运用模式理论研究分析了单模光纤法布里-珀罗传感器(EFPI)在白光条件下的输出干涉谱,理论推导出反射光干涉光谱的归一化函数表达式,分析得到输出干涉谱受法布里-珀罗腔的腔长和耦合系数的相位变化的共同影响,并与传统几何光学的方法相比较。通过计算机仿真,可以清晰看出各参数与输出干涉谱的关系。其研究结论为高精度和高准确度的法布里-珀罗系统的实现提供了更为精确的理论基础。 The output interference spectrum of single-mode fiber Fabry-Perot sensor (EFPI) under white light condition is analyzed and studied by the mode theory. The normalized expression of the interference spectrum of the reflected light is derived theoretically, and the output interference spectrum is analyzed by the method The length of the Buried-Perot cavity and the phase change of the coupling coefficient, and compared with the traditional method of geometrical optics. Through computer simulation, we can clearly see the relationship between the parameters and the output interference spectrum. The conclusion of the research provides a more accurate theoretical basis for the realization of the Fabry-Perot system with high precision and high accuracy.