Integrated Hybrid Mode-Wavelength Demultiplexers Based on Cascaded Digital Metamaterials

被引:0
|
作者
Zhang, Shuhe [1 ]
Ye, Han [1 ]
Chen, Lei [1 ]
Li, Jing [1 ]
Liu, Yumin [1 ]
Chen, Zhihui [2 ]
机构
[1] Beijing Univ Posts & Telecommun, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
[2] Taiyuan Univ Technol, Coll Elect Informat & Opt Engn, Key Lab Adv Transducers & Intelligent Control Syst, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China
来源
ADVANCED PHOTONICS RESEARCH | 2024年 / 5卷 / 03期
基金
中国国家自然科学基金;
关键词
digital metamaterials; high-dimensional multiplexing; Inverse design; mode division multiplexing; wavelength division multiplexing; INVERSE DESIGN; COMPACT MODE; (DE)MULTIPLEXER; ULTRACOMPACT; OPTIMIZATION; MULTIPLEXERS; LIGHT;
D O I
10.1002/adpr.202300264
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
High-dimensional multiplexing technology is of importance in the on-chip photonic interconnections and challenging to design within ultracompact footprint. Herein, high-dimensional demultiplexers are proposed and demonstrated to enable wavelength-division and mode-division simultaneously. The functional regions of digital metamaterials are obtained by inverse design individually and are cascaded to work as high-dimensional demultiplexers. The gradient-based inverse design is carried out with an efficient method combining finite-element method, density method, and method of moving asymptotes. The performances are simulated by 3D finite difference time domain with silicon-on-insulator configuration. The proposed demultiplexer with four-channel has ultracompact footprint of 4.1 x 3.65 mu m2. Its average transmission efficiency is 38.7% and contrast ratios are higher than 13.0 dB. Besides, the proposed demultiplexer with six-channel has a footprint of 4.55 x 5.55 mu m2. Its average transmission efficiency is 24.3% and contrast ratios are higher than 11.8 dB. Digital metamaterials consisting of only silicon and air pixels are introduced to realize integrated hybrid mode-wavelength demultiplexing. The inverse design is carried out with an efficient gradient-based optimization method. A four-channel and a six-channel mode-wavelength demultiplexer are proposed. Both devices have compact footprint and high contrast ratio, which is a step forward for integrated high-dimensional photonic device design.image (c) 2024 WILEY-VCH GmbH
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页数:8
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