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运用耦合模理论推导了双光纤布拉格光栅的透射率和反射率的解析表达式,利用相关表达式计算和分析了双光纤布拉格光栅的反射特性,并与单光纤布拉格光栅作了比较。讨论了双光纤布拉格光栅反射特性与光栅间距、光栅长度和折射率微扰最大值之间的关系,为双光纤布拉格光栅波长锁定器的设计与制备提供了理论依据。最终获得双光纤布拉格光栅的结构和特性参数,并与实测的数据进行比较,结果表明两者较为一致。
The analytical expressions of transmittance and reflectance of dual fiber Bragg gratings are deduced by means of the coupled mode theory. The reflection properties of the dual fiber Bragg gratings are calculated and analyzed by using the correlation expressions, and compared with single fiber Bragg gratings. The relationship between the reflection properties of two fiber Bragg gratings and the maximum grating pitch, grating length and refractive index perturbation is discussed, which provides a theoretical basis for the design and preparation of the dual fiber Bragg grating wavelength locker. Finally, the structure and characteristic parameters of the dual fiber Bragg grating are obtained and compared with the measured data, the results show that the two are more consistent.