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提出了一种新型的混合双包层结构的光子晶体光纤。利用多极法对光纤基模的模场分布、双折射、限制损耗及色散特性等进行了数值模拟,通过调节包层空气孔的孔径大小可以有效地控制光纤的双折射和限制损耗特性。结果发现:新设计的光纤具有高双折射低限制损耗特性,光纤结构参数为Λ=1.0μm,d1=d2=d3=0.8μm时,该光纤在C波段(1.53~1.565μm)及L波段(1.57~1.62μm)呈现负色散及负色散斜率。在波长为1.55μm处,双折射高达10-2,限制损耗小于10-5dB/m。
A new type of hybrid double-clad photonic crystal fiber is proposed. The mode field distribution, birefringence, limiting loss and dispersion characteristics of the optical fiber were numerically simulated by multipole method. The birefringence and limiting loss characteristics of the fiber can be effectively controlled by adjusting the aperture of the cladding air hole. The results show that the new designed fiber has the characteristics of high birefringence and low limit loss. When the optical fiber structure parameters are Λ = 1.0μm and d1 = d2 = d3 = 0.8μm, 1.57 ~ 1.62μm) showed negative dispersion and negative dispersion slope. At a wavelength of 1.55 μm, the birefringence is as high as 10 -2 and the limiting loss is less than 10 -5 dB / m.