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设计了一种双芯高双折射光子晶体光纤,采用多极法(multipolemethod)和光纤的模式耦合理论研究了光纤的双折射、耦合长度以及色散特性.数值研究发现,对于空气孔节距Λ=1.2μm,空气孔直径d=1.0μm的光纤,在1.55μm处双折射度为1.24×10-2;对应x偏振模的耦合长度为21.6μm,对应y偏振模的耦合长度为24.3μm.这种具有高保偏度和极短耦合长度的双芯光子晶体光纤对于微型光子器件的研制具有重要意义.
The birefringence, coupling length and dispersion characteristics of the fiber were studied by using the mode coupling theory of multipole method and the fiber. A numerical study shows that for the air-core pitch Λ = 1.2 μm and an air hole diameter d = 1.0 μm, the birefringence at 1.55 μm is 1.24 × 10 -2, the coupling length corresponding to the x-polarization mode is 21.6 μm, and the coupling length corresponding to the y-polarization mode is 24.3 μm. It is of great significance for the development of miniature photonic devices to fabricate dual-core photonic crystal fibers with high degree of preservability and very short coupling length.