矩形取样Bragg光纤光栅研究

STUDY ON THE THEORY OF SAMPLED FIBER BRAGG GRATING

利用傅立叶变换的方法 ,对矩形取样 Bragg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的结论是一致的 .另外 ,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 .

The spectral property of sampled fiber gratingwas analyzed with Fourier transposition. It's conclusion was then compared with the result gotten form the deduction with coupled mode theory. The two outcomes were unified with each other when reflective ratio was low enough. Furthermore, we found that the interval Δλ between two reflective peaks of sample fiber grating was related not only to the period p of grating, but also closely to sampling rate T. The result has already been proved by experiment.