We have proposed a new design of microstructured optical fibres (MOFs), containing three rings of identical circular holes around a core, with different separations between the rings. The properties of the MOFs have been analysed numerically using the finite element method (FEM), and the leakage loss in the spectral range 0.40 – 2.65 μm has been calculated for the fundamental and higher order modes at various parameters of the MOFs. We have demonstrated the presence of several local maxima in the spectral dependences of the leakage loss for higher order modes and examined the physical mechanism responsible for the formation of the maxima and the variation of their position with MOF parameters. It has been shown that the proposed MOF design allows for single-mode operation in the range 0.77 – 2.3 μm.

我们提出了一种新的微结构光纤 (MOF) 设计，在纤芯周围包含三个相同的圆孔环，环之间的间距不同。使用有限元法 (FEM) 对 MOF 的特性进行了数值分析，并计算了 MOF 不同参数下基模和高阶模式在 0.40 – 2.65 μm 光谱范围内的泄漏损耗。我们已经证明在高阶模式的泄漏损耗的光谱依赖性中存在几个局部最大值，并检查了导致最大值形成的物理机制以及它们的位置随 MOF 参数的变化。已经表明，所提出的 MOF 设计允许在 0.77 – 2.3 μm 范围内进行单模操作。