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掺杂浓度的提高影响了掺铒光纤放大器(EDFA)的性能,对经典Giles模型提出了新的要求。首先研究了高掺杂下铒离子距离较小引起的上转换过程的机理,通过优化速率方程模型分析了上转换过程对EDFA的影响,得出了在泵浦光和信号光远远大于ASE光的假设下泵浦光和信号光沿光纤长度变化的近似表达式,并将该近似分析解与解析解进行了比较。仿真结果表明上转换过程会降低随光纤传输的信号光和泵浦光,影响EDFA的放大性能,并得出了当掺铒浓度大于2.95×1025m-3时,上转换过程的影响不能忽略的结论。
The increase of doping concentration affects the performance of EDFA, and puts forward new requirements for the classical Giles model. Firstly, the mechanism of up-conversion caused by the small distance of erbium ions under high doping was studied. The influence of up-conversion process on EDFA was analyzed by optimizing the rate equation model. It was found that when the pump light and the signal light were much larger than the ASE light The approximate expression of the change of pump light and signal light along the length of optical fiber under the assumptions of the fiber length is compared and the approximate analytic solution is compared with the analytic solution. The simulation results show that the up-conversion process will reduce the signal and pump light transmitted along the optical fiber and affect the amplification performance of the EDFA. The conclusion that the up-conversion process can not be neglected when the erbium concentration is greater than 2.95 × 1025m-3 .