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依据自映像原理,设计了一种基于三角晶格光子晶体多模波导的1×2分束器。采用时域有限差分法模拟了光波在分束器中的传播行为,并计算了分束器的传输效率。结果表明,仅仅通过改变多模波导与输出波导联结处的介质柱的位置对结构进行优化,便可大大提高分束器在工作点频率处的传输效率和带宽,其多模耦合区的长度可低至3.1μm。因而本文所设计的分束器具有更小的器件尺寸和更高的传输效率,易于大规模集成的实现,在未来的集成光路中具有广泛的应用价值。
According to self - imaging principle, a 1 × 2 beamsplitter based on triangular lattice photonic crystal multimode waveguide was designed. The time-domain finite difference method was used to simulate the propagation of light waves in the beam splitter, and the transmission efficiency of the beam splitter was calculated. The results show that the transmission efficiency and bandwidth of the beamsplitter can be greatly improved only by changing the position of the dielectric column at the juncture of the multimode waveguide and the output waveguide. The length of the multimode coupling region As low as 3.1 μm. Therefore, the beam splitter designed in this paper has a smaller device size and higher transmission efficiency, easy to achieve large-scale integration, in the future integrated optical path has a wide range of applications.