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通过理论分析和数值模拟,研究了一种基于光子晶体光纤(PCF)模间干涉的干涉计的灵敏度.根据光纤模间干涉理论,结合光子晶体光纤的归一化频率,分析了PCF干涉计测量气体折射率的原理,得到一个可以衡量PCF干涉计灵敏度的参数δns.通过对该参数物理意义的分析可以得出,PCF纤芯附近第一层气孔对灵敏度影响最大.相比于常规气孔结构,把PCF第一层气孔变为面积更大的圆与椭圆复合孔,可显著提高传感灵敏度.
By means of theoretical analysis and numerical simulation, the sensitivity of an interferometer based on PCF inter-mode interference was studied.According to the theory of inter-fiber interference and the normalized frequency of photonic crystal fiber, the PCF interferometer measurement Gas refractive index, we get a parameter δns that can measure the sensitivity of PCF interferometer. By analyzing the physical meaning of this parameter, it can be concluded that the first stratosphere near the PCF core has the greatest influence on sensitivity. Compared with the conventional stomatal structure, The first layer of PCF pores into a larger area of the circle and ellipse composite hole, can significantly improve the sensitivity of the sensor.