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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600~1700 nm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。
Using full vector finite element method, the influence of lateral pressure on the birefringence of high-birefringence microstructures fiber is theoretically analyzed. Compared with other reports, hydrostatic pressure is used to study the birefringence changes of microstructured fibers. The results show that the changes of the birefringence and the birefringence of the fiber caused by the lateral pressure along the slow axis and the fast axis of the microstructured fiber are inconsistent in the wavelength range of 600 ~ 1700 nm. In addition, the effects of the phase birefringence pressure sensitivity and mode birefringence pressure sensitivity of microstructured fibers are also different along the slow axis and the fast axis of the microstructured fiber. The results of this study are of great guiding significance for the design of microstructured optical fiber, microstructured optical fiber sensor, especially multidimensional optical fiber sensor.