光子晶体波导定向耦合光功分器的设计与优化

Design and optimization of photonic crystal waveguide directional coupling optical power splitter

基于波导定向耦合原理设计了一种全新的光子晶体波导定向耦合光功分器。采用时域有限差分法对这种器件的光波传输特性进行了数值分析,结果表明:本征模色散曲线之间相交;器件的尺寸比传统光功分器更小;入射到光功分器的能量平均分配到输出端,且光波透射率高达95%。这些优异特性对于制造大带宽、高透射率和结构紧凑的光电器件具有极大的应用价值。

A novel Photonic-Crystal-Waveguide （PCW）-based optical power splitter is designed on the basis of the waveguide directional coupling principle. The Finite-Difference Time-Domain （FDTD） method is adopted to make the numerical analysis of its optical waveguide transmission properties. The results show that the dispersion curves of the eigenmodes intersect among themselves; the splitter is shorter than the conventional ones, the incident energy to the optical power splitter is equally splitted to the output ports and the optical wave transmissivity is as high as 95%. These excellent properties are extremely useful in manufacturing photoelectronic devices with large bandwidth, high transmissivity and compact structure.