中文摘要：

提出了利用打靶法模拟双级双程泵浦结构掺铒光纤宽带光源的算法，该算法通过对打靶法的初值校正部分进行改进，加入了阻尼因子与下降因子，并把这两个因子同时应用到初值校正中，从而克服了传统打靶法在铒纤长度较长时校正矩阵奇异造成的算法不收敛的缺点。结合宽带光源的理论模型，给出了算法的实际过程，模拟得到了在光纤最佳长度处的C＋L波段输出谱型，并通过实验证实了模拟与实验结果相符合。最后讨论了导致宽带光源输出谱型不是最佳的因素，随着光纤长度增加导致的损耗，以及两端泵浦功率的比值，并给出了在泵浦功率比是最佳和不是最佳两种情况下的实验谱型。

英文摘要：

An algorithm for simulating two-stage two-pass Erbium-doped fiber broadband light source with shooting method was proposed. This algorithm improved the original value correct part of the shooting method, added the block coefficient and descend coefficient, and used the two coefficients at the same time in the original value correct part. The algorithm overcame the disadvantage that the algorithm convergence was caused by the correct matrix singularity when the fiber became longer. The operation process of the algorithm was given based on the theory model for the broad band light source, The C＋L band output picture was obtained by simulation at the optimal length. The simulation result accords with the experiment result. At last, we discussed the factors that lead to the broad-band light source output picture is not optimal. The factors included the loss when the fiber became longer and the two-end pump power ratio and we also gave the experiment picture under the optimal pump power ratio and unoptimal pump power ratio,