侧向压力对微结构光纤双折射的影响

Influence of Lateral Pressure on Phase and Group Modal Birefringence in Microstructure Fiber

采用全矢量有限元方法，理论上分析侧向压力对高双折射微结构光纤双折射特性的影响，与其他报道中采用流体静压力来研究微结构光纤的双折射变化有所不同。研究结果表明，在波长600～1700nm范围内，沿微结构光纤慢轴和快轴的侧向压力所引起的光纤相双折射和模双折射的变化并不一致。此外，沿微结构光纤的慢轴和快轴的侧向压力对微结构光纤的相双折射压力灵敏度和模双折射压力灵敏度的影响也不同。该研究结果对于微结构光纤的设计、微结构光纤传感器尤其是多维光纤传感器具有很大的指导意义。

The influence of lateral pressure on the birefringent characteristics of high-birefringent microstructure fiber is theoretically investigated using a full-vector finite element method, which is different from other reports applying hydrostatic pressure. In the wavelength range 600- 1700 nm, the results indicate that the variation of the phase and group modal birefringence is different, when the lateral pressure is applied along the slow axis and fast axis of the microstructure fiber, respectively. Furthermore, when the lateral pressure is applied along the slow axis and fast axis, respectively, the effect of lateral pressure on the sensitivity of phase and group modal birefringence of microstructure fiber is also different. The research has great signification in microstructure fiber designing, microstructure fiber sensors especially multidimensional optical fiber sensors.