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采用严格的耦合理论,研究了长周期光纤光栅各层材料色散对双峰谐振效应的影响,指出芯层和包层材料色散必须同时考虑才能切实地符合实际情况.分析了材料色散对不同膜层参数下双峰谐振LPFG透射特性的影响,模拟计算了材料色散计及与否时的双峰谐振波长,两种情形下两峰偏差值分别约在1.5—2nm和6.5—7.5nm浮动.最后,讨论了材料色散对双峰LPFG传感器灵敏度的影响.结果表明,此类传感器对膜层折射率的分辩率高达10-8,计及材料色散后的等高线图可为传感器灵敏度设计提供精确的参数选择组合.
The strict coupling theory is used to study the effect of material dispersion on the bimodal resonance effect of long-period fiber gratings. It is pointed out that the dispersion of the core and cladding materials must be considered in order to effectively conform to the actual situation. Parameters of the bimodal resonance LPFG transmission characteristics of the simulation calculated the material dispersion and whether or not the bimodal resonance wavelength, the two cases of deviation between the two peaks were about 1.5-2nm and 6.5-7.5nm floating Finally, The effect of material dispersion on the sensitivity of bimodal LPFG sensors is discussed.The results show that the resolution of these sensors is up to 10-8, and the contour plots after material dispersion can provide accurate sensor sensitivity design Parameter selection combination.