并做了综合性的计算机仿真,得到发射功率一定的情况下发射天线轴向偏焦和收发天线系统间横向偏移取不同量值时接收端光功率的变化。在损耗分析的基础上,文章探讨了接收端满足最低光功率条件下,偏焦和偏轴相互间的关系,提出通过调节发射天线偏焦来改善远距离接收端天线捕获的方法。在发射功率为10000 m W,距离为10 km,接收端光功率阈值为50 m W的情况下,发射天线未偏焦时收发天线系统间的允许最大偏轴量为495.9mm;当焦点偏移6.69 mm,允许最大偏轴量达到最大值为628.5 mm,与未偏焦的情况相比增加了26.74%,满足接收端光功率要求下收发天线系统间允许横向偏移区域的面积增加了60.63%,这有效地降低了大气激光通信中远距离接收端捕获的难度。 The energy loss of optical transmission in atmospheric laser communication is analyzed. The main factors af- fecting the optical power loss of the receiver are discussed emphatically, and a comprehensive simulation is done. The change of the optical power at the receiving end is obtained when the transmitting power is constant and the axial offset of the transmitting antenna and the lateral deviation of the transmitting and receiving antenna system take different val- ues. Based on the analysis of energy loss, the relationship between the offset and the off-axis was discussed under the condition that the minimum optical power requirement is satisfied at the receiver. A method of improving the antenna capture at the receiving end by adjusting the transmitting antenna bias in long-range free-space optical communication is proposed. Under the transmit power of 10000 mW,the distance of 10kin, and optical power threshold of 50 mW at the receiving end, the maximum permissible axis deviation between the transmitting and receiving antenna systems is 495.9 mm when the transmitting antenna is not defocused;when the focal shift is 6. 69 mm, the maximum deviation is 628.5 mm,which is increased by 26. 74% compared with the un-defocused condition,and the area of the lateral offset area between the receiving and receiving antenna system is increased by 60. 63% ,which effectively reduces the diffi- culty of long-range receiver-side capture.

关 键 词： 大气激光通信 能量损耗 卡塞格伦光学天线 偏焦 偏轴 捕获