大芯径光纤基模功率传输特性与折射率分布形式关系的研究  

Investigation of the Power Transmission Characteristics of Fundamental Mode of Large-Core Fiber and Their Relation with the Type of Refractive Index Profile

作　　者：沙剑波[1] 高侃[1] 董小鹏[2] 

机构地区：[1]中国电子科技集团公司第二十三研究所光纤传感器研发中心,上海200437 [2]厦门大学信息科学与技术学院,福建厦门361005

出　　处：《激光与光电子学进展》2013年第3期81-86,共6页Laser & Optoelectronics Progress

摘　　要：研究和分析了光纤芯区径向折射率分布对大芯径光纤基模的功率传输特性(主要包括最大功率密度和等效模面积这两个参数)的影响。采用一种可适用于多种光纤实际折射率分布的独特数学表达式,研究了折射率分布形状变化时大芯径光纤基模在横截面内功率密度分布与等效模面积的变化,并将结果与阶跃型折射率光纤进行对比。计算结果表明,在传输功率相同、光纤基模与高阶模等效折射率差大于10-4的前提下,折射率在芯区中心有一定凹陷的分布可以有效降低横截面内基模功率密度的最大值,增大基模的等效模面积。这一研究为设计和制作可以传输更大功率的大芯径的无源和有源单模光纤提供了理论基础。The influence of various types of index profiles on the characteristics of power transmission, including the effective mode area （Aeff） and the maximum power density （Dmax） in the cross section, is investigated. A unique expression for the index profile, which is appropriate to the most practical index distributions of optical fibers, is employed in the calculation of Aeff and Dmax with the comparison of the step index profile. The simulation result indicates that under the condition of equal transmission power and the difference of the mode effective index （△neff） larger than 10 4, the index profile with a center dip will effectively lead to the reduction of Dmax and the increase of Aeff^-. This research provides theoretical basis for the design and fabrication of passive large core fiber for large power transmission.

关 键 词：光纤光学 大芯径光纤 折射率分布 功率密度 光纤激光器 光纤放大器 

分 类 号：TN253[电子电信—物理电子学]