This work reports some important optical characteristics of porous core photonic crystal fiber (PC-PCF) for four different core structures which are elliptical, circular, square, and hexagonal. Numerical analysis based on the finite element method (FEM) shows that for the same core area, an elliptical core demonstrates the highest birefringence that ensures reliable polarization-maintaining applications. Moreover, other modal characteristics such as absorption loss, confinement loss, dispersion, power fraction, and effective area are also investigated thoroughly and compared. Besides, the suspended elliptical core PCFs can be fabricated easily with the existing fabrication technology.

这项工作报告了椭圆形、圆形、方形和六边形四种不同纤芯结构的多孔纤芯光子晶体光纤 (PC-PCF) 的一些重要光学特性。基于有限元法 (FEM) 的数值分析表明，对于相同的纤芯面积，椭圆纤芯表现出最高的双折射，可确保可靠的保偏应用。此外，还对吸收损耗、约束损耗、色散、功率分数和有效面积等其他模态特性进行了深入研究和比较。此外，悬浮椭圆芯PCFs可以很容易地用现有的制造技术制造。