摘要
光束发散角和接收口径是大气激光通信机设计的主要参数。根据高斯光束的光强分布特性,分析激光大气通信中主要的几何扩展损耗,并提出了基于该损耗的光端机设计新方法。通过对几何扩展损耗与发散角、接收口径的相互关系数值分析,确定出适合于数公里级大气激光通信机的主要参数:光束发散角可取0.8mrad～1.2mrad,接收口径为120mm。研制了155Mbps,4km大气激光通信机,初步实验结果表明在能见度大于4km的情况下,系统性能满足误码率低于10-9要求。
Beam divergent angle and receiving aperture are the key parameters of tree space opucal （FSO） communication equipment. It is assumed that optical beam obeys Gaussian profile. Through analyzing the geometrical spreading loss that is the main power loss in FSO system, a new design method based on the power loss for FSO communication equipment is proposed. According tO relations of beam divergence, receiver aperture and geometrical spreading loss, the beam divergent angle and receiving aperture should be 0.8～1.2mrad and 120mm respectively, especially for several kilometers link. A set of 155Mbps, 4km FSO communication equipment is developed and its initial experiment results show that the bit error rate is less than 10^-9 when visibility is more than 4km.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2005年第11期84-86,共3页
Opto-Electronic Engineering
关键词
大气激光通信
几何扩展损耗
发散角
接收口径
Atmospheric laser communication
Geometrical spreading loss
Divergent angles
Receiver aperture
