摘要
对纤芯为各向异性左手材料,包层为普通材料的光纤进行了相关研究。首先,从Maxwell方程组出发,得到了各向异性左手材料光纤振荡模的色散方程。根据这些色散方程及其当前左手材料实际结构,同时考虑实际左手材料的频率色散特性,画出了TE、TM、HE和EH振荡模的色散曲线。通过对这些色散曲线的比较、分析,得到了一些振荡模的色散特性。比如:随着频率的增加,有效折射率也单调增加;TM振荡模有一定的群速,而EH振荡模有2个不同的群速,其突变频率约为4.46 GHz。此外,随着模阶数的增加,色散曲线向左上方移动;随着纤芯半径的增加,色散曲线向右下方移动,HE11振荡模的工作频域随着纤芯半径的增加而变宽。总之,这些都是有趣的色散特性,为进一步设计高性能光纤指明了方向。
An optical fiber with anisotropy metamaterials in the core and a common medium in the cladding is investigated. Firstly, four dispersion equations for the oscillating guided modes based on Maxwell＇s equations are obtained. From the dispersion equations, and considering frequency dispersion of practical metamaterials, some dispersion curves for TE,TM,HE and EH modes are plotted. Some new dispersion properties of the oscillating guided modes are gotten by analyzing and comparing these curves, such as： the effective-refractive index increases individual with the frequency; as frequency adds, TM oscillating guided modes have a fixed velocity and EH modes always have two different group velocities and mutation frequency is 4.46 GHz. Besides, as mode number increases, the dispersive curves move along up and left direction; however, as the core radius increases, the curves turn along down and right direction and the bandwidth of HEll oscillating guided mode becomes widely. In all words, these are interesting dispersion properties and may make a direction to design high quality fiber.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2011年第9期122-128,共7页
Chinese Journal of Lasers
基金
上海市科委重点实验室项目(08DZ2231100)
湖州师范学院理学院项目(GJC10006)资助课题
关键词
光纤光学
左手材料
振荡模
频率色散
fiber optics
metamaterial
oscillating guided modes
frequency dispersion
