为研究光学器件对全光纤电流互感器温度稳定性的影响, 分析了起偏器、直波导相位调制器、延时光纤线的偏振串扰对全光纤电流互感器的精度的影响。对每种光学器件, 在其环境温度变化范围为-40～+70 ℃时, 测试了起偏器输出光消光比变化, 以及直波导相位调制器、延时光纤线的偏振串音变化情况; 也测试了对应的全光纤电流互感器的精度变化情况。测试结果表明, 直波导相位调制器、延时光纤线因环境温度变化引起的偏振串扰会引起全光纤电流互感器的精度变化, 其中直波导相位调制器是决定全光纤电流互感器的温度稳定性的关键器件。

In order to study the influence of optical devices on the temperature stability of fiber optical current transformer (FOCT), the polarization crosstalk’s influence of 3 types of optical devices： polarizer, LiNbO3 phase modulator and PM(Polarization Maintaining) fiber delay line, on FOCT’s accuracy is analyzed. With each of above optical device’s ambient temperature over a range from -40 ℃ to +70 ℃, the extinction ratio variation of the polarized light from polarizer, the polarization crosstalk variations of LiNbO3 phase modulator and PM fiber delay line, and the error variations of FOCT are tested. The results show that the polarization crosstalk variations with the temperature of the LiNbO3 phase modulator and the PM fiber delay line cause FOCT’s error variation, and LiNbO3 phase modulator is the key component that can affect FOCT’s temperature stability.