摘要
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HE_(11)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。
The optical characteristics of guided modes in a fiber formed by a core with usual refractive index and a negative refractive index cladding are studied. The difference compared with normal fiber is analyzed through the dispersion curves showing less degenerate modes and larger single-mode area. When the cladding refractive index tends to zero, the optical characteristics are different from the former two fibers. A single-mode in the smaller region V is found, when the permittivity or permeability of the cladding is zero. It is quite different from the mode HEm in a normal fiber, its dispersive curve has an opposite tendency, and there are some areas where no modes could exist.
出处
《量子电子学报》
CAS
CSCD
北大核心
2010年第5期637-640,共4页
Chinese Journal of Quantum Electronics
关键词
纤维与波导光学
负折射率
零折射率
单模
fiber and waveguide optics
negative refractive index
zero refractive index
single mode
