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分析了多光子晶体谐振腔的并联耦合模理论,并根据该理论设计了单通道光子晶体侧面耦合波导以实现光子晶体器件与光源间的高效耦合。理论研究表明并联谐振腔的耦合效率与谐振腔数量、间距以及品质因子相关。经优化耦合面积和耦合效率,最终选择了5个谐振腔并联作为单通道侧面耦合波导的耦合部分。通过设置谐振腔间距改变其对称性,从而实现侧面耦合波导的单通道传播。在1.55μm工作波长下,单通道侧面耦合波导的耦合效率可达94.49%。
The parallel coupled mode theory of multi-photonic crystal resonator is analyzed. According to this theory, a single-channel photonic crystal side-coupled waveguide is designed to realize the efficient coupling between the photonic crystal device and the light source. Theoretical studies show that the coupling efficiency of parallel resonators is related to the number of resonators, spacing and quality factor. By optimizing the coupling area and coupling efficiency, five resonant cavities are selected in parallel to act as the coupling part of the single-channel side-coupled waveguide. By setting the resonant cavity pitch to change its symmetry, in order to achieve the side of the coupling waveguide single-channel propagation. The coupling efficiency of the single side-channel waveguide can reach 94.49% under the operating wavelength of 1.55μm.