空心光纤特性分析与实验研究

Experiment and Theory Analysis of Hollow Optical Fiber

为了探讨光功率在空心光纤中传输的变化规律,采用电磁场和几何光学理论的分析方法,并结合空心光纤特有的传光机理,得出了子午光线和小于最小半径的弧矢光线无法在纤芯与空心处正常传播的推论。并导出了空心光纤的传输损耗与空心、纤芯和包层折射率之间的关系。最后,运用上述结论对一系列的实验作了深入的分析,并用笔者建立的传输损耗公式(16)解释了树脂固化时,折射率上升与光纤输出光功率增强的变化规律等。

The change law of light transmission was investigated by means of the analysis of light transmission based on the theory of electromagnetic field and the theory of geometry-optics. In the hollow optical fiber, there are two interfaces, one is the interface between coating and core, the other is the interface between core and hollow. The meridian and the arc-vector beam (less than the minimal radius) cannot be transmitted in the interface between core and hollow. The relation between the light transmission and the refractive index of coating, core and hollow can be expressed by the formula established by the author (16). Based on the above conclusions, the experimental data were analyzed. The raw of the rise of index of refraction and output power was explained by formula (16).