分析了影响保偏光子晶体光纤(PM-PCF)双折射温度敏感性的因素，利用有限元法仿真研究了热光效应和热膨胀效应对典型的实心结构PM-PCF 双折射温度敏感系数的影响。结果表明在-150 ℃~+150 ℃的工作温度范围内，热光效应对双折射的影响可以忽略。得到了这种PM-PCF 双折射温度敏感系数与相邻空气小孔圆心距离Λ的多项式模型，在Λ =5.24 μm 时，双折射的温度敏感系数为零。制作了5 根不同Λ的PM-PCF 样品，采用基于混合Sagnac干涉仪的测量技术分别测试了样品光纤双折射值随温度的变化，在Λ=5.16 μm 时，双折射的温度敏感系数为零，与仿真结果吻合。

The factors that affect the temperature sensitivity of typical polarization- maintaining photonic crystal fibers (PM-PCF) are analyzed. By using the finite elements method, the influence of temperature on the birefringence of the typical solid core PM- PCF is studied, which mainly includes thermo- optic effects and thermal expansion. The results show that the thermo- optic effects can be neglected and the temperature sensitivity of birefringence can be represented only by a polynomial function of the center distance of adjacent air holes Λ under the working temperature from - 150 ℃ to 150 ℃ . The birefringence increases with Λ and becomes zero at Λ =5.16 μm. The compact hybrid Sagnac interferometer is used to measure the birefringence of five PM-PCF samples with different Λ under different temperatures. The experimental results conform well to the simulation.