级联长周期光纤光栅作为长周期光纤光栅的一个特殊形式,具有许多特殊性质。本文研究了级联长周期光纤光栅理论以及其光谱随级联光纤长度和光栅强度变化的特性,并与实验结果进行了比较,为级联长周期光纤光栅传感和设计级联长周期光纤光栅器件提供了依据。

As a special form of long period grating, there are so many special properties for the cascaded long-period grating. In this paper, the theory of the cascaded long-period grating is studied, and the spectral characteristic which is changed with the length of cascaded fiber and the grating intensity is discussed comparing with the experimental results. It is helpful for the design of sensors and components based on the cascaded long period fiber grating.