光纤参数对弱导阶跃光纤线偏振模式特性的影响  

Influences of Optical Fiber Parameter on Mode Characteristic of Linear Polarization in Step-Index of Weakly Guiding

作　　者：李松柏[1] 杨敏[1] 陈建国[2] 傅玉青[2] 

机构地区：[1]长江师范学院物理学与电子工程学院,重庆408100 [2]四川大学电子信息学院,四川成都610064

出　　处：《激光与光电子学进展》2011年第11期85-90,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(60578013);重庆市教委科技项目(KJ091307)资助课题

摘　　要：利用标量解法,导出了弱导阶跃光纤线偏振模(LPmn)的场分布和LPmn混合模式的光强表达式。结果表明,低阶LPmn模的模场范围均随纤芯半径的增加而增大,随纤芯折射率的增加而缩小,随包层折射率的增加而扩大;随传输距离和模式混合份额的增加,LPmn混合模式的光强减少;非相干混合模的M2因子随高阶模式光强所占分额的增加而逐渐变大,M2并非一直随纤芯半径的增加而增大,存在着一个临界值a=30μm。Using the scalar method, the field distribution of the linear polarization in a step-index of weakly guiding and the hegeneral expression of the mixed modes are derived. The results show that, the mode field ranges of the lowed LPmn increases with the fiber core radius and the coating layer index. The mode field ranges of the lowest order LPmn modes reduces with the increase of the fiber core index. The optical strength of the mixed modes reduces with the increase of the transmission distance and the proportion of mixed modes. The M2 factor of the uncoherent mixed modes increases gradually with the increase of the proportion of the highest order LPmn modes. Howerer, the increase of M2 factor approaches a critical value when the fiber core radius is a = 30μm.

关 键 词：导波光学 标量法 线偏振模 模式特性 阶跃光纤 

分 类 号：TN248.1[电子电信—物理电子学]