锥形光子晶体光纤的基模特性分析  

Fundamental mode characteristics in tapered photonic crystal fiber

作　　者：汪徐德[1] 罗爱平[1] 邓丽琼[1] 陈伟成[1] 朱日丹[1] 徐文成[1] 

机构地区：[1]华南师范大学信息光电子科技学院光子信息技术实验室,广州510006

出　　处：《激光杂志》2007年第4期49-51,共3页Laser Journal

基　　金：广东省自然科学基金赞助项目(No:04010397)。

摘　　要：本文研究了锥形光子晶体光纤(TPCF)的基模演化特性,分析了包层空气填充率对其特性的影响。数值计算结果表明TPCF比常规锥形光纤更能束缚模场;在相同的拉锥条件下,包层空气填充率越大的TPCF,其模场能保持芯模的形式传输更长的距离并且其芯区能量密度也越大。而TPCF的有效面积沿锥体纵向先缓慢减小,后急剧增大,最后又减小,随着空气填充率的增大,有效面积的最大值逐渐向锥尾方向移动。同时,对色散研究表明,在整个锥体中,色散值先负向增大,后正向增大;在空气填充率较小时,其色散曲线沿锥体纵向变化平缓,而空气填充率较大时,色散曲线起伏明显;并且随着空气填充率的减小,色散曲线的最低点移向初始拉锥端。Based on the fully vectorial effective index approach and-the finite difference method, the-fundamental made characteristics in the tapered photonic crystal fiber （TPCF） are analyzed and compared with conventional tapered fiber. The numerical results show that the TPCF can provide stnmger mode confinement than conventional tapered fiber. In the same tapering nmnner, the core made can propagate in smaller diameter in high air - filling fraction TPCF, while in this diameter the propagation made transfers from the core made to the cladding mode in low air- filling fraction TPCE. Furthermore, the variations of effective area, energy density and the dispersion properties of TPCF with different air firing fractions and diffexent positions in taper are investigated respeetively.

关 键 词：光子晶体光纤 锥形光纤 有效折射率 色散 有效面积 

分 类 号：TN252[电子电信—物理电子学]