Bian Yusheng, Ren Qiang, Kang Lei, Qin Yifeng, Werner Pingjuan L, Werner Douglas H
Computational Electromagnetics and Antennas Research Lab (CEARL), Department of Electrical Engineering, The Pennsylvania State University University Park, PA, 16802, USA.
School of Electronics and Information Engineering, Beihang University, Beijing, 100191, China.
Sci Rep. 2017 Nov 20;7(1):15827. doi: 10.1038/s41598-017-16096-9.
Reduction of the crosstalk between adjacent photonic components has been regarded as one of the most effective, yet most challenging approaches for increasing the packing density of photonic integrated circuits. Recently, extensive efforts have been devoted to this field, leading to a number of elaborate designs, such as waveguide supperlattice and nanophotonic cloaking, among others. Here we develop a simple and efficient crosstalk reduction approach for silicon-based nanophotonic circuits by introducing a periodic array of silicon strips between adjacent waveguides. Studies indicate that the coupling lengths can be extended by more than two orders of magnitude for a waveguide pair with an edge-to-edge distance of ~λ/3 at the telecommunication wavelength. Further investigations reveal that our method is effective for both strongly and weakly confined silicon photonic modes, and works well over a broad band of operational wavelengths. In addition, the crosstalk reduction technique is shown to be capable of improving the coupling lengths of other elements as well, such as vertical silicon slot waveguides. Our approach offers a promising platform for creating ultra-compact functional components that is fabrication friendly, thereby providing a feasible route toward the realization of photonic integrated circuits with ultra-high packing densities.
减少相邻光子组件之间的串扰，已被视为提高光子集成电路封装密度最有效但也最具挑战性的方法之一。最近，该领域已投入大量努力，产生了许多精心设计，如波导超晶格和纳米光子隐身等。在此，我们通过在相邻波导之间引入周期性排列的硅条，为基于硅的纳米光子电路开发了一种简单有效的串扰减少方法。研究表明，对于在电信波长下边缘到边缘距离约为λ/3的波导对，耦合长度可延长两个以上数量级。进一步研究表明，我们的方法对强约束和弱约束的硅光子模式均有效，并且在很宽的工作波长范围内都能很好地工作。此外，串扰减少技术还显示能够改善其他元件的耦合长度，如垂直硅槽波导。我们的方法为制造超紧凑功能组件提供了一个有前景的平台，该平台易于制造，从而为实现超高封装密度的光子集成电路提供了一条可行途径。
