Please use this identifier to cite or link to this item: https://doi.org/10.1109/JSTQE.2018.2811902
Title: Compact Low Loss Mid-Infrared Wavelength-Flattened Directional Coupler (WFDC) for Arbitrary Power Splitting Ratio Enabled by Rib Waveguide Dispersion Engineering
Authors: Dong, Bowei 
Luo, Xianshu
Hu, Ting
Guo, Tina Xin
Wang, Hong
Kwong, Dim-Lee 
Lo, Patrick Guo-Qiang
Lee, Chengkuo 
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Electrical & Electronic
Quantum Science & Technology
Optics
Physics, Applied
Engineering
Physics
Dispersion
Optical coupling
Optical losses
Optical waveguides
Photonic integrated circuits
Silicon photonics
SILICON
DESIGN
POLARIZATION
DEPENDENCE
CIRCUITS
SENSOR
Issue Date: 1-Jul-2018
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation: Dong, Bowei, Luo, Xianshu, Hu, Ting, Guo, Tina Xin, Wang, Hong, Kwong, Dim-Lee, Lo, Patrick Guo-Qiang, Lee, Chengkuo (2018-07-01). Compact Low Loss Mid-Infrared Wavelength-Flattened Directional Coupler (WFDC) for Arbitrary Power Splitting Ratio Enabled by Rib Waveguide Dispersion Engineering. IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS 24 (4). ScholarBank@NUS Repository. https://doi.org/10.1109/JSTQE.2018.2811902
Abstract: © 2018 IEEE. We design, fabricate, and characterize a novel type of wavelength-flattened directional coupler (WFDC) working in the mid-infrared (MIR) based on the physics of rib waveguide dispersion. In the silicon-on-insulator rib waveguide WFDC devices with length <20 μm, a 6-fold enhancement and a 4-fold enhancement in the operation bandwidth compared with the conventional directional coupler are achieved for 50:50 (±5) and 100:0 (-2) power splitting ratio, respectively, with an average low excess loss of -0.52 ± 0.18 dB/device. To the best of our knowledge, our device is the first WFDC working in the MIR and the first WFDC that possesses low excess loss, CMOS compatibility and compactness simultaneously, while the novel mechanism could be adopted easily to realize arbitrary power splitting ratio. Our work could serve as a promising component for light routing and power splitting in broadband MIR applications, such as MIR spectrometer sensing systems. In addition, the proposed novel mechanism could be adopted for near-infrared as well to achieve better WFDC performance.
Source Title: IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
URI: https://scholarbank.nus.edu.sg/handle/10635/177390
ISSN: 1077260X
15584542
DOI: 10.1109/JSTQE.2018.2811902
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