距离相关波导中正交模振幅的射线描述
Ray-based description of normal mode amplitudes in a range-dependent waveguide
摘要：
本文用几何光学的一种类似方法来描述距离相关波导中波场的模式结构。在这种方法的范围内的模式振幅表示通过射线方程的解决方案。这种分析描述占模式耦合，并在非绝热环境中仍然有效。并利用它探讨了绝热近似的适用条件。一个适用性标准制定为限制的射线的作用变量的变化。
英文摘要：
An analogue of the geometrical optics for description of the modal structure of a wave field in a range-dependent waveguide is considered. In the scope of this approach the mode amplitude is expressed through solutions of the ray equations. This analytical description accounts for mode coupling and remains valid in a nonadiabatic environment. It has been used to investigate the applicability condition of the adiabatic approximation. An applicability criterion is formulated as a restriction on variations of the action variable of the ray.
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