摘要
高阶模光纤通常是一种多包层结构的大模场光纤。为了获得模场面积较大的包层高阶模以抑制高功率光纤激光器或放大器中的非线性效应和避免光纤损伤,高阶模光纤的结构参数需要满足一些基本条件。利用波动方程理论推导了多包层阶跃折射率分布的高阶模光纤的特征方程,说明了高阶模光纤结构参数选择的依据和方法,并通过数值计算,分析了高阶模光纤包层的半径及折射率大小对纤芯导模的影响。结果表明,当高阶模光纤的包层半径和折射率大小满足一定的条件时,光纤包层结构不会影响纤芯的模场分布,包层高阶模的模场还会出现均匀分布的特点。
Usually, the high-order-mode fiber is a kind of large mode area fiber with multi-cladding. In order to obtain a large mode area to suppress the fiber nonlinear effects and avoid optical damage in high power fiber lasers and amplifiers, the structural parameters of a high-order-mode fiber need to meet certain conditions. The characteristic equation of high-order-mode fiber with multi-cladding and step-index distribution is derived with the theory of wave equation. According to this equation, the basis and method of choosing structural parameters for high-order-mode fiber are also described. And through numerical calculation, it analyzes the influence of the fiber cladding radius and refractive index on the core guided mode. The result shows that, under certain conditions, the cladding structure of the fiber does not affect the mode field distribution in the core and the mode field distribution in fiber cladding of certain high-order-mode can appear uniform distribution.
出处
《激光与光电子学进展》
CSCD
北大核心
2015年第6期86-92,共7页
Laser & Optoelectronics Progress
基金
广西自然科学基金(2011GXNSFA018148
2013GXNSFAA019021)
关键词
光纤光学
大模场
高阶模光纤
多包层
特征方程
fiber optics
large mode area
high-order-mode fiber
multi-cladding
characteristic equation
