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光子晶体光纤具备的无截止单模、模场面积可调和色散可控的特性,使其在超连续谱的产生中具有独特的优势。超连续谱的产生条件之一,是所使用的光纤须具有高的非线性,而硫系玻璃非线性系数极高,因此利用硫系玻璃光子晶体光纤产生超连续谱的研究备受关注。采用熔融-淬冷法制备Ge23Sb12S65硫系玻璃,并以此为基质设计了用于超连续谱产生的高非线性光子晶体光纤。采用多极法分析光纤孔间距Λ、孔径比d/Λ等对光纤的色散零点位移、色散平坦调控、损耗及模场面积的影响,最终得到当Λ=2μm,d/Λ=0.43时,可获得2~4μm平坦色散的高非线性光子晶体光纤结构。
Photonic crystal fiber with no cut-off single mode, adjustable mode area and dispersion controllable properties, making it in the production of supercontinuum has a unique advantage. One of the conditions for the production of supercontinuum is that the optical fiber used must have a high degree of nonlinearity and the chalcogenide glass has a very high nonlinear coefficient. Therefore, the research on the supercontinuum generation using chalcogenide glass photonic crystal fiber has attracted much attention. The Ge23Sb12S65 chalcogenide glass was prepared by melt-quench method and used as matrix to design a highly nonlinear photonic crystal fiber for supercontinuum generation. The multipole method was used to analyze the influence of fiber pitch Λ, aperture ratio d / Λ on the chromatic dispersion zero dispersion, dispersion flattening, loss and mode field of the fiber. Finally, when Λ = 2μm and d / Λ = 0.43 Obtained 2 ~ 4μm flattened dispersion of highly nonlinear photonic crystal fiber structure.