基于光探测器位移损伤效应的卫星光通信误码率特性研究  

Investigation on Bit Error Rate of Optical Satellite Communication Based on Displacement Damage Dose of Photodetectors

作　　者：刘韵[1] 赵尚弘[1] 杨生胜[2] 李勇军[1] 强若馨 

机构地区：[1]空军工程大学信息与导航学院,西安710077 [2]兰州空间技术物理研究所,兰州730000

出　　处：《半导体光电》2013年第6期1039-1042,1062,共5页Semiconductor Optoelectronics

摘　　要：分析了空间电离辐射的位移损伤效应影响下InGaAs PIN光探测器暗电流的损伤特性,在此基础上建立了强度调制直接检测模式的卫星光通信系统误码率模型。仿真结果表明:暗电流与辐照注量近似呈对数线性变化;误码率在辐照注量小于108 cm-2时维持在10-9之下,当辐照注量大于108 cm-2后加速上升。结合仿真结果,讨论了判决阈值对误码率的影响,得出在辐照强度为10-9 cm-2时,若判决阈值取5.7×10-7 A,则误码率降低约4个量级,较好地提高了通信质量。The damage characteristic of the dark current of InGaAs PIN photodetects was analyzed under the influence of displacement damage of space radiation,and based on which,the bit error rate model of optical satellite communication system in intensity modulation direct detection mode was established.The results show that radiation causes logarithmic linear increase in dark current.When the radiation dose is lower than 108 cm^-2,the bit error rate maintains below 10-9,and bit error rate increases accelerantly when the radiation dose is larger than 108 cm^-2.The influence of decision threshold on bit error rate is discussed,and it is concluded that when the radiation dose is 109 cm^-2,if decision threshold is 5.7×10^-7 A,the bit error rate will decrease about 4 orders of magnitude,which can improve the communication quality efficiently.

关 键 词：误码率 位移损伤效应 PIN光探测器 暗电流 判决阈值 

分 类 号：TN929.1[电子电信—通信与信息系统]