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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 fiber grating wavelength shift detection scheme using asymmetric fiber Fabry-Préot (F-P) cavity as the edge filter is introduced. Based on the theory of thin film interference, the reflectivity response of the asymmetric F-P cavity is calculated and analyzed. The structural parameters of the F-P cavity are obtained and the reflectivity of the ordinary F-P cavity is improved. The F-P cavity has the advantages of wide linear range and good linearity. By using a certain linear filtering edge of the F-P cavity, the wavelength information of the sensing grating is transformed into the power information for detection, and the sensing wavelength demodulation of the fiber grating can be completed. A fiber grating strain sensing experiment was carried out by this scheme, which realized the linear demodulation of the wavelength in the range of 7 nm with the wavelength resolution of 0.01 nm.