详细分析了非线性偏振旋转被动锁模光纤环形孤子激光器的自起动过程、孤子脉宽及稳定性与各激光参数的关系.通过孤子参量演化方程的求解.获得了激光器稳定运行后脉宽的解析表达式以及激光器的稳定运行条件. The relationship between the self-starting process, the soliton’s pulse width and stability and the laser parameters of the nonlinear polarization-locked passive mode-locked fiber toroidal soliton laser is analyzed in detail.The pulse width of the laser after stable operation is obtained by solving the soliton’s parametric evolution equation Expressions and stable operating conditions of the laser.