南京航空航天大学学报（英文版）2021，Vol.38Issue(5)：769-787,19.
二氧化锗掺杂光纤中折射率分布对布里渊增益谱的影响
Influence of Refractive Index Distribution on Brillouin Gain Spectrum in GeO2?Doped Optical Fibers
摘要
Abstract
GeO2 is commonly used as dopant to adjust the refractive index profile(RIP)and the acoustic velocity profile(AVP)in the fiber,thereby forming different Brillouin gain spectrum(BGS)characteristics such as Brillouin gain,acoustic mode number and peak intensity difference. When an optical fiber is used in optical fiber sensing or communication system,its BGS characteristics may play an important role in determining the performance of the system. In this paper,finite element analysis(FEA) method is used to study the influence of refractive index distribution and its corresponding AVP on the BGS in step-index,graded-index,and complex-index optical fibers. A new method has also been proposed to efficiently discriminate acoustic mode solution and obtain the new and full images of total Brillouin gain and acoustic modes number of the fiber as a function of the refractive index distribution, considering the influence of changing the refractive index difference and the geometric size simultaneously. For each type of optical fiber,the recommended parameter range is provided for optical fiber sensing and optical fiber communication. Moreover,the suitable optical fiber with close peak intensity in its multi-peak BGS is explored and achieved,which can be used in Brillouin beat spectrum detection systems to improve sensing accuracy.关键词
布里渊增益谱/光纤/声学模式/折射率/有限元分析Key words
Brillouin gain spectrum/optical fiber/acoustic mode/refractive index/finite element analysis(FEA)分类
数理科学引用本文复制引用
吉正源,路元刚,潘宇航,彭楗钦,张泽霖,王吉明..二氧化锗掺杂光纤中折射率分布对布里渊增益谱的影响[J].南京航空航天大学学报（英文版）,2021,38(5):769-787,19.基金项目
This work was supported by the Na?tional Natural Science Foundation of China(Nos.61875086,61377086),the Aerospace Science Foundation of China(No.2016ZD52042)and the Foundation of Graduate Innova?tion Center in Nanjing University of Aeronautics and Astro?nautics(No.kfjj20170801). （Nos.61875086,61377086）
