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利用傅里叶变换的方法 ,对超结构光纤光栅的谱特性进行了分析 ,将其结论与耦合模理论的结果进行了比较和研究 ,在反射率较低时两者得到了很多一致的结论。经推导发现 ,取样光纤光栅的反射峰间隔Δλ不只和光栅周期 p有关 ,而且与取样率T 关系密切。该结论在实验上得到了证实
The spectral characteristics of the superfine fiber gratings were analyzed by using the Fourier transform method. The conclusion and the results of coupled mode theory were compared and studied. At the low reflectivity, the two obtained a lot of consistent conclusions. It is found that the reflection peak interval Δλ of the sampled FBG is not only related to the grating period p, but also closely related to the sampling rate T. This conclusion has been experimentally confirmed