椭圆纤芯少模光纤参量放大器设计  

Design of Elliptical-Core Few-Mode Fiber Optical Parametric Amplifiers

作　　者：邢焕兴 武保剑 万峰 曹亚敏 文峰 邱昆 Xing Huanxing;Wu Baojian;Wan Feng;Cao Yamin;Wen Feng;Qiu Kun(Key Laboratory of Optical Fiber Sensing and Communication,Ministry of Education,School of Information and Communication Engineering,University of Electronic Science and Technology of China,Chengdu,Sichuan611731,China)

机构地区：[1]电子科技大学信息与通信工程学院光纤传感与通信教育部重点实验室

出　　处：《激光与光电子学进展》2019年第11期86-91,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61671108,61505021)

摘　　要：研究了椭圆纤芯少模光纤的模式特性,给出了少模光纤中克尔非线性耦合模方程的一般形式,详细描述了少模光纤参量放大器的设计方法。利用COMSOL仿真软件获得了导波光场模式分布对纤芯椭圆率的依赖关系,进而计算了少模之间的四波混频相位失配因子和相应的模场交叠积分(或非线性系数)。研究了阶跃型折射率分布的椭圆纤芯少模光纤中三个模群的简并四波混频过程。结果表明,当LP21a模的抽运光功率为0.5 W时,LP11a模的信号光增益达到20.15dB,在增益劣化2dB的范围内可允许的椭圆纤芯误差为0.6μm。Herein,we studied the mode characteristics of a few-mode fiber with an elliptical-core.We investigated the general expression of the Kerr nonlinear coupled-mode equations for the few-mode fiber and discussed the design process of an optical fiber parametric amplifier in detail.The dependence of the optical field mode distribution on core ellipticity was simulated using the COMSOL software,following which the phase mismatch factor in four-wave mixing and the corresponding mode field overlapping integral(or nonlinear coefficient)were calculated.In addition,we studied the degenerate four-wave mixing process of three mode groups in the elliptical-core few-mode fiber with a step refractive index distribution.The results show that when the LP21a-mode pump power is 0.5 W,the maximum gain of 20.15 dB can be obtained and the elliptical-core tolerance size is 0.6μm in the gain deterioration range of 2 dB.

关 键 词：光纤光学 少模光纤 光纤参量放大 模场分布 非线性系数 

分 类 号：O437[机械工程—光学工程]