理论仿真和实验研究了偏振反馈对基于半导体光放大器(SOA)的光纤环激光系统的动态响应的影响。在建立的各向同性SOA光纤环系统的速率方程基础上对系统的工作状态进行了稳态与混沌态的仿真研究。仿真结果表明，对各向同性的SOA光纤环系统，稳态下可通过环路偏振态的90\O扭转反馈，实现正交偏振的双稳态输出；而在非稳态下通过调节环路偏振态转换，可得到全偏振态遍历的偏振混沌输出。建立了基于SOA光纤环的偏振混沌的实验系统，通过调节光纤环路的偏振转换特性，实验观察到了系统稳态工作下的正交偏振调制输出，以及混沌态下动态偏振度小于1%的偏振混沌输出。实验结果与理论仿真结果一致。

The influence of the polarization feedback of the fiber ring on the dynamics of the isotropic semiconductor optical amplifier (SOA)-based fiber ring system is studied by theoretical simulation and experiment. It is found from simulation that a bistable orthogonal-polarization light under stationary can be realized by a polarization feedback of a 90°-rotation, and a dynamically-depolarized polarization chaos under non-stationary can be realized by properly setting polarization feedback. Experimentally, such a orthogonal-polarization modulation light is observed and a dynamically-depolarized polarization chaos with dynamical degree of polarization less than 1% is obtained in a SOA fiber ring system. The experimental results are well consistent with the theoretical simulations.