介绍了全正色散掺镱锁模光纤激光种子源及光纤放大器。系统包括利用非线性偏振旋转锁模的种子源和正向抽运的放大器两部分。实验中得到了平均功率为125 mW 的锁模激光种子源，其输出脉宽约为4 ps，重复频率为88.3 MHz。经过放大器放大后，平均功率达到3.5 W，脉宽为7.2 ps，单脉冲能量为39.64 nJ。

An all normal-dispersion Yb-doped mode-locked fiber laser and its amplifier are demonstrated. The experiment system consists of two parts: nonlinear polarization rotation mode-locked fiber laser and amplifier with forward pump. In this experiment, a mode-locked fiber laser, whose repetition rate is 88.3 MHz, with the maximum average output power of 125 mW and 4 ps pulse width is obtained. After amplified, the maximum output power reaches 3.5 W on average, the pulse width and single pulse energy are 7.2 ps and39.64 nJ respectively.