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设计了基于断环结构的全固光子带隙光纤,其背景材料为熔石英而断环结构由若干掺杂的高折射率介质柱构成.基于平面波展开法计算得到的态密度图和Bloch模场分布表明,该种光纤中的一个高阶带隙可以得到调节并被极大展宽,带隙调节的基本原理是断环可以同时控制包层介质柱的线偏振模式的角向和径向模式阶数.研究表明,断环中的介质柱数目决定了受影响最小的一组线偏振模式的最高角向阶数,而带隙宽度受介质柱尺寸影响很大.这一宽的高阶带隙可以用来设计带隙中心分别在800和1550nm、带宽分别为488和944nm的全固光子带隙光纤,且带隙内的缺陷模式具有典型的正常-零-反常色散特性.
An all-solid photonic bandgap fiber based on a ring-broken structure is designed, whose background material is fused quartz and the ring-broken structure is composed of several doped high refractive index media columns. The density of states and the Bloch mode field calculated from the plane wave expansion method The distribution shows that a high-order bandgap in the optical fiber can be adjusted and greatly broadened. The basic principle of the bandgap adjustment is that the broken ring can simultaneously control the angles and radial modes of the linear polarization mode of the cladding dielectric column The results show that the number of dielectric columns in the ring determines the highest order angle of the least affected group of linear polarization modes and the width of the bandgap is greatly affected by the size of the dielectric column.The wide bandgap It can be used to design all-solid photonic bandgap fibers with bandgap centers of 800 and 1550 nm and bandwidths of 488 and 944 nm, respectively. The defect modes in the bandgap exhibit typical normal-zero-anomalous dispersion.