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本文应用有效折射率／有限元法（ＥＩ－ＦＥＭ），计算和分析了半导体（量子阱）脊形光波导的模式特性、模式场分布及其变化规律．检验了ＥＩ－ＦＥＭ的精度，分析了其产生误差的原因．扩展了ＥＩ－ＦＥＭ，将其用于求解耦合波导系统，确定了方向耦合器的耦合特性及其变化规律．
In this paper, the mode characteristic, mode field distribution and variation of semiconductor (quantum well) ridge optical waveguide are calculated and analyzed by using effective refractive index / finite element method (EI-FEM). The accuracy of EI-FEM was tested and the reason for the error was analyzed. EI-FEM is extended and used to solve the coupled waveguide system. The coupling characteristics and the variation of the directional coupler are determined.