激光与光电子学进展, 2019, 56 (16): 162901, 网络出版: 2019-08-05
少模光纤受激布里渊散射效应理论研究 下载: 1078次
Stimulated Brillouin Scattering in Few-Mode Fiber
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 stimulated Brillouin scattering few-mode fiber Brillouin gain spectrum Brillouin phase shift spectrum
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。
Abstract
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 acousto-optic 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.
王旭, 秦祖军, 熊显名, 张文涛. 少模光纤受激布里渊散射效应理论研究[J]. 激光与光电子学进展, 2019, 56(16): 162901. Xu Wang, Zujun Qin, Xianming Xiong, Wentao Zhang. Stimulated Brillouin Scattering in Few-Mode Fiber[J]. Laser & Optoelectronics Progress, 2019, 56(16): 162901.