用性能稳定的976 nm激光二极管(LD)作为抽运光源,利用非线性偏振旋转(NPR)作为可饱和吸收体,实现了环形腔结构的被动锁模掺Er3+光纤激光器.在抽运功率为57 mW时,通过调节与波长无关的全光纤在线偏振控制器,获得了谱线宽度为40.8 nm,中心波长1544.0 nm,脉冲宽度为78 fs的稳定飞秒脉冲激光,其重复频率为11.18 MHz,平均输出光功率为5.4 mW,单个脉冲能量为0.5 nJ,峰值功率为6200 W. A stable mode-locked 976 nm laser diode (LD) was used as the pumping light source, and NMP was used as a saturable absorber to achieve a passively mode-locked Er3 + -doped fiber laser with a ring cavity structure. At a pumping power of 57 mW, a stable femtosecond pulse laser with a spectral width of 40.8 nm, a center wavelength of 1544.0 nm and a pulse width of 78 fs was obtained by adjusting the all-fiber in-line polarization controller irrespective of the wavelength, with a repetition frequency of 11.18 MHz and an average of The output optical power is 5.4 mW, with a single pulse energy of 0.5 nJ and a peak power of 6200 W.