空间激光通信系统光电器件辐射效应研究  

The effect of radiation on the optoelectronic devices used in space laser communication system

作　　者：杨生胜[1] 高欣[2] 冯展祖[2] 王俊[1] 把得东[1] 曹洲[1] YANG Shengsheng;GAO Xin;FENG Zhanzu;WANG Jun;BA Dedong;CAO Zhou(Science and Technology on Vacuum Technology and Physics Laboratory, Lanzhou Institute of Physics,Lanzhou 730010, China;Science and Technology on Material Performance Evaluating in Space Environment Laboratory, Lanzhou Institute of Physics,Lanzhou 730010, China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室 [2]兰州空间技术物理研究所空间材料行为及评价技术重点实验室,兰州730010

出　　处：《航天器环境工程》2017年第6期571-576,共6页Spacecraft Environment Engineering

基　　金：国家自然科学基金项目(编号:11475078;11375078)

摘　　要：针对空间激光通信系统所用高速半导体激光器、光电探测器、掺铒光纤放大器(EDFA)、石英光纤等关键器件,开展电子、质子和γ射线辐照试验。半导体激光器经^(60)Co-γ射线和电子加速器辐照后斜率效率发生轻微下降,下降程度与总剂量大小有关;而光功率在电子辐照后出现严重下降,表明电子辐照比γ射线产生更多的损伤,可以归因于电子造成的位移损伤。PIN光电探测器在质子辐照后,暗电流和电容都明显增大,主要是由于质子造成的位移损伤引入深能级缺陷增加势垒,导致光电探测器性能退化。EDFA系统的掺铒光纤经^(60)Co-γ射线辐照后,对系统的增益和噪声影响很大。石英光纤主要受总剂量效应影响,辐射损耗随光纤通入的光波波长增大而减小,而且光纤损耗的剂量率效应不明显,实际试验可以根据试验条件选择适当的剂量率。研究结果可为空间激光通信系统的元器件选型、辐射效应评估与抗辐射加固设计提供参考数据。The irradiation tests by electron,proton and60Co-γsources are completed for the laser diodes,PIN photo detector,erbium-doped fiber amplifier(EDFA),and silica fiber used in space laser communication systems.The slope efficiency of laser diodes is slightly decreased after irradiation by electron andγray,and the value is correlated with the total ionizing dose.The optical power is seriously degraded after the electron irradiation,indicating that the electron irradiation causes more damage than that by theγray doses,which can be attributed to the displacement damage induced by the electrons.The dark current and capacitance of the PIN photodetector increases notably after the proton irradiation,which leads to deep-energy level defects in the semiconductors,impairing the performance of the laser diode through a reduction in the minority carriers’diffusion length.The radiation hardness of the EDFA is determined by the erbium-doped fiber.The gain and the noise of the EDFA system become very bad when the erbium-doped fiber is irradiated under60Co-γ.The silica fiber’s radiation damage is mainly determined by the total dose effect,and the loss of the optical power degreases with the increase of the optical wavelength.In addition;minor dose rate effect is observed,allowing a flexible choice of an appropriate dose rate within the limit of the experimental conditions.The research results can provide a reference for the selection of components,the evaluation of radiation effects,and the radiation-hardening design for the space laser communication systems.

关 键 词：半导体激光器 光电二极管 掺铒光纤放大器 光纤 辐射效应 

分 类 号：V416.5[航空宇航科学与技术—航空宇航推进理论与工程] O242.2[理学—计算数学]