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综合运用弯曲光纤的等效直光纤模型、全矢量频域有限差分法及各向异性完全匹配层吸收边界,计算了两种类型(折射率引导型和带隙型)光子晶体光纤(PCF)的弯曲损耗。通过数值模拟弯曲损耗随弯曲半径的变化关系,证实了两种光子晶体光纤均具有弯曲损耗振荡特性。进而分析了两种光子晶体光纤弯曲损耗振荡的产生机理并给出了与损耗峰对应的包层模式。结果表明,振荡的产生源于基模与包层模式的耦合,其中,折射率引导型光子晶体光纤的弯曲损耗振荡机理类似于传统双包层光纤,带隙型光子晶体光纤弯曲损耗振荡的产生则是两种不同类型的包层模式共同作用的结果。
By using the equivalent straight fiber model of bent fiber, the full-vector finite-difference method in frequency domain and the absorption boundary of the perfectly matched layer of anisotropy, two kinds of PCF (refractive index guided and band gap) photonic crystal fibers Bending loss. By numerical simulation of the relationship between bending loss and bending radius, it is confirmed that both photonic crystal fibers have bending loss oscillation characteristics. Then the mechanism of bending loss oscillation of two photonic crystal fibers is analyzed and the cladding mode corresponding to the loss peak is given. The results show that the oscillation originates from the coupling of the fundamental mode and the cladding mode. The bending loss oscillating mechanism of the index-guided photonic crystal fiber is similar to that of the traditional double-clad fiber and the band gap photonic crystal fiber Is the result of two different types of cladding modes working together.