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一、引言 光源与光纤、光纤与光纤之间的功率耦合计算是光纤传输理论要研究的一个基本问题,国内外学者做了很多工作,提出过各种方法。从电磁场理论出发,利用耦合模理论可以进行严格的场解;从工程设计计算考虑,也有不少文献利用几何光学理论来处理多模光纤的耦合计算。一般方法的基本思想是将光源或输入光纤看作一个辐射分布已知的辐射源,然后通过变换求得接受光纤端面上的辐射分布从而求得耦合到接受光纤中的光功率。这类方法
I. Introduction Light source and optical fiber, optical fiber and optical power coupling calculation between the optical transmission theory to study a basic issue, scholars at home and abroad have done a lot of work, put forward various methods. From the theory of electromagnetic field, the coupled field theory can be used to solve the rigorous field solution. Considering the engineering design and calculation, many literatures use the theory of geometrical optics to deal with the coupling calculation of multimode fiber. The general idea of the general method is to consider the light source or input fiber as a radiation source with a known radiation distribution and then obtain the optical power coupled into the receiving fiber by transforming the radiation distribution on the end face of the receiving fiber. Such methods