本文系统地分析了偏振有关光隔离器的性能，讨论了光隔离器中各元件的加工精度、表面反射率以及光纤耦合等因素对光隔离器特性的影响。理论分析表明，当各元件表面的光强反射率＜０．２５％，４５°法拉第旋转器的法拉第旋转误差＜４．３°，偏振器Ｐ１和Ｐ２透光轴之间的夹角误差＜０．５７°时，可以得到隔离度＞４０ｄＢ、正向损耗＜０．９ｄＢ的光隔离器。在实验中，我们已成功地研制了１．５５μｍ和１．３μｍ带尾纤的光隔离器，隔离度＞４０ｄＢ、正向损耗＜ｌ．５ｄＢ。 This paper systematically analyzes the performance of the polarization-dependent optical isolator and discusses the influence of the processing accuracy, surface reflectivity and fiber coupling of the optical isolator on the optical isolator characteristics. The theoretical analysis shows that when the light reflectance of each component surface is less than 0.25%, the Faraday rotation error of the 45 ° Faraday rotator is less than 4.3 °, the angle error between the transmission axes of polarizers P1 and P2 is less than 0 .57 °, you can get the isolation of> 40dB, forward loss <0.9dB optical isolator. In the experiment, we have successfully developed 1.55μm and 1.3μm pigtailed optical isolators, isolation> 40dB, forward loss