提出一种液晶填充碲酸盐玻璃的柚子型光子晶体光纤偏振旋转器, 利用全矢量有限元法, 对液晶填充碲酸盐玻璃的柚子型光子晶体光纤的偏振旋转特性进行数值模拟, 并分析了光纤结构参数、环境温度、工作波长等对光纤偏振旋转特性的影响.研究结果表明: 此种偏振旋转器具有较高的旋转效率、较低的工作串扰和较短的旋转长度, 在工作波长为1.55 μm、偏振角度为45°时, 其值分别达到99.947%、－32.84 dB和197 μm; 另外, 随着光纤薄壁厚度的增加, 旋转长度随之升高, 随着工作波长的变大, 旋转长度随之降低, 随着温度的增加, 旋转长度随之升高.这种新型的光子晶体光纤为偏振旋转器的研发提供了参考.

By employing the liquid crystal refractive index changes induced by an applied electric field, a polarization rotator was proposed based on liquid crystal infiltrated tellurite photonic crystal fiber. The mode field distribution of the fiber fundamental mode and the influence on polarization rotation of some parameters were simulated by using full vector finite element method. The results show that, this polarization rotator has a high work efficiency, low crosstalk and short conversion length. With the wavelength of 1.55 μm and the polarization angle of 45°, the values are 99.95%, －32.84 dB and 197 μm, respectively. The conversion length of the fiber becomes longer, when the thin wall thickness of grapefruit photonic crystal fiber is increasing or the temperature is decreasing. While the working wavelength is increasing, the conversion length of the fiber becomes shorter. The liquid crystal infiltrated tellurite photonic crystal fiber has a good polarization rotation performance, offering a reference for the design of polarization rotator, which is useful for making compact and diverse polarization rotation devices.