【摘要】 为了研究长周期光纤光栅透射谱的温度特性,采用光纤3层模型进行了仿真研究,得出了1阶低次包层模与导模耦合时透射谱的变化规律。结果表明,在低温度范围内,其透射峰的深度基本不受温度的影响,不同谐振波长对应不同的温度灵敏性,次数越高灵敏度越高,K₇=0.04951nm/℃,K₃=0.04246nm/℃,但同一谐振波长对温度的响应具有良好的线性关系。更多还原

【Abstract】 In order to study temperature characteristics of the transmission spectra of long period fiber gratings,simulation was carried out based on the three-layer fiber model,and the change rule of transmission spectra was obtained in the case of coupling between lowest-order cladding modes and the fundamental core mode.It is shown that the depth of harmonic wave is almost independent of temperature within the low temperature range.Different harmonic wave has different temperature sensitivity,the bigger the order,the higher the temperature sensitivity,K₇=0.04951 nm/℃,K₃=0.04246nm/℃.But the response the same harmonic wave is linear with temperature.更多还原