Long Jing, Jia Haitao, Zhang Jialiang, Chen Changshui
Appl Opt. 2024 Mar 10;63(8):2030-2035. doi: 10.1364/AO.514365.
Multimode power splitters are the fundamental building blocks in mode division multiplexing systems. In this paper, we propose a low-loss and compact, dual-mode, 3-dB power splitter for the two lowest TE modes combining three different structures, including a directional coupler, a multimode interferometer, and a Y-junction. The coupling length of the proposed device is only 7.2 µm. For both and modes, the numerical simulation shows that the insertion loss is only less than 0.1 dB and crosstalk is less than -20 at the wavelength range of 1520-1580 nm. The working bandwidth can cover the entire C-band. It offers a potential solution for a 3-dB power splitter of the two lowest TE modes.
多模功率分配器是模式分割复用系统中的基本构建模块。在本文中，我们提出了一种低损耗且紧凑的双模3分贝功率分配器，用于两种最低阶的横电（TE）模式，它结合了三种不同结构，包括一个定向耦合器、一个多模干涉仪和一个Y型结。所提出器件的耦合长度仅为7.2微米。对于TE₀₀和TE₀₁模式，数值模拟表明，在1520 - 1580纳米的波长范围内，插入损耗仅小于0.1分贝，串扰小于 - 20分贝。工作带宽可以覆盖整个C波段。它为两种最低阶TE模式的3分贝功率分配器提供了一种潜在的解决方案。
