研究绝热式方向性偶合器修正型汉明权重函数之适当波导长度与结构影响。传统的光方向耦合器之理论是由绝热条件下所获得之结果,因此在波导耦合长度不夠长时则变得可疑,有鑑于此需要依靠光束模拟软件。文中主要的指标为修正型汉明权重函数之低串扰、宽频宽和较短的耦合器长度。最后由结果得知我们所提出使用的修正型汉明权重函数在此架构下能获得较佳的设计结果。 The proper waveguide length and structure influence of the modified Hamming weight function of adiabatic directional coupler are studied. The conventional theory of the optical directional coupler is the result of adiabatic conditions and therefore becomes suspect when the waveguide coupling length is not sufficiently long, in view of the need to rely on beam modeling software. The main indicators in this paper are the low crosstalk, wide bandwidth and short coupler length of the modified Hamming weight function. Finally, the result shows that the modified Hamming weight function we proposed can obtain better design results under this framework.