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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。
In view of the fact that the femtosecond pulse with super energy density is difficult to transmit in the traditional optical fiber, a hollow single mode Bragg optical fiber for high power femtosecond pulse transmission is designed. Firstly, the material of hollow Bragg optical fiber was selected based on the photon band gap property of one-dimensional photonic crystal. Then, the optical fiber software FDTD Solutions was used to analyze the influence of various structural parameters on optical fiber mode. The transmission characteristics were also analyzed. Subsequently, it was further optimized by introducing a defect layer in the fiber cladding, effectively controlling the dispersion curve distribution of the fiber. Full-bandwidth scanning shows that the bandwidth of the single-mode transmission of the hollow Bragg optical fiber reaches 100 nm and fully meets the transmission requirement of 100 fs optical pulse.