【作者】 余向东； 沈常宇； 王育红；

【机构】 中国计量学院光电子技术研究所；

【摘要】 本文介绍了光波在大气传播中产生衰减的原因以及对自由空间光通信 (FSO)的影响。由于天气状况的变动性和不可控制性,使得大气衰减对自由空间光通信(FSO)产生重要影响,并限制了它的使用。毫米波因受大气衰减的影响相对要小得多,因此,采用毫米波和FSO的混合系统可有效降低大气衰减的影响, 大大提高系统的可靠性,可获得大于1km的载波级传输距离,是解决“最后一公里”问题的良好手段。更多还原

【Abstract】 In this paper, the atmosphere attenuation for optical wave and the effect of it on free space optical communication ( FSO ) is introduced. Because weather condition is changeable and could not be controlled, the effect of atmosphere attenuation on free space optical communication is significant and the capacity of FSO is limited. The atmosphere attenuation for millimeter wave is very lower than optical wave, so the mixed system consisted of millimeter wave technology and FSO can reduce effect of atmosphere attenuation availably and improve reliability greatly. The carrier grade distance of the mixed system is greater than 1 km, so it can be a good solution for the " last kilometer".更多还原