针对超强能量密度的飞秒脉冲很难在传统光纤中传输的情况, 设计了一款用于高功率飞秒脉冲传输的空心单模Bragg光纤。首先基于一维光子晶体的光子禁带特性选择了制作空心Bragg光纤的材料, 接着利用光学软件FDTD Solutions分析了光纤各结构参数对光纤模式的影响, 并对传输特性进行了分析。随后, 通过在光纤包层中引入缺陷层的方法对其进行了进一步的优化, 有效调控了该款光纤的色散曲线分布。经全带宽扫描可知, 该款空心Bragg光纤单模传输的带宽达100 nm, 完全满足了100 fs光脉冲的传输要求。

It is very difficult to transmit femtosecond pulses with high energy density in traditional optical fiber. So, a hollow single-mode Bragg fiber was designed. First, the cladding of hollow Bragg fiber was prepared based on one-dimensional photonic crystal′s bandgap characteristics. Then, the fiber structure parameters and transmission properties were analyzed by using the optical software FDTD Solutions. And then, the structure parameters were optimized to control dispersion curves through bringing in defect layer in cladding layer. It can be seen by full bandwidth scanning that the fundamental mode bandwidth achieve around 100 nm which can transmit 100 fs optical pulses.