A novel an optical four-channel demultiplexer based on a hexagonal lattice shape of embedded air holes in dielectric substrate (air-bridge type) is proposed. Demultiplexing for each channel is obtained by designing the graphite-type ring resonator which consists of small air hole defects in own unit cells. The physical parameters which govern the demultiplexer performance are investigated. It is observed that employing big air hole as a defect in the end of input waveguide enhanced the coupling efficiency between the rings and waveguides. By engineering the refractive index of substrate and size of air holes, the proposed demultiplexer is tuned. The demultiplexer has an average quality factor > 3000 and channel spacing \(\Delta \lambda \le 2\;{\text{nm}}\). We showed that big air hole defect in the end of input waveguide is an effective scheme for improving the transmission efficiency and cross talk between channels. The average transmission efficiency and cross talk value are above 98% and − 23 dB, respectively. The total size of proposed structure and its maximum delay time are 289 μm² and 0.3 ps, respectively. Our demultiplexer has an easy fabrication structure, and it can find key applications for many cores CPU in an on-chip optical network and the dense wavelength demultiplexing in optical integrated circuits.

中文翻译：

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基于气桥结构和石墨型环形谐振器的光学四通道解复用器

提出了一种新颖的基于光介质衬底中嵌入气孔的六边形格子形状的光学四通道解复用器（气桥型）。通过设计石墨型环形谐振器实现每个通道的多路分解，该环形谐振器由自身单元电池中的小气孔缺陷组成。研究了控制解复用器性能的物理参数。可以看出，采用大的气孔作为输入波导末端的缺陷可以提高环形和波导之间的耦合效率。通过设计基板的折射率和气孔的尺寸，可以对所提出的多路分解器进行调谐。解复用器的平均质量因子> 3000，通道间隔为\（\ Delta \ lambda \ le 2 \; {\ text {nm}} \）。我们表明，输入波导末端的大气孔缺陷是提高传输效率和通道间串扰的有效方案。平均传输效率和串扰值分别高于98％和− 23 dB。提出的结构的总的大小和它的最大延迟时间是289微米²分别和0.3 PS，。我们的解复用器具有易于制造的结构，可以找到片上光网络中许多核CPU的关键应用，以及光集成电路中的密集波长解复用。