用阶跃有效折射率模型研究光子晶体光纤色散特性

在采用阶跃有效折射率模型研究光子晶体光纤的可行性方面，提出了将普通单模光纤、色散位移光纤、色散平坦光纤作为一定极限条件下的折射率引导型光子晶体光纤特例的观点.通过编程计算，并与文献报道的实验数据对比，表明应用本模型可以揭示光子晶体光纤所具有的奇异的色散机理.特别是应用本模型具有更快的计算速度.还用本模型分析了空气孔直径、周期及芯径对色散特性的影响. 关键词： 折射率引导型光子晶体光纤 阶跃有效折射率模型 色散

Studies on the dispersion in photonic crystal fiber using the step effective index model

As a precondition , it was presented that the single_mode optical fiber , the dispersion_shift optical fiber and the dispersion_flatten optical fiber can be regarded as the special examples of the index_guiding photonic crystal fiber(PCF) under a determinate condition, when the new step effective index model （SEIM） was used to discuss the chromatic dispersion properties of PCF. The result compared with the experimental data reported in the literature indicated that such a SEIM can be used to uncover more interesting dispersion regimes in PCFs. In particular, the speed of calculation by using the SEIM is very quick. Finally, the dispersion characteristics of the PCF with different air hole diameter d, air hole pitch Λ and the core radius a were also discussed.