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基于超格子构造法,采用全矢量模型计算了光子晶体光纤的模场半径,由此出发理论分析了光子晶体光纤与普通单模光纤之间接续损耗分别受横向偏移、轴向倾斜以及模场不匹配的影响,给出了光子晶体光纤在部分常用结构参量区域{Λ,d/Λ}内与SMF-28接续损耗的理论值,讨论了光子晶体光纤各结构参量与接续损耗之间的关系。并简要分析了不同结构光子晶体光纤之间的接续损耗。结果表明,接续损耗对横向偏移和轴向倾斜都非常敏感;孔距是决定接续损耗大小最主要的因素;与普通单模光纤接续,当光子晶体光纤的孔距比该单模光纤纤芯半径大一些时,接续损耗比较小;两种不同结构光子晶体光纤之间的接续损耗大小最主要取决于它们孔距的差异。
Based on the supergrid construction method, the full-field model was used to calculate the mode field radius of photonic crystal fiber. Based on this, the theoretical analysis was made on the relationship between the splitting loss of photonic crystal fiber and that of ordinary single-mode fiber by transverse offset, axial tilt and mode field The theoretical values of the splice loss of SMF-28 in some commonly used structural parametric regions {Λ, d / Λ} are given. The relationships between the structural parameters and the splice loss of photonic crystal fibers are discussed . The splice losses between different structured photonic crystal fibers are analyzed briefly. The results show that the splice loss is very sensitive to lateral offset and axial tilt. Pitch is the most important factor that determines the splice loss. Compared with the single mode fiber, When the radius is larger, the splice loss is smaller. The splice loss between two different photonic crystal fibers depends on the difference of their pitch.