红外与激光工程, 2015, 44 (S): 0093, 网络出版: 2016-01-26   

多模光纤布里渊散射谱及阈值理论计算

Theoretical calculation of Brillouin scattering spectrum and SBS threshold in multimode fiber
作者单位
1 华北电力大学电子与通信工程系,河北 保定 071003
2 华北电力大学河北省输变电设备安全防御重点实验室,河北 保定 071003
摘要
从受激布里渊散射耦合波导方程出发建立了多模光纤布里渊频移、泵浦波、斯托克斯波和声波场理论模型,分析对比了多模光纤与单模光纤布里渊散射谱的频移、增益、线宽和受激布里渊散射阈值,并进一步分析了光纤长度、衰减系数、数值孔径对多模光纤受激布里渊散射阈值的影响。结果表明,多模光纤多个模式布里渊散射谱叠加造成其总的布里渊散射谱展宽,不再满足洛伦兹分布,其线宽增加至原来数倍、峰值增益和频移降低;渐变折射率多模光纤SBS阈值一般在80 mW以上,远大于单模光纤;纤芯直径相同时,相比于阶跃折射率多模光纤,数值孔径对渐变折射率多模光纤SBS阈值的影响较大,后者更易发生受激布里渊散射效应。理论计算与已报道测量结果的比较验证了理论分析的正确性。文中研究为建立基于多模光纤的布里渊散射分布式传感系统奠定了理论基础。
Abstract
Based on the coupled wave equation of Stimulated Brillouin Scattering (SBS), the models of Brillouin frequency shift, the pump wave, Stokes wave and the acoustic field in multimode fiber were built. Analysis and comparison of the Brillouin sepectrum frequency, peak gain, linewidth and SBS threshold between the multimode and single mode fiber were conducted. And then the influences of optical fiber length, attenuation coefficient and numerical aperture on the SBS threshold were discussed. The results show that, multiple modes of the Brillouin scattering superposition lead to spectrum broadening, linewidth increase, peak gain decrease and frequency shift reduce. The SBS threshold of the graded index multimode optical fiber is larger than 80 mW, which is far larger than the single mode fiber. When the core diameter is same, the graded index multimode fiber is more susceptible to takeplace the SBS effect, whose numerical aperture has more influences on SBS threshold than the step index multimode fiber. The reported measurement results validate the theoretical analysis. The studies in this paper laid a theoretical foundation for the distributed Brillouin scattering sensing system based on multimode fiber.

赵丽娟, 李永倩, 徐志钮. 多模光纤布里渊散射谱及阈值理论计算[J]. 红外与激光工程, 2015, 44(S): 0093. Zhao Lijuan, Li Yongqian, Xu Zhiniu. Theoretical calculation of Brillouin scattering spectrum and SBS threshold in multimode fiber[J]. Infrared and Laser Engineering, 2015, 44(S): 0093.

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