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提出了采用遗传算法(GA)结合传输矩阵法从需要的时延特性对光纤光栅进行参数重构的方法。该方法以时延为目标函数,由光纤光栅参数,包括光栅长度、折射率调制、光栅周期和光栅啁啾,组成种群中的待优化的个体,经过若干代遗传得到最优结果。用实值编码遗传算法实现了对均匀光纤光栅、啁啾光纤光栅和切趾啁啾光纤光栅参数的重构。数值仿真结果表明该方法对光纤光栅的时延特性参数重构十分有效。由斜率为100ps/nm,最大时延为300ps,中心波长为1555.2nm的理想线性时延特性重构出切趾啁啾光纤光栅的参数。此方法可以有效地从时延信息中提取光纤光栅参数,能够应用在利用光纤光栅时延特性的光控相控阵天线设计中。
A genetic algorithm (GA) combined with transfer matrix method was proposed to reconstruct the parameters of fiber gratings from the desired delay characteristics. This method takes the time delay as the objective function and obtains the optimal result after several generations of inheritance from the parameters of the fiber grating, including grating length, refractive index modulation, grating period and grating chirp, which are to be optimized in the population. The reconstruction of uniform fiber grating, chirped fiber grating and apodization chirped fiber grating parameters is realized by real-coded genetic algorithm. Numerical simulation results show that the proposed method is very effective for the reconstruction of time-delay parameters of fiber gratings. The parameters of the apodised chirped fiber gratings are reconstructed from the ideal linear delay with a slope of 100 ps / nm, a maximum delay of 300 ps and a center wavelength of 1555.2 nm. This method can effectively extract the parameters of the fiber grating from the time delay information and can be applied to the design of the light-controlled phased array antenna utilizing the time-delay characteristics of the fiber grating.