中红外双零色散全固硫系微结构光纤

All-Solid Chalcogenide Microstructured Optical Fiber with Two Zero-Dispersion Mid-Infrared Wavelengths

基于As_2Se_3和As_2S_5两种硫系玻璃,设计了一种结构简单、易于拉制,且在中红外具有双零色散波长的全固微结构光纤。利用有限时域差分法对该光纤的有效折射率、有效模面积、非线性系数、色散系数及群速度进行了数值分析,结果表明,随着As_2S_5棒直径和棒间距的变化,中红外区域的2个零色散波长位置在很大范围内可调,尤其是第2个零色散波长最大可达7388 nm,零色散波长间距可以从2706 nm连续调节至3773 nm,为中红外非线性光纤光学及其应用提供了一定的理论指导。

Based on As2Se3 and As2S5 glasses, an all-solid microstructured optical fiber with simple and easily drawing structure, and two zero-dispersion wavelengths in the mid-infrared is designed. Its effective refractive index, effective mode area, nonlinear coefficient, dispersion and group velocity are numerically simulated by the finite-difference time-domain method. The result shows that dynamic adjustment of the two zero-dispersion wavelengths can be realized in the mid-infrared, and the second zero-dispersion wavelength can shift to the maximum wavelength of 7388 nm. The space between the two zero-dispersion wavelengths can continually be changed from 2706 nm to 3773 nm. This work provides a theoretical guidance for the application of nonlinear fiber optics.