混合导引型光子晶体光纤中纤芯折射率相关的导光特性研究  

Guidance characteristics correlated to the core refractive index in a hybrid photonic crystal fiber

作　　者：程同蕾[1] 柴路[1] 栗岩锋[1] 胡明列[1] 王清月[1] 

机构地区：[1]天津大学精密仪器与光电子工程学院,光电信息技术科学教育部重点实验室,天津300072

出　　处：《物理学报》2011年第2期347-351,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2006CB806002,2010CB327604);国家高技术研究发展计划(批准号:2007AA03Z447);国家自然科学基金(批准号:60678012,60978022,60838004);高等学校博士学科点专项科研基金(批准号:20070056083,20070056073);教育部科学技术研究计划重点项目(批准号:108032),教育部新世纪优秀人才支持计划(批准号:NCET-07-0597)资助的课题~~

摘　　要：利用全矢量有限元法研究了一种混合导引型光子晶体光纤在纤芯折射率改变时,光纤导光机理和模式的演变特性.当纤芯折射率小于混合包层中空气孔包层的有效折射率时,芯模的导光机理为"双带隙导引型";当纤芯折射率位于空气孔和高折射率两套包层的有效折射率之间时,芯模的导光机理为"单带隙+全内反射导引型";当纤芯折射率大于高折射率棒包层的有效折射率时,芯模的导光机理为"全内反射导引型".并对该光纤在上述三种条件下的导光特性进行了比较和讨论.这些结果对设计特殊用途的光子晶体光纤具有指导意义.The properties of light guiding mechanism and modes relating to the core refractive index in a hybrid photonic crystal fiber （PCF） are numerically investigated by the full-vectorial finite element method. The light guiding mechanism of core mode is the double-bandgap-guiding when the core refractive index is smaller than the effective index of the air-hole cladding in the hybrid-PCF. If the core refractive index is between the refractive indexes of the two kinds of hybrid-claddings,there is a co-operative action of the index-guiding and the bandgap-guiding on the guide mode in the core. Only the total internal reflection guiding occurs in the fiber when the core refractive index is greater than the effective index of the high-index rod cladding. Comparison of these guiding properties in the hybrid-PCF are also carried out. The results provide guidance for the design of hybrid photonic crystal fiber for special purposes.

关 键 词：混合导引型光子晶体光纤 带隙 模式 

分 类 号：TN253[电子电信—物理电子学]