南京邮电大学通信与信息工程学院, 江苏 南京 210003:
为改善自由空间光通信(FSO)系统中传统判决门限技术的不足,降低连续波参照光辅助检测技术中参考光不携带任何信息给系统带来的高成本损耗, 提出了一种基于已判决信号的量化电压获得当前码元判决门限的自适应判决门限技术(ADT),提取信号中的直流分量(DC)作为连续波参考光来估计大气湍流信道的 波动特性。结果表明在误码率为10－3的条件下,自适应判决门限和直流提取技术具有更低的功率损耗,可显著提高FSO通信系统的性能。
自由空间光通信 闪烁效应 自适应判决门限 直流分量 连续波参考光 free-space optical communications scintillation effect adaptive decision threshold direct current component continuous wave reference light
Author Affiliations
Abstract
中国科学院上海光学精密机械研究所高功率激光物理联合实验室，上海201800
Beam automatic alibnment system is used to implement beam adjustment .Basing on the principle of matrix optic，the mathematical model for auto-alignment in four-pass amplifier is built by analyzing the properties of this system. Using this model, the shems of beam alignment is designed and the analytical solutions of the amounts of near field adjustment and far field adjustment are obtained, respectively.
激光技术 光束准直 四程放大 laser technique beam alignment four-pass amplifier Collection Of theses on high power laser and plasma physics
2008, 6(1): 117
