Jiang Weifeng, Mao Siqiang, Hu Jinzhu
Opt Lett. 2024 Aug 1;49(15):4346-4349. doi: 10.1364/OL.528307.
A higher-order mode (HOM) pass filter is a key component in on-chip mode-division multiplexing (MDM) systems, enabling mode-selective transmission. In this study, a highly integrated silicon-based HOM pass filter is proposed based on "mode-scattering evolution." The proposed filter consists of a functional region and input/output waveguides, with a compact footprint of only 2 µm × 9 µm achieved through an inverse design. Experimental results demonstrate that the fabricated silicon-based HOM pass filter exhibits an insertion loss of 2.11 dB and a crosstalk of -10.63 dB at 1550 nm. The bandwidth with a loss <5 dB is measured to be 90 nm. The proposed device offers an efficient solution for on-chip mode-selective filtering, which can provide a promising technology for building integrated MDM systems.
高阶模式（HOM）滤波器是片上模式分割复用（MDM）系统中的关键组件，可实现模式选择性传输。在本研究中，基于“模式散射演化”提出了一种高度集成的硅基HOM滤波器。所提出的滤波器由功能区和输入/输出波导组成，通过逆向设计实现了仅2 µm×9 µm的紧凑尺寸。实验结果表明，所制备的硅基HOM滤波器在1550 nm处的插入损耗为2.11 dB，串扰为-10.63 dB。损耗<5 dB的带宽测量为90 nm。所提出的器件为片上模式选择性滤波提供了一种有效解决方案，可为构建集成MDM系统提供有前景的技术。
