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提出一种双锥型光纤光栅(FBG),利用传输矩阵方法分析了其渐变光栅区长度和形状对光栅反射谱的影响规律。研究表明:随着渐变光栅区长度的增大,两主峰中间的次级峰幅值按不同比例增大,中间部分比例大,两侧比例小。当渐变光栅区长度增大1个数量级后,中间次峰有明显的交联趋势,随着长度进一步增大,中间次峰完全连接在一起,并与两个主峰等幅变化;渐变光栅区为线性和指数两种形状时,双锥型FBG光谱分布几乎相同,而当渐变光栅区为抛物线形状时,各次级峰右移至右侧主峰两侧,且幅度以主峰为中心逐渐降低。利用实验初步验证了理论分析的正确性。
A double-tapered fiber grating (FBG) is proposed. The transmission matrix method is used to analyze the influence of the length and shape of the graded grating on the grating reflection spectrum. The results show that with the increase of the length of the gratings, the amplitudes of the secondary peaks in the middle of the two main peaks increase in different proportions, with a large proportion in the middle part and a small proportion on both sides. When the length of the graded grating increases by one order of magnitude, the secondary peak has a significant tendency of cross-linking. As the length further increases, the secondary sub-peaks are completely connected and change in constant amplitude with the two main peaks. The graded grating area is In the case of linear and exponential shapes, the spectral distributions of double-tapered FBGs are almost the same. When the graded grating region is parabolic, the secondary peaks shift to the right of both sides of the main peak, and the amplitude gradually decreases around the main peak. The experimental results verify the correctness of the theoretical analysis.