光子晶体光纤结构参量对模场分布的影响

发布时间：2018-01-15 14:11

本文关键词：光子晶体光纤结构参量对模场分布的影响　出处：《激光与光电子学进展》2017年10期 　论文类型：期刊论文

【摘要】：利用全矢量有限元法分析了光子晶体光纤(PCF)的结构参量对其本征模场分布的影响。数值计算结果表明,具有多层空气孔、多层纤芯、大孔间距和大占空比的结构更有利于将光场约束在纤芯中,纤芯层数、孔间距和占空比的增加均会导致PCF本征模场出现更高阶次的模式。纤芯层数和孔间距的增加会对由占空比减小所引起的功率泄漏进行一定的补偿,通过减小空气占空比、增加纤芯层数和孔间距,可实现大模场单模传输的可行性。对于4层空气孔、2层纤芯、占空比为0.01、孔间距为20μm的PCF,在保证单模传输的条件下,纤芯半径可达40μm,有效模面积为3717μm2,纤芯功率集中度为68.32%。
[Abstract]:The effect of structure parameters of photonic crystal fiber (PCF) on the intrinsic mode field distribution of PCF is analyzed by using full vector finite element method. The numerical results show that there are multi-layer air holes and multi-layer core. The structure of large hole spacing and large duty cycle is more favorable to the confinement of light field in the core and the number of core layers. The increase of hole spacing and duty cycle will lead to a higher order mode of PCF intrinsic mode field, and the increase of core layer number and hole spacing will compensate the power leakage caused by the decrease of duty cycle. By reducing the air duty cycle, increasing the number of core layers and hole spacing, the feasibility of large mode field single mode transmission can be realized. For four layers of air holes, the duty cycle is 0.01. When the hole spacing is 20 渭 m, the core radius can reach 40 渭 m, the effective mode area is 3717 渭 m ~ 2, and the core power concentration is 68.32.
【作者单位】：中国工程物理研究院激光聚变研究中心;中国工程物理研究院研究生院;
【基金】：国家自然科学基金(61475145)
【分类号】：TN253
【正文快照】： 100607-1与传统高功率激光器相比,高功率光纤激光器在光束质量、输出功率、转化效率、稳定性和使用灵活性等方面更占优势,目前高功率光纤激光器已在工业加工与制造、科学研究及国防等方面得到广泛应用。实现光纤激光器更高功率输出的基本途径是提高单纤输出能力,而阶跃型单模

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