应用光波导理论和矩阵理论建立了分析空芯布喇格光纤的光传输理论模型，对具有不等周期的布喇格光纤结构，以最小输出功率流为优化目标进行仿真，设计出具有8个外包层的布喇格光纤，并分析了其损耗特性。该结构具有外包层数小、结构简单、损耗低的特点，有利于空芯布喇格光纤的制造和应用。

Based on light-waveguide and matrix theory,the theoretical light transmission model is set up to analyse the hollow-core Bragg fiber. The unequal-period Bragg fiber structure is simulated in order to get the minimum out-flowing flux. The fiber with eight cladding-layers is obtained through optimum design,and its loss characteristic is analyzed. This simple structure is very useful for the fabrication and application of Bragg fiber due to its low loss and small number of cladding layers.