研究了芯层折射率为正、包层折射率为负的光纤导模光学特性,通过色散曲线分析比较了与常规光纤的不同,表现为低阶的简并的模式更少,单模存在的区域更多.分析了当包层折射率趋于零时的光学特性,发现与前两种光纤的光学特性都不同.分析发现当包层的介电常数ε和磁导率μ有一个为零时,在V较小的区域各自出现了一条单模,与常规光纤的HE11模特性有很大不同,其色散曲线偏离方式与常规光纤相反,且出现了无模式存在的区域.
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