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提出了一种包层周期呈线性啁啾分布的新型空心布拉格光纤(HC-BF)包层结构设计,旨在满足基于中红外吸收光谱的多组分痕量气体检测应用需求。数值研究了这种准周期包层结构HC-BF中近掠入射条件下TE和TM模的带隙结构和模式损耗特性,并与常规周期包层结构HC-BF进行了对比。结果表明,对于包层周期线性啁啾分布结构的HC-BF,通过增大包层周期线性增加量和包层层数均可以有效拓展光子带隙(PBG)宽度,并且其展宽效果随两者增加而明显增强,同时PBG中心波长产生红移。在展宽的PBG波长范围内,该新型包层结构HC-BF依然能够保持0.01dB/m量级的低传输损耗,表明其具有优良的中红外宽带低损耗传输特性。
A new type of hollow fiber Bragg fiber (HC-BF) cladding structure with linear chirp distribution is proposed to meet the needs of multi-component trace gas detection based on mid-infrared absorption spectroscopy. The bandgap structure and mode loss characteristics of TE and TM modes in this quasi-periodic cladding HC-BF were numerically studied and compared with the conventional periodic cladding HC-BF. The results show that for the HC-BF with a periodic linearly chirped cladding structure, the photonic band gap (PBG) width can be effectively broadened by increasing the linear increase of cladding period and the number of cladding layers, and its broadening effect increases with both Increase and significantly enhanced, while PBG center wavelength redshift. In the broadened PBG wavelength range, the new cladding HC-BF still maintains a low transmission loss on the order of 0.01 dB / m, indicating its excellent mid-infrared broadband low-loss transmission.