基于改进自适应遗传算法的高斯掺杂四线偏振模光纤放大器  

Design of Gaussian-doped four-mode fiber amplifier by improved adaptive genetic algorithm

作　　者：黄勇[1] 秦祖军[1] HUANG Yong;QIN Zujun(School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2021年第6期442-448,共7页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(61665001)。

摘　　要：针对阶梯式或多环式复杂铒离子掺杂结构的光纤制备困难,以及单段掺铒光纤少模放大器难以实现四阶及以上高阶模式增益均衡放大,提出一种由两段简单高斯掺杂掺铒光纤级联而成的四线偏振模掺铒光纤放大器(4LP-EDFA),并设计了改进自适应遗传算法对放大器性能进行优化。结果表明,当两段光纤的长度分别为3.33m和3.16m,高斯掺杂中心位置分别为0.12a和0.78a处(a为光纤纤芯半径),高斯分布的1/e半宽度分别为0.1a和0.16a时,4LP-EDFA获得约24.52d B的平均模式增益和近乎可忽略的差分模式增益(DMG)。设计结果同时发现,两段高斯掺杂光纤中的第一段光纤的长度变化、高斯掺杂中心的位置变化、高斯分布的1/e半宽度变化对放大器增益特性的影响更为显著。In view of the difficulty in preparing fiber with stepped or multi-ring erbium-doped structure and the difficulty in achieving gain equalization amplification in fourth-order and higher-order mode by using few-mode fiber amplifier with single-segment erbium-doped fiber,a four-line polarization mode erbium-doped fiber amplifier(4LP-EDFA)is proposed,which is composed of two simple Gaussian-doped erbium-doped fibers,and an improved adaptive genetic algorithm is designed to optimize the performance of the amplifier.The results show that when the lengths of two optical fibers are 3.33 m and 3.16 m respectively,the Gaussian doping centers are 0.12 a and 0.78 a respectively(a is the core radius of optical fiber),and the 1/e half width of Gaussian distribution is 0.1 a and 0.16 a respectively,the 4LP-EDFA can obtain an average mode gain of about 24.52 dB and a negligible differential mode gain(DMG).At the same time,it is found that the length of the first fiber,the position of Gaussian doping center and the 1/e half width of Gaussian doping have more significant effects on the gain characteristics of the amplifier.

关 键 词：少模光纤 高斯掺杂 掺铒光纤放大器 自适应遗传算法 

分 类 号：TN913.7[电子电信—通信与信息系统] O436[电子电信—信息与通信工程]