基于扩展的标量非线性薛定谔方程，理论研究了不同抽运方式对正色散腔被动锁模掺镱光纤激光器输出特性的影响。结果表明，在初始总增益相同条件下，对于给定的增益饱和能量，反向抽运时耗散孤子的光谱宽度和脉冲宽度均比正向抽运时小，而对应的脉冲峰值功率比正向抽运时高，并且反向抽运时脉冲的啁啾线性拟合度相比正向抽运时低。当增益饱和能量相同时，正、反向抽运获得的耗散孤子的能量相等，但两种抽运方式下耗散孤子的光谱和时域波形的差异程度随增益饱和能量的增加而增大。

Based on the extended scalar nonlinear Schrdinger equation, the influence of pumping schemes on the properties of dissipative solitons is investigated theoretically in passively mode-locked ytterbium-doped fiber laser with positive dispersion cavity. The results show that, under the condition of the same initial overall gain, the dissipative solitons obtained in the backward-pumped fiber laser have narrower spectral width, shorter pulse duration and higher pulse peak power than those of forward pumping scheme for the given gain saturation energy. Moreover, the linear fitting degree of the pulse chirp is lower. For the forward pumping and backward pumping schemes, the pulse energies of the dissipative solitons are equal with the same gain saturation energy, but the differences of the output spectral and temporal waveforms increase as the incrense of the gain saturation energy.