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利用波动干涉理论推导了长周期光纤光栅的光栅方程 .利用色心模型和Kramers_Kronig原理 ,得到了长周期光纤光栅的中心谐振波长与曝光量的变化关系的理论公式 ,并进行了实验研究 .理论和实验结果都表明 ,长周期光纤光栅的中心谐振波长与曝光量的关系按多项e负指数之和规律变化 ,其变化率受到模板占空比的控制 ;另外 ,长周期光纤光栅的中心谐振波长与模板占空比成反比关系 .
The grating equations of long-period fiber gratings are deduced by utilizing the theory of wave interference.The theoretical formula of the relationship between the central resonance wavelength and the exposure amount of long-period fiber gratings is obtained by using the color center model and Kramers-Kronig principle.The experimental results show that the theory and The experimental results show that the relationship between the central resonant wavelength and the exposure dose of long-period fiber gratings varies according to the law of the sum of multiple e-negative exponents and the rate of change is controlled by the duty cycle of the template. In addition, the central resonant wavelength of the long period fiber gratings And the template is inversely proportional to the duty cycle.