长周期光纤光栅谐振波长与曝光量的变化关系

The relationship between the resonant wavelength of the long period fiber grating and its exposure

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 .

In this paper we have derived the Bragg equation of long-period fiber gratings by using interference theory. According to the color centers model and Kramers-Kronig principle, we have studied, theoretically and experimentally, the relationship between the resonant wavelength of the grating and its exposure. The result shows that the resonant wavelength of the long-period fiber grating changes with the UV exposure in the form of the sum of two decaying exponential functions and the rate of change is controlled by the duty ratio of the mask. The resonant wavelength of the long-period fiber grating is inversely proportional to the duty ratio of the mask.