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分析了具有反共振反射的蜘蛛网包层塑料空芯光纤在1.3μm波段的损耗特性及其与结构参数的关系。将光纤包层等效为周期性多层膜,用渐近转移矩阵法进行数值模拟。为优化光纤结构参数,分析了包层层数N,高折射率层厚度d2和高、低折射率比值n2∶n1对损耗的影响。计算结果表明,随着N的增加,损耗首先快速下降最后达到一个固定值;模式损耗随d2的增加呈线形增大趋势,n2∶n1越大,反共振波长处的损耗越低。在此基础上,用模拟退火优化算法对空气层厚d1和纤芯半径rco进行了最优化求解。最后,用以上求得结构参数的优化组合即N=3,d2=2.648μm,n2∶n1=1.49∶1.0,d1=3μm和rco=100μm,计算得到最低损耗是0.449dB/km。
The loss characteristics of anti-resonance reflective spider-net plastic hollow fiber in the 1.3μm band and its relationship with the structural parameters were analyzed. The fiber cladding is equivalent to a periodic multi-layer film, which is simulated by the asymptotic transfer matrix method. In order to optimize the fiber structure parameters, the influence of the cladding layer number N, the thickness of high refractive index layer d2 and the high and low refractive index ratio n2: n1 on the loss was analyzed. The results show that with the increase of N, the loss rapidly decreases first and finally reaches a fixed value. The mode loss increases linearly with the increase of d2. The larger n2: n1, the lower the loss at the anti-resonance wavelength. Based on this, the optimization of the air layer thickness d1 and the core radius rco is solved by simulated annealing optimization algorithm. Finally, the minimum loss is calculated to be 0.449 dB / km using the optimized combination of structural parameters obtained above, ie N = 3, d2 = 2.648 μm, n2: n1 = 1.49: 1.0, d1 = 3 μm and rco = 100 μm.