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本文从理论和实验分析了多模和单模光纤传输线的带宽特性。多模光纤传输线带宽计算比较复杂,至今还没有完善的有效理论。对现代低损耗光纤,折射率分布是决定传输线带宽的主要因素。由稳态条件下测量的单根光纤传递函数的线性组合确定的传输线总传递函数(总带宽),和实际测量结果非常一致,可用于工程设计。对于单模光纤,由于批量生产的光纤零色散波长和光源中心波长都存在一定的分布,用统计理论来估算传输线总带宽更合适。多模和单模光纤传输线都可以利用色散补偿效应来改善带宽特性。
This paper analyzes the bandwidth characteristics of multimode and single-mode optical fiber transmission lines theoretically and experimentally. Multi-mode optical fiber transmission line bandwidth calculation is more complex, so far there is no sound and effective theory. For modern low-loss fibers, the refractive index profile is a major factor in determining the bandwidth of the transmission line. The transmission line total transfer function (total bandwidth), as determined by the linear combination of single fiber transfer functions measured at steady-state conditions, is very consistent with the actual measurement and can be used for engineering design. For single-mode fiber, due to the zero-dispersion wavelength of the fiber produced and the center wavelength of the light source, there is a certain distribution. It is more appropriate to estimate the total bandwidth of the transmission line by the statistical theory. Both multimode and single-mode optical fiber transmission lines can utilize the dispersion compensation effect to improve the bandwidth characteristics.