摘要
基于波动光学理论和单模光纤受激布里渊散射(SBS)的数学模型,推导了少模阶跃折射率光纤中SBS时空演化耦合振幅方程。依据光波模式和声波模式模场空间分布,计算出不同模式对的声光耦合系数,进一步得到不同光波模式对组合的布里渊幅度增益谱和相移谱。结果表明:参与SBS过程的声波主要为低阶声波模式;对于LP01模和LP11模,两者更倾向于模内的SBS过程,且模内耦合产生的幅度增益以及相移更大;布里渊频移随着光波模式阶数的增加而减小。
Herein,numerical results for stimulated Brillouin scattering(SBS)in a step-index few-mode fiber are discussed based on the theory of wave optics and a mathematical model of SBS in a single-mode fiber.The acoustooptic coupling coefficient is calculated and a series of Brillouin gain spectra and phase shift spectra are presented according to the optical and acoustic mode profiles.Numerical results demonstrate that acoustic modes involved in the SBS process are primarily those with low mode orders.Compared to inter-mode SBS in LP01 and LP11 modes,intra-mode SBS is more critical,wherein the latter can obtain larger Brillouin gain and phase shift.In addition,the Brillouin frequency shift evidently decreases as the optical mode order increases.
作者
王旭
秦祖军
熊显名
张文涛
Wang Xu;Qin Zujun;Xiong Xianming;Zhang Wentao(School of Electronic Engineering and Automation,Guilin University of Electronic Technologyt Guilin,Guangxi541004,China;Guangxi Key Laboratory of Automatic Testing Technology and histruments, Guilin,Guangxi 341004,China;Key Laboratory of PhotoelectricInformation Processingin Guangxi Universities,Guilin,Guangxi 541004,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2019年第16期231-237,共7页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61665001)
关键词
散射
受激布里渊散射
少模光纤
布里渊增益谱
布里渊相移谱
scattering
stim ulated Brillouin scattering
few-mode fiber
Brillouin gain sp ectrum
Brillouin phase shift spectrum
