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光子晶体光纤由于其灵活可调的色散特性用作色散补偿具有极大的应用潜力.设计了一种色散补偿光子晶体光纤,并运用频域有限差分法模拟了其色散特性,从理论上分析了其结构参数孔间距Λ和空气占空比d/Λ对该光子晶体光纤的色散系数的影响,并且实际制备出了3种不同结构参数的光子晶体光纤.通过对其色散曲线对比分析表明:当光子晶体光纤孔间距在1μm附近时,其色散系数随着孔间距Λ和占空比d/Λ的增大而增加,但对于孔间距Λ的变化比占空比d/Λ更为敏感,并且随着孔间距Λ的增加,其对色散系数的影响能力逐渐减小.设计并制备的光子晶体光纤在1550nm处的色散系数为-241.5ps·nm-1·km-1,相对色散斜率为0.0018,具有较好的色散补偿能力.
Photonic crystal fiber has great potential for dispersion compensation because of its flexible and adjustable dispersion characteristics. A dispersion compensated photonic crystal fiber is designed and its dispersion characteristics are simulated by the finite difference method in frequency domain. Its structure parameter hole spacing Λ and air duty cycle d / Λ on the chromatic dispersion coefficient of the photonic crystal fiber, and actually prepared three kinds of photonic crystal fibers with different structural parameters.Comparison of the dispersion curves shows that when When the photonic crystal fiber pitch is about 1μm, the dispersion coefficient increases with the increase of the hole spacing Λ and the duty cycle d / Λ, but it is more sensitive to the change of the hole spacing Λ than the duty cycle d / Λ. With the increase of the hole spacing Λ, its influence on the dispersion coefficient decreases gradually. The designed and prepared photonic crystal fiber has a dispersion coefficient of -241.5ps · nm-1 · km-1 at 1550nm and a relative dispersion slope of 0.0018 , With better dispersion compensation capability.