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为了使光子晶体光纤(PCF)在钛宝石飞秒激光器的工作波长0.80μm和光通信窗口1.55μm处获得宽的近零超平坦色散,使用了三包层六角空气孔环结构设计来代替普通的单包层结构。应用了改进的有效折射率法对该三包层PCF进行了数值模拟。结果表明:三包层PCF的色散随结构参数的微小变化而有较大的变化,因此通过对PCF结构参数的合理调节,分别实现了在0.80±0.02μm和1.55±0.15μm波长范围内近零、平坦色散(色散范围±0.5 ps/(km·nm),色散斜率范围±0.02 ps/(km·nm2)的结构设计。这对于光通信系统及研究飞秒激光在PCF中的传输特性,拓展飞秒激光的研究和应用都具有重要意义。
In order to make the photonic crystal fiber (PCF) have a wide near-zero ultra-flat dispersion at a working wavelength of 0.80μm and an optical communication window of 1.55μm for a Ti: Fe-b laser, a triple-clad hexagonal air-ring structure design was used instead of the conventional single Cladding structure. An improved effective refractive index method was used to simulate the three-layer PCF. The results show that the dispersion of PCF has a great change with the small change of the structure parameters. Therefore, by adjusting the PCF structure parameters, the dispersion of PCF in the range of 0.80 ± 0.02μm and 1.55 ± 0.15μm is achieved respectively. , Flat dispersion (dispersion range ± 0.5 ps / (km · nm), dispersion slope ± 0.02 ps / (km · nm2) structure design.) This is for optical communication systems and research femtosecond laser transmission characteristics in the PCF, expand Femtosecond laser research and application are of great significance.