半导体光电, 2018, 39 (3): 369, 网络出版: 2018-06-29
基于光子带隙中模式截止特性的单模传输研究
SingleMode Propagation Based on The Mode Cuttingoff Characteristics Within The Photonic Bandgap
空芯光子带隙光纤 有限元法 空间光谱分析成像 高阶模式 单模传输 hollowcore photonic bandgap fiber finite element method spatially and spectrally resolved imaging highorder mode singlemode propagation
摘要
空芯光子带隙光纤拥有优越的环境适应性, 但光纤中的高阶模使其在多种场合下的应用受到制约。利用光子带隙内高阶模式在小于截止波长时被强烈抑制, 而基模在该波段可以稳定存在的特性, 提出了实现单模传输的方法, 并通过实验验证了该方法的可行性。在此基础上仿真分析了包层参数对单模传输波段的影响, 计算结果表明, 单模传输波段的带宽随材料折射率的增加而增加, 折射率由1.445提高到2时, 带宽增加2.9倍; 相对倒角由0.2提高到0.8时, 单模传输波段的工作波长移动310nm以上。
Abstract
Hollowcore photonic bandgap fiber (HCPBF) has excellent environment adaptability, but highorder modes (HOMs) in HCPBF limit its applications in many areas. A method for singlemode propagation is proposed, which is based on the phenomenon that the HOMs are seriously suppressed and the fundamental modes stably exist when the operating wavelength is less than the cutoff wavelength. The method is experimentally verified. The influence of HCPBF cladding structure parameters on the bandwidth and operating wavelength for singlemode operation is simulated. The results show that the singlemode bandwidth is broadened by ~2.9 times when the index increases from 1.445 to 2, and singlemode operating wavelength can move ~310nm when the ratio between fillet diameter and hole diameter increases from 0.2 to 0.8.
徐小斌, 李金恒, 宋凝芳, 高福宇, 张智昊. 基于光子带隙中模式截止特性的单模传输研究[J]. 半导体光电, 2018, 39(3): 369. XU Xiaobin, LI Jinheng, SONG Ningfang, GAO Fuyu, ZHANG Zhihao. SingleMode Propagation Based on The Mode Cuttingoff Characteristics Within The Photonic Bandgap[J]. Semiconductor Optoelectronics, 2018, 39(3): 369.