研究了一种基于聚合物太赫兹光纤的太赫兹光纤布喇格光栅.通过二氧化碳激光器或紫外激光器点对点加工聚合物太赫兹光纤, 实现聚合物太赫兹光纤直径的周期性调制, 从而实现太赫兹光纤布喇格光栅的周期性折射率调制.基于有限元方法和光纤布喇格光栅相关理论, 考虑反射峰波长、反射率、带宽、光纤长度、光纤直径和光纤直径形状变化程度等因素,研究了太赫兹光纤布喇格光栅的特性.理论模拟表明, 反射峰波长和光栅周期存在与传统光学波段光纤布喇格光栅不同的非线性关系.

A novel THz fiber Bragg grating based on a polymer THz fiber filter was proposed and investigated The periodic index modulation of the THz fiber Bragg grating was introduced by the periodic diameter modulation of the polymer THz fiber by using a carbon dioxide laser or an ultraviolet laser to process the polymer THz fiber point by point. Based on the finite element method and fiber Bragg grating theory, the properties of the proposed THz fiber Bragg grating are well investigated considering the peak wavelength, reflectivity, bandwidth, length of the THz fiber Bragg grating and also the diameter and the degree of diameter deformation of the polymer THz fiber. The simulation results show that nonlinear relationship between the peak wavelength (reflectivity) and the grating pitch of the THz fiber Bragg grating is quite different from the conventional optical fiber Bragg grating.