Liu Qiang, Zeng Desheng, Mei Chenyang, Li Hongwei, Huang Qingzhong, Zhang Xinliang
Opt Express. 2022 Mar 14;30(6):9450-9462. doi: 10.1364/OE.452450.
Integrated photonic devices play a key role in modern optical communications, of which optical resonators are important fundamental structures. This work proposes and experimentally demonstrates compact integrated photonic devices based on a traveling wave-like Fabry-Perot (TW-like FP) resonator(s) coupled with waveguides. Add-drop filters based on a single TW-like FP resonator have been realized with a high drop efficiency and the same output direction for the through and drop ports. Particularly, their transmission response can be either symmetric Lorentzian or asymmetric Fano line shape, through adjusting the shift between the two bus waveguides and the waveguide widths. Fano resonance has been demonstrated in a TW-like FP resonator with a very high extinction ratio and large slope rate. The second-order optical filter exhibits low-loss flat-top passbands with small ripples. Owing to the compact size, easy scalability, and large flexibility, TW-like FP cavity-based devices using Fano and Lorentzian resonances will provide new potential applications in integrated photonics.
集成光子器件在现代光通信中起着关键作用，其中光学谐振器是重要的基础结构。这项工作提出并通过实验证明了基于与波导耦合的行波型法布里 - 珀罗（TW 型 FP）谐振器的紧凑型集成光子器件。基于单个 TW 型 FP 谐振器的分插复用滤波器已实现，具有高插损效率以及直通端口和分插端口相同的输出方向。特别地，通过调整两个总线波导之间的偏移和波导宽度，它们的传输响应可以是对称洛伦兹型或非对称法诺线型。在具有非常高的消光比和大斜率率的 TW 型 FP 谐振器中已证明了法诺共振。二阶光学滤波器呈现出具有小纹波的低损耗平顶通带。由于尺寸紧凑、易于扩展且灵活性大，基于 TW 型 FP 腔的利用法诺和洛伦兹共振的器件将在集成光子学中提供新的潜在应用。
