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利用有限元法和局域耦合模理论对空芯光子带隙光纤成栅机理进行了分析。建立了空芯光子带隙光纤包层空气孔塌缩模型,分析计算了纤芯基模(LP01)和一阶包层模(LP11)在塌缩区域内有效折射率分布和耦合系数分布,得到了LP01和LP11耦合的传输谱。在此基础上研究了光纤结构参数(空气孔直径和孔间距)、光栅参数(光栅周期和周期个数)、塌缩程度和塌缩方式对谐振波长的影响。研究结果表明,随着空气孔直径的增大、孔间距的减小、光栅周期的增大和塌缩程度的减小,其谐振波长向短波方向发生漂移;随着周期个数的增大,其谐振波长未发生明显漂移;此外,与圆对称塌缩相比,非对称塌缩谐振波长向短波方向移动。
The forming mechanism of hollow photonic bandgap fiber is analyzed by finite element method and local coupled mode theory. The air core hole collapse model of hollow-core photonic band gap fiber cladding was established. The effective refractive index distribution and coupling coefficient distribution of the core-based (LP01) and first-order cladding modes (LP11) in the collapsed area were obtained. The transmission spectrum coupled by LP01 and LP11. On this basis, the effects of fiber structure parameters (air hole diameter and hole spacing), grating parameters (grating period and number of cycles), degree of collapse and collapse mode on the resonant wavelength were studied. The results show that with the increase of the diameter of the air hole, the decrease of the hole spacing, the increase of the grating period and the decrease of the collapse degree, the resonance wavelength shifts to the shortwave direction. With the increase of the number of cycles, Resonant wavelength does not occur significant drift; In addition, compared with the circular symmetric collapse, the asymmetric collapse resonant wavelength to shortwave direction.