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基于数值模拟方法研究了弯曲效应对ZBLAN光纤中红外超连续光谱产生的影响。利用有限元方法分析了宏观弯曲效应对不同数值孔径ZBLAN光纤的限制损耗、色散和非线性特性的影响,计算出ZBLAN光纤的弯曲截止波长,基于广义非线性薛定谔方程模拟了ZBLAN光纤中红外超连续谱产生的演化过程。研究发现,在未发生弯曲的情况下,非线性系数在中红外波段迅速下降会限制低数值孔径ZBLAN光纤中的光谱展宽;在发生弯曲时,当孤子中心频率接近弯曲损耗边界时,孤子自频移效应被抑制,光谱展宽停止。
The influence of bending effect on the generation of mid-IR supercontinuum in ZBLAN fiber was studied based on numerical simulation. The influence of macro-bending effect on the limiting loss, dispersion and non-linearity of ZBLAN fiber is analyzed by finite element method. The bending cutoff wavelength of ZBLAN fiber is calculated. Based on the generalized nonlinear Schrödinger equation, The evolution of the spectrum. It is found that the non-linear coefficient decreases rapidly in the mid-IR band without limitation, which limits the spectral broadening in the low-NA ZBLAN fiber. When the central frequency of the soliton approaches the bending loss boundary, the soliton self-frequency The shift effect is suppressed and the spectrum broadening stops.