We report modeling that demonstrates the reduction of transmission loss and broadening of the bandwidth of a conventional hollow-core photonic bandgap fiber (PBF). Numerical investigation reveals that transmission loss of the high-order ${\mathrm{TE}}_{01}$ mode is lower than that of the fundamental ${\mathrm{HE}}_{11}$ mode in fibers with thick cladding walls. By comparing dispersion curves of PBFs with different core-wall thicknesses, we show that the ${\mathrm{TE}}_{01}$ mode has weaker coupling strength to a surface mode than the ${\mathrm{HE}}_{11}$ mode. This result opens the way for a wider transmission band and lower transmission loss in PBFs that are subject to the detrimental effects of surface modes.

中文翻译：

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常规光子带隙光纤在TE ₀₁模式下的独特损耗特性

我们报告的建模证明了传输损耗的减少和传统中空光子带隙光纤（PBF）带宽的扩大。数值研究表明，高阶传输损耗${\mathrm{TE}}_{01}$ 模式低于基本模式 ${他}_{11}$具有厚包层壁的光纤中的模态。通过比较不同芯壁厚​​度的PBF的色散曲线，我们发现${\mathrm{TE}}_{01}$ 模态与表面模态的耦合强度比表面模态弱 ${他}_{11}$模式。这一结果为在受表面模式有害影响的PBF中实现更宽的传输频带和更低的传输损耗开辟了道路。