报道了利用光纤非线性偏振旋转锁模方法,使用正常色散的高掺铒光纤提供高增益的同时,补偿谐振腔中普通单模光纤的反常色散,在展宽脉冲光纤环形激光器中直接产生了75 fs的超短脉冲输出.在125mW的抽运光功率下,其平均输出功率大于15mW,重复频率为25.9MHz,光谱宽度达到53nm,同时输出脉冲的能量也获得了极大的提高,单脉冲能量达到0.6nJ.该激光器操作简单,在锁模情况下运行稳定,其全光纤结构更有利于小型化和便携化. This paper reports the use of a non-linear polarization rotation mode-locking method to compensate the anomalous dispersion of ordinary single-mode optical fiber in a resonator by using a high-erbium-doped fiber with normal dispersion to provide high gain and directly generate 75 fs in broadened pulsed fiber ring laser Of the ultra-short pulse output at 125mW pump power, the average output power of more than 15mW, repetition frequency of 25.9MHz, the spectral width of 53nm, while the output pulse energy has also been greatly improved, single-pulse energy reaches 0.6nJ. The laser is simple to operate and operates stably under mode locking. Its all-fiber structure is more conducive to miniaturization and portability.