色散平坦光子晶体光纤色散和非线性特性研究

Dispersion and nonlinear property in dispersion flattened photonic crystal fiber

采用矢量波束传播法(BPM)对不同结构参量的光子晶体光纤的色散和非线性特性进行数值分析,计算色散平坦光子晶体光纤的参量色散系数D,有效模场面积A_(eff)和非线性系数γ。分析D,γ与色散平坦光子晶体光纤结构参量空气孔间距Λ、空气孔直径d之间的关系。分析结果表明,调节色散平坦光子晶体光纤的结构参量可以灵活地调整色散和非线性特性。得到的色散平坦光子晶体光纤在1300～1600 nm波长范围内,色散值仅在-1.5 ps·km^(-1)·nm^(-1)左右,非线性系数都大于19 W^(-1)·km^(-1)。

The dispersion and nonlinear property of dispersion flattened photonic crystal fibers（PCF） with different structural parameters were numerically analyzed using beam propagation method. Dispersion coefficient D, effective mode area Aeff and nonlinear coefficient were calculated. The relationship betwecn D, γand pitch A, hole diameter d was analyzed. The results indicate that dispersion and nonlinear property of dispersion flattened photonic crystal fiber can be controlled by the structural parameters A, d. In the range from 1300 nm to 1600 nm, PCF＇s dispersion achives about -1.5 ps·km^-1·nm^-1, and non-linear cofficient is above 19 W^-1·km^-1.