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随着像多模光纤这样的模数极多的多模传输线路投入实用,了解其耦合特性就成为也具有实际意义的令人感兴趣的问题。作为探究多模传输线路耦合特性的第一步,本文拟就从单模传输线路向多模传输线路的耦合进行分析。在多模传输线路的模数极大这一假设条件下,给出耦合方程式的近似解,阐明耦合时存在泄漏波。至于理论的应用,考察了单模光纤和多模光纤的耦合,使用重新推导出的耦合系数理论公式,求出有关从单模光纤向多模光纤耦合之泄漏波的衰减常数。该结果将成为用分布耦合实现单模和多模光纤连接时的设计资料。用8.5GHz 的微波,进行了论证理论的实验。实验时使用了波导管,而单模波导管中的模振幅之测试值和理论值极近一致,由此确认了理论上假设之正确性。
As multimode transmission lines, such as multimode fibers, that have a very high modulus have become practical, understanding their coupling characteristics becomes an interesting issue of practical interest as well. As a first step to explore the coupling characteristics of multimode transmission lines, this paper intends to analyze the coupling from single-mode transmission lines to multimode transmission lines. Under the assumption that the module modulus of the multimode transmission line is extremely large, an approximate solution of the coupling equation is given, and the leaky wave exists when coupled. As for the application of the theory, the coupling between single mode fiber and multimode fiber is investigated. The decay constant of leakage wave coupling from single mode fiber to multimode fiber is obtained by using the deduced theorem of coupling coefficient. The result will be design information when distributed coupling is used to connect single mode and multimode fiber. With the 8.5GHz microwave, a demonstration of the theory of experiments. Waveguides were used in the experiment, whereas the amplitude of the mode-wave waveguide in the single-mode waveguide closely matched the theoretical value, confirming the correctness of the theoretical assumption.