研究了一种基于非线性偏振旋转被动锁模没有进行色散管理的全正色散掺镱光纤激光器,在无外加滤波器的情况下实验产生了锁模耗散孤子脉冲。耗散孤子的形成是激光器中正光纤色散、非线性效应、腔传输、增益饱和和滤波效应综合作用的结果。实验产生的锁模耗散孤子脉冲能量达1.1 nJ。此外,对激光器的数值模拟结果与实验结果相一致,证实了全正色掺镱光纤激光器在无外加滤波器的情况下也可以产生稳定锁模耗散孤子脉冲。 An all-positive dispersion Ytterbium-doped fiber laser based on non-linear polarization rotation passive mode-locked without chromatic dispersion was studied. The mode-locked modeled dissipative soliton pulse was generated experimentally in the absence of an external filter. The formation of dissipative solitons is the result of a combination of positive fiber dispersion, nonlinear effects, cavity propagation, gain saturation and filtering effects in a laser. The experimentally generated mode-locked soliton pulse energy reaches 1.1 nJ. In addition, the numerical simulation results of the laser are consistent with the experimental results, confirming that the all-positive Ytterbium-doped fiber laser can generate stable mode-locked dissipative soliton pulses even in the absence of an additional filter.