报道了一种L波段的高功率亚皮秒掺铒光纤激光器。在全光纤环形腔内熔接2个偏振控制器（PC）和偏振相关的光隔离器（ISO），基于非线性偏振旋转锁模原理实现了全光纤结构锁模激光脉冲输出。输出激光的中心波长为1603 nm，脉冲重复频率为37.8 MHz，单脉冲能量为4 nJ，平均输出激光功率为152 mW。对此全光纤锁模激光器进行合理的色散控制，可得到脉冲宽度为370 fs的锁模激光输出。实验中使用高掺杂浓度的掺铒光纤，有效减少了其使用长度，提高了抽运转换效率，实现了结构简单紧凑、性能稳定可靠的L波段亚皮秒光纤激光器。

A L-band high power sub-picosecond erbium-doped fiber laser is reported. Two polarization controllers (PC) and a polarization dependent optical isolator (ISO) are fused in all fiber ring cavity, and the mode-locked laser pulse output of all fiber structure is realized based on nonlinear polarization rotation mode locking principle. The center wavelength of the laser is 1603 nm, the pulse repetition rate is 37.8 MHz, the single pulse energy is 4 nJ, and the average output laser power is 152 mW. Reasonable dispersion management is carried out on the all fiber mode-locked laser, and the mode-locked laser output with pulse width of 370 fs can be obtained. The erbium-doped fiber with high doping concentration is adopted in experiment, and its length is reduced effectively. The pump conversion efficiency is improved. The L-band sub-picosecond fiber laser with simple and compact structure, stable and reliable performance is realized.