基于热极化光纤设计了电调谐光纤布拉格光栅。通过光纤热极化二维载流子模型分析了热极化致内建电场的形成。结合紫外光在热极化光纤二阶非线性周期性擦除以及在光纤光栅制作中的作用, 设计了周期性极化的布拉格光纤光栅。研究结果表明, 利用非线性擦除区域与非线性区域电致折射率改变的不同, 调节光栅的折射率差, 可以实现电调谐光纤光栅。针对电调谐光纤光栅, 研究了一定电压下初始折射率差、光栅长度对反射率的影响。文中结论对于光纤光栅在全光纤器件方面的应用具有重要参考价值。

An electrically tunable fiber Bragg grating based on thermally poled twin-hole fiber is designed. The formation of frozen-in electric field during thermal poling is analyzed based on the two-dimensional charge dynamics model. A periodically poled Bragg fiber grating is designed based on the role of ultraviolet light in the second-order nonlinearity (SON) periodically erasing of thermally poled fiber and the fiber grating manufacturing. The tunability is achieved as the variation responses of refractive indices to modulating voltage in SON erased zone and SON zone are different. The influence of the initial refractive index and the length of the grating on the tunability are also investigated. The electrically tunable thermally poled fiber Bragg grating has important reference value for the application of fiber Bragg grating and thermally poled optical fiber in active optical devices.