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在基于微结构光纤(MOFs)的非线性装置中,光纤的非线性系数是一个很重要的参数,它受包层空气孔不均匀性的影响。用全矢量有限元法和误差理论分析了包层空气孔孔径的不均匀性对六角形高非线性微结构光纤非线性系数的影响。通过计算,得到了这种光纤HE1x1和HEy11模的非线性系数与每个空气孔孔径之间的关系,从而进一步得到了非线性系数的标准差与包层空气孔孔径标准差之间的关系。这样,在已知孔径的标准差时,很容易得到非线性系数的标准差。当孔径标准差与孔径设计值的比为5%时,HE1x1和HE1y1模非线性系数标准差与均匀孔径情况下非线性系数值的比分别为2.55%和3.06%。
In nonlinear devices based on micro-structured optical fibers (MOFs), the nonlinearity coefficient of the optical fiber is a very important parameter, which is affected by the unevenness of the cladding air holes. The effect of the nonuniformity of cladding air hole diameter on the nonlinear coefficient of hexagonal highly nonlinear microstructured optical fiber is analyzed by full vector finite element method and error theory. The relationship between the nonlinear coefficient of each of the HE1x1 and HEy11 modes and the aperture of each air hole is obtained by calculation, and the relationship between the standard deviation of the nonlinear coefficient and the standard deviation of the air hole diameter of the cladding is obtained. In this way, it is easy to get the standard deviation of the nonlinear coefficient when the standard deviation of the known aperture is known. When the ratio of standard deviation of aperture to design value of aperture is 5%, the ratio of standard deviations of nonlinear coefficients of HE1x1 and HE1y1 to non-linear coefficients of uniform aperture are 2.55% and 3.06%, respectively.