本文選題：全光纖干涉儀 + 有效折射率�。� 參考：《物理學報》2017年22期

【摘要】：全光纖干涉式傳感結構中包層模場與外界物理量作用,攜帶被感測信息,因此對包層模的研究是設計制作和提高該類傳感器傳感性能的關鍵.利用有限差分光束傳播法獲得傳感光纖不同長度和不同芯徑比時傳感器對應的光譜,通過傅里葉變換獲得其干涉頻譜,計算出各主要參與干涉的包層模組的有效折射率,利用色散方程確定對應包層模.理論仿真結果顯示,隨著傳感部分光纖長度增加,參與干涉的包層模式隨之增加,并且向高階模式變化,光譜變得稠密,是多階包層模干涉的疊加,傳感器輸出干涉譜的自由光譜范圍變小.隨著輸入光纖與傳感光纖芯徑比變化,會明顯改變纖芯包層功率分布,同時,芯徑比增大也會增加參與干涉的包層模種類和階數(shù).
[Abstract]:The cladding mode field acts with external physical quantities and carries sensing information in all-fiber interferometric sensing structure, so the research of cladding mode is the key to design and manufacture and improve the sensing performance of this kind of sensor. By using the finite difference beam propagation method, the spectrum of the sensor with different length and core diameter ratio is obtained. The interference spectrum is obtained by Fourier transform, and the effective refractive index of the cladding module which is mainly involved in the interference is calculated. The corresponding cladding modes are determined by dispersion equation. The theoretical simulation results show that with the length of the sensing fiber increasing, the cladding mode involved in the interference increases, and changes to the higher-order mode, the spectrum becomes dense, which is the superposition of the multi-order cladding mode interference. The free spectrum range of the sensor output interference spectrum is reduced. With the change of core diameter ratio between input fiber and sensor fiber, the power distribution of the core cladding will be changed obviously. Meanwhile, the increase of core diameter ratio will also increase the type and order of the cladding modes involved in the interference.
【作者單位】： 山東科技大學 電子通信與物理學院;山東科技大學 電氣與自動化工程學院;山東科技大學 礦山災害預防控制省部共建國家重點實驗室培育基地;
【基金】：中國博士后特別資助項目(批準號:200902574) 中國博士后面上資助項目(批準號:20080441150) 山東省自然基金(批準號:ZR2009AM017,ZR2013FM019) 山東省教育廳(批準號:J06P14) 青島開發(fā)區(qū)(批準號:2007-2-39) 礦山災害預防控制省部共建國家重點實驗室培育基地開放基金(批準號:MDPC201602)資助的課題~~
【分類號】：TP212

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