作　　者： ; ; ; ; ;

机构地区： 中山大学物理科学与工程技术学院光电材料与技术国家重点实验室

出　　处： 《红外与激光工程》 2007年第6期906-909,共4页

摘　　要： 介绍了利用非对称光纤Fabry-Préot(F-P)腔作为边沿滤波器的光纤光栅波长移位检测方案。基于薄膜干涉理论对该非对称F-P腔的反射率响应关系进行计算与分析,得出该F-P腔的结构参数,改善了普通F-P腔的反射特性,具有线性范围宽和线性度好的优点。利用该F-P腔的某一线性滤波边缘,将传感光栅的波长信息转化为功率信息进行检测,可完成光纤光栅的传感波长解调。采用该检测方案进行了光纤光栅应变传感实验,实现了在7 nm范围内的波长线性解调,测量波长分辨率为0.01nm。 The detection scheme of fiber grating wavelength shift is presented, where an asymmetric fiber Fabry-Perot （F-P） cavity is used as an edge-filter. Based on the interference theory of thin film, the reflectance response of the asymmetric F-P cavity is calculated and analyzed. And its optimal parameters have been obtained. The cavity improves the reflective response of common F-P cavities and possesses the advantages of wide dynamic range and good hnearity. By use of one edge of the F-P cavity linear filter, the wavelength shift of the sensing FBG is converted into light intensity variation which can be detected. So the sensing wavelength demodulation of fiber gratings is implemented. Experiment on the FBG strain sensor according to this detection scheme demonstrates that its wavelength range of linear demodulation and wavelength resolution of measurement are 7 nm and 0.01 nm respectively.

关 键 词： 光纤光栅 解调 腔

领　　域： [电子电信]