Sun Chunlei, Yu Yu, Chen Guanyu, Zhang Xinliang
Opt Lett. 2017 Aug 1;42(15):3004-3007. doi: 10.1364/OL.42.003004.
We propose and experimentally demonstrate a sharply bent multimode silicon waveguide by introducing a pair of mode converters. The principle of the multimode bend is based on the eigenmode conversion between straight and bent waveguides, and the particle swarm optimization is adopted to engineer the geometry. The device is fabricated on the standard silicon-on-insulator platform using one lithography/etching, and no additional steps are required. The measured results show that the insertion loss is <0.2 dB, and the inter-mode crosstalk is <-22 dB with a bend radius of 5 μm, from 1500 to 1600 nm. A comparable performance can be achieved using a conventional scheme with 40 μm radius.
我们提出并通过引入一对模式转换器对尖锐弯曲的多模硅波导进行了实验演示。多模弯曲的原理基于直波导和弯曲波导之间的本征模式转换，并采用粒子群优化算法来设计几何结构。该器件在标准绝缘体上硅平台上通过一次光刻/蚀刻工艺制造，无需额外步骤。测量结果表明，在弯曲半径为5μm、波长范围为1500至1600nm时，插入损耗<0.2dB，模式间串扰<-22dB。使用半径为40μm的传统方案可实现类似的性能。
