Wu Sailong, Mu Xin, Cheng Lirong, Mao Simei, Fu H Y
Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, China.
Micromachines (Basel). 2020 Mar 20;11(3):326. doi: 10.3390/mi11030326.
In the past few decades, silicon photonics has witnessed a ramp-up of investment in both research and industry. As a basic building block, silicon waveguide crossing is inevitable for dense silicon photonic integrated circuits and efficient crossing designs will greatly improve the performance of photonic devices with multiple crossings. In this paper, we focus on the state-of-the-art and perspectives on silicon waveguide crossings. It reviews several classical structures in silicon waveguide crossing design, such as shaped taper, multimode interference, subwavelength grating, holey subwavelength grating and vertical directional coupler by forward or inverse design method. In addition, we introduce some emerging research directions in crossing design including polarization-division-multiplexing and mode-division-multiplexing technologies.
在过去几十年里，硅光子学在研究和工业领域都经历了投资的增加。作为一个基本构建模块，硅波导交叉对于密集的硅光子集成电路来说是不可避免的，而高效的交叉设计将极大地提高具有多个交叉的光子器件的性能。在本文中，我们聚焦于硅波导交叉的最新技术水平和发展前景。它回顾了硅波导交叉设计中的几种经典结构，例如通过正向或反向设计方法的成形锥形、多模干涉、亚波长光栅、多孔亚波长光栅和垂直定向耦合器。此外，我们还介绍了交叉设计中一些新兴的研究方向，包括偏振分复用和模分复用技术。
