Low-loss and broadband cascaded SiN RGB coupler with dual-mode interference

被引:1
|
作者
Hu, Xiao-Long [1 ,2 ]
Jiang, Jian-Kun [1 ,2 ]
Liu, Wen-Jie [3 ]
机构
[1] South China Univ Technol, Engn Res Ctr Optoelect Guangdong Prov, Sch Phys & Optoelect, Guangzhou 510640, Peoples R China
[2] South China Univ Technol, Guangzhou Inst Modern Ind Technol, Guangzhou 511458, Peoples R China
[3] Guangdong Univ Technol, Sch Informat Engn, Guangzhou Prov Key Lab Photon Informat Technol, Guangzhou 510006, Peoples R China
基金
中国国家自然科学基金;
关键词
MULTIMODE INTERFERENCE; AUGMENTED REALITY; VIRTUAL-REALITY; DISPLAYS; PLATFORM; COMPACT;
D O I
10.1364/AO.477680
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We design and demonstrate a cascaded SiN-based RGB coupler with dual-mode interference (DMI) for a micro laser scanning image projector. The DMI configuration in SiN-based waveguides mitigates the adverse effects of self-image point deviation caused by wavelength dispersion, achieving decreased device length and high transmis-sion efficiency. The underlying mechanisms are discussed based on coupled-mode theory and 3D finite difference time domain simulation. A small footprint of 3 mu m x 70 mu m is achieved for the RGB coupler device without input/output circuits, and the insertion losses are less than 0.56 dB at RGB wavelengths. There are two orders of magnitude reduction in device length as compared with the conventional SiO2-based RGB coupler, which greatly promotes the miniaturization of the couplers and displays integration advantages with a laser diode and waveguide photodetector. In addition, the 3 dB bandwidth is over 50 nm for the coupler, and it demonstrates good fabrication tolerance. This design can further be integrated into visible light communication systems and applied to visible light integrated photonics.(c) 2023 Optica Publishing Group
引用
收藏
页码:944 / 949
页数:6
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