正弦形构造的光纤光栅自致啁啾效应

发布时间：2018-01-02 23:17

本文关键词：正弦形构造的光纤光栅自致啁啾效应　出处：《光谱学与光谱分析》2017年01期 　论文类型：期刊论文

【摘要】：结合均匀光栅在受到非均匀应变时会产生啁啾效应的原理,提出了一种利用正弦结构将均匀光栅调制成啁啾光栅的方法。设计了正弦结构的基底材料,将光纤光栅粘贴在基底材料的应变非均匀区,通过施加拉伸载荷将其产生的应变引入FBG栅区,使得FBG产生了啁啾效应,FBG被调制成具有多个反射峰和宽带宽的啁啾光栅;使用有限元软件对正弦结构拉伸载荷下的应变进行了仿真,得到了正弦结构不同位置的应变云图;实验结果在位移载荷最大为8mm时,得到了带宽增加5倍,反射谱具有多个反射峰的啁啾光栅;结合传输矩阵法对啁啾光栅的反射谱进行光谱仿真重构,仿真光谱与实验光谱趋势基本吻合。
[Abstract]:According to the principle that uniform grating will produce chirp effect when it is subjected to non-uniform strain, a method of modulating uniform grating into chirped grating by sine structure is proposed, and the substrate material with sine structure is designed. The fiber Bragg grating is pasted in the strain inhomogeneous region of the substrate material and the strain produced by the fiber grating is introduced into the FBG gate region by applying the tensile load, which makes the FBG chirp effect. The FBG is modulated to a chirped grating with a plurality of reflection peaks and a wide bandwidth. The strain of sinusoidal structure under tensile load is simulated by finite element software, and the strain cloud diagram of different position of sinusoidal structure is obtained. The experimental results show that when the maximum displacement load is 8 mm, a chirped grating with multiple reflection peaks and a 5 times bandwidth increase is obtained. The reflectance spectra of chirped gratings are reconstructed by using the transfer matrix method, and the simulated spectra are in good agreement with the experimental spectra.
【作者单位】：南京航空航天大学航空宇航学院机械结构力学及控制国家重点实验室;南京航空航天大学民航学院;
【基金】：国家自然科学基金青年科学基金项目(51405223,1150020529,11372132)资助
【分类号】：TN253
【正文快照】： 引言啁啾光纤光栅是一种折射率和栅格周期沿着轴向变化的光栅,由于体积小,损耗低,具有反射带宽较宽和稳定的色散,被广泛应用于光纤色散补偿和宽带滤波器[1]。目前,国内外学者对啁啾光栅制作研究主要为直接制作和间接制作,直接制作方法是利用相位掩膜板在光纤中直接写入啁啾[

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