摘要
以波导结构的单向耦合器为例,将复坐标变量完全匹配层应用于光器件的模场分析,采用有限差分方法构造出模场的本征方程,通过数值求解得到器件的传播模场和等效折射率。结果表明等效折射率随间距变化而变化,间距越大,等效折射率越趋向于单根光波导的值,为准确分析无源光器件内部模场分布打下了基础。
By taking the unidirectional coupler for example, the question of mode field distributions in passive devices is solved by using the duplicate coordinates variable PML. The eigen eqution of mode field distributions is set up by using the finite difference method. The mode field distributions and the equivalent refractive index（neff） of the device are obtained. The results show that the neff varies with the slab spacing. When the slab spacing is larger, the neff trends to the value of the single waveguide. It provides the basis for accurate analysis of the inner mode field in the passive optical device.
出处
《光学与光电技术》
2007年第6期12-14,17,共4页
Optics & Optoelectronic Technology
基金
浙江省重点科研项目(2005c21029)
