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对光纤布拉格光栅(FBG)法布里-珀罗(F-P)腔的透射特性进行了深入分析,指出了FBGF-P腔透射谱中纵模位置的影响因素,讨论了与普通F-P腔的联系和区别.应用光栅的有效镜面模型对FBG反射主瓣内反射系数的相位因子进行线性模拟,定义了FBG有效长度的概念并得出其表达式.提出将FBG的有效长度纳入到FBGF-P腔的等效腔长中,用等效腔长来计算FBGF-P腔中的纵模间隔.数值仿真和实验结果都表明,用等效腔长计算所得的纵模间隔与实际的FBGF-P腔中的纵模间隔符合很好,误差极小.
The transmission characteristics of Fabry-Perot (FPG) cavity in fiber Bragg grating (FBG) are analyzed in detail. The influencing factors of the longitudinal mode position in FBG-P cavity transmission spectrum are pointed out. The relations with the ordinary FP cavity and The effective mirror model of grating is used to linearly simulate the phase factor of the reflection coefficient in the main lobe of FBG and the definition of the effective length of FBG is derived and its expression is given.The effective length of FBG is proposed to be included in the FBGF-P cavity In the equivalent cavity length, the longitudinal cavity spacing in the FBGF-P cavity is calculated using the equivalent cavity length.The numerical simulation and experimental results show that the longitudinal cavity spacing calculated from the equivalent cavity length and the actual FBGF-P cavity The longitudinal mode spacing is in good agreement with minimal error.