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由于光纤类器件对于辐射十分敏感,考虑到卫星光通信特定的辐射环境,要想采用地面已非常成熟的外调制技术,必须分析外调制技术中的核心器件EDFA在其中的可行性。采用60Co作为辐射源,国内首次对ED-FA及其内部重要组件隔离器和WDM耦合器进行了高剂量轨道和低剂量轨道辐照模拟实验,实验结果表明在总剂量为5krad的低剂量辐照情况下,EDFA在-2dBm的输入时,输出功率由辐照前的14.3dBm下降到14dBm,其它各组件的性能变化不是很大,可以直接使用,而在总剂量为1000krad的高剂量辐照情况下,输出功率下降到-25.3dBm,耦合器也产生了大约8dB的损耗,由于其性能下降明显,若在此种环境下使用,需考虑做空间辐射防护。
Due to the sensitivity of optical fiber devices to radiation, considering the special radiation environment of satellite optical communication, the feasibility of using EDFA, the core device in external modulation technology, must be analyzed in order to adopt the external modulation technology which is already mature on the ground. Using 60Co as a radiation source, the simulation experiments of ED-FA and its internal important components isolators and WDM couplers for the first time were carried out in China. The experimental results show that under low dose radiation with a total dose of 5krad In the case of EDFA input at -2dBm, the output power is reduced from 14.3dBm before the irradiation to 14dBm. The performances of other components are not changed so much that they can be directly used. In the case of high dose radiation with a total dose of 1000krad , The output power drops to -25.3dBm, the coupler also produces about 8dB loss, due to its performance decreased significantly, if used in such an environment, to be considered space radiation protection.