从导波的射线理论出发，导出了波导单模条件，运用有效折射率法完成了单模波导的优化设计。
Starting with waveguide ray theory, the condition for single-mode waveguide is derived, and design of single-mode strip waveguide is accomplished with effective index method.
研究了平面平板波导的射线理论分析法和电磁场分析法，条形波导的马卡梯里法和等效折射率法。
The ray optics and wave optics methods for slab waveguides are also explained while the Marcatili's method and the effective index method are introduced for channel waveguides.
在空间时代，沿射线路径的总折射率是研究电波传播的重要参数。
The total refractivity content along the ray path is an important propagation parameter in space times.
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