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Experimental investigation of high-speed WDM-visible light communication using blue, green, and red InGaN µLEDs

Optics Letters 2024年第16期49卷 4697-4700页

作者： Lu, Tingwei Dai, Yurong Lee, Tzu-Yi Wang, Shuhui Guo, Wenan Lai, Shouqiang Chen, Zhong Kuo, Hao-Chung Wu, Tingzhu National Integrated Circuit Industry and Education Integration Innovation Platform Department of Electronic Science Xiamen University Xiamen 361005 China College of Electrical and Computer Engineering National Yang Ming Chiao Tung University Department of Photonics and Graduate Institute of Electro-Optical Engineering Hsinchu 30010 Taiwan Semiconductor Research Center Hon Hai Research Institute Taipei 11492 Taiwan

Micro-light-emitting diodes (µLEDs) hold significant promise for applications in displays and visible light communication (VLC). This study substantiates the viability of a wavelength division multiplexing (WDM)-VLC system using InGaN blue, green, and red µLED devices. The devices exhibited notable color stability and high modulation bandwidth due to the weakly polarized electric field in the blue and green semipolar devices and the stress-optimized structure in the red device. The aggregated data rate reached 11.14 Gbps. Moreover, the blue, green, and red InGaN µLEDs exhibited a wide color gamut, encompassing 119.4% of the NTSC and 89.2% of the Rec. 2020 standards, affirming the potential of blue, green, and red InGaN µLEDs for applications in full-color display and WDM-VLC systems. © 2024 Optica Publishing Group.

关键词： Atomic layer deposition Bandpass filters Crosstalk Scanning electron microscopy Visible light communications Wavelength division multiplexing

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UMPS: A Unified Multi-Physics Simulation Framework for Photonic Device Thermal Management with Tri-Domain Integration

UMPS: A Unified Multi-Physics Simulation Framework for Photo...

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International Conference on Information Science and Communications Technologies (ICISCT)

作者： Kanchana Chathurangi Ahangama Chinthaka Premachandra Department of Electrical and Computer Engineering The Open University of Sri Lanka Nawala Sri Lanka Department of Advanced Electronic Engineering School of Engineering and Graduate School of Engineering and Science Shibaura Institute of Technology Tokyo Japan

ISBN: (数字)9798331527921

ISBN: (纸本)9798331527938

The wavelength instability of Distributed Feedback (DFB) lasers in telecommunication degrades system performance. While DFB lasers are popular for their stability in singlewavelength output generation, thermal fluctuation severely impacts them. Excessive heat also causes complete device failure. However, effective thermal management is a critical challenge in the design and operation of DFB lasers. The interaction among multiple properties of electrical, optical, and thermal domains makes it more challenging. To address this challenge, this study introduces a Unified MultiPhysics Simulation ( UMPS ) model that integrates electrical, optical, and thermal dynamics into a single, comprehensive framework. This innovative approach demonstrates the capability of accurate predictions of temperature distributions, identification of thermal hotspots, and optimization of thermal management strategies. The simulation conducted by the UMPS model captures both steady-state and transient thermal behaviors, providing valuable insights into how photonic devices respond to dynamic operating conditions. The proposed UMPS model not only advances the understanding of thermal dynamics in DFB lasers but also offers a versatile tool that can be applied to other photonic devices facing similar challenges. This model can potentially impact the design of next-generation photonic systems, ensuring their efficiency and reliability in increasingly demanding applications.

关键词： Integrated optics Laser theory Temperature distribution Optical feedback Distributed feedback devices Laser feedback Thermal management Laser modes Thermal stability Photonics

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Cloud-Native Mobile Application Applied for Law and Regulations Harmonization 3

Cloud-Native Mobile Application Applied for Law and Regulati...

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3rd International Conference on Intelligent Cybernetics Technology and Applications, ICICyTA 2023

作者： Al Qausar, Muhammad Juan Heryadi, Yaya Lukas, Lukas Suparta, Wayan Sonata, Ilvico Doctor of Computer Science Bina Nusantara University Binus Graduate Program Computer Science Department Jakarta Indonesia Jakarta Indonesia Institut Teknologi Nasional Yogyakarta Faculty of Industrial Technology Department of Electrical Engineering Yogyakarta Indonesia

ISBN: (纸本)9798350394559

Navigating the complex legal and regulatory landscape requires a sophisticated platform that is not only comprehensive but also user-friendly and enables seamless analysis and document comparison in the legal realm. To address this challenging requirement, this research is dedicated to the user experience (UX) design of state-of the-art cloud-native mobile applications specifically designed for legal and regulatory harmonization. The methodology used is based on design thinking principles and takes advantage of the benefits of cloud computing. These include, but are not limited to, scalability, reliability, and security. The result is a solution that is not only powerful but also cost-effective. The core of this application follows a user-centered design philosophy and involves potential users closely in the design process. A comprehensive evaluation is performed using the System Usability Scale (SUS) methodology to measure the effectiveness and usability of the application. The results of this comprehensive approach are convincing. The application has an impressive 95.5% usage rate, indicating strong user engagement. Furthermore, user satisfaction ratings are particularly high and transformative impact of this application in a complex environment of legal harmonization. Through its innovative design, seamless functionality, and user-centric approach, this application has proven to be not only a technical solution, but also a catalyst for positive change in the legal and regulatory harmonization process. © 2023 IEEE.

关键词： Cost effectiveness

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Development of a Battery-Less Wireless Sensor Node for Sediment Disaster Monitoring System

Development of a Battery-Less Wireless Sensor Node for Sedim...

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IEEE International Conference on Consumer electronics (ICCE)

作者： Naruse Yamamoto Kouta Kajiwara Keiichi Abe Department of Electrical & Electronic Engineering Graduate School of Engineering Kanagawa Institute of Technology Atsugi-City Japan Department of Home Appliance Engineering Faculty of Creative Engineering Kanagawa Institute of Technology Atsugi-City Japan

In the previous research, it has been challenging to achieve an operational period of more than three years for wireless sensor nodes used in landslide monitoring systems due to their high-power consumption, even with the use of large-capacity batteries. Therefore, in this study, we propose a novel technique for achieving long-term operation (approximately three years or more) of wireless sensor nodes in landslide monitoring systems without using batteries. Our approach involves the use of an original power supply circuit that combines environmental energy harvesting, electrochemical double-layer capacitors, and a DC-DC converter as a substitute for batteries.

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High Impedance Wire-loop Antennas for Wireless Power Transfer Systems

High Impedance Wire-loop Antennas for Wireless Power Transfe...

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2022 International Symposium on Antennas and Propagation (ISAP)

作者： Hiroto Sakaguchi Keisuke Noguchi Graduate Program in Electrical Engineering and Electronics Nonoichi Ishikawa Japan. Department of Electrical and Electronic Engineering Nonoichi Ishikawa Japan

ISBN: (数字)9781665479622

ISBN: (纸本)9781665479639

Highly efficient rectenna is demanded for wireless power transfer systems. We develop high-impedance wire-loop antennas in order to obtain high rectification efficiency in mm-wave band. We propose magnetic coupling with excited loop and wire so that the wire has role of efficient radiator. In the paper, simulations of a wire-loop antenna on an Alumina substrate are conducted. To get higher impedance and efficiency, we analyze the effects of antenna parameters on the antenna characteristics. Consequently, we designed the antenna with high resistance of 1280.6 $\Omega$ and radiation efficiency of 95.1%.

关键词： Resistance Couplings Rectennas Wires Wireless power transfer Information and communication technology Impedance

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A Load-Independent Multi-Relays Wireless Power Transfer with Self-Regulation and Single Compensation Network 14

A Load-Independent Multi-Relays Wireless Power Transfer with...

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14th Annual IEEE Applied Power electronics Conference and Exposition, APEC 2025

作者： Kim, Jong-Hun Ul Hassan, Najam Jeong, Seogyong Kim, Myeong-Ho Kim, Min-Sik Jung, Jee-Hoon Lee, Byunghun Shin, Se-Un Graduate School of Semiconductor Technology Pohang Korea Republic of University of Michigan Department of Electrical Engineering Dearborn United States Samsung Electronics Seoul Korea Republic of Department of Electrical Engineering Pohang Korea Republic of Department of Electrical Engineering Ulsan Korea Republic of Hanyang University Department of Electronic/Biomedical Engineering Seoul Korea Republic of

ISBN: (纸本)9798331516116

Wireless power transfer (WPT) technology is gaining prominence as a research focus in both industry and academia, particularly for applications where delivering power via metallic conductors is impractical. This paper introduces a WPT system designed for easy implementation near real-world demands, achieved through reduced circuit components and manufacturing costs. The system efficiently supplies power to various electrical devices that require constant-voltage (CV), constant-current (CC), or both CV/CC modes simultaneously like lithium-ion (Li-Ion) batteries. A single compensation network enables straightforward attainment of either CV or CC output, facilitated by a load-independent power-stage and control methodology. Experimental results demonstrate a PWM-based resonant regulating rectifier (3R), achieving a maximum power transfer efficiency (PTE) of 74.5% under two loads positioned 300 mm apart from a half-bridge class-D power transmitter (Tx). © 2025 IEEE.

关键词： Electric power transmission networks

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Detection of polymeric insulator defects based on YOLOv8

Detection of polymeric insulator defects based on YOLOv8

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International Conference on High Voltage engineering and Application, ICHVE

作者： Samuel C. Nóbrega George R. S. Lira Pablo B. Vilar Post-Graduate Program in Electrical Engineering Federal University of Campina Grande Campina Grande Brazil Department of Electrical Engineering Federal University of Campina Grande Campina Grande Brazil

ISBN: (数字)9798350374988

ISBN: (纸本)9798350374995

This work proposes using the You Only Look Once (YOLO) architecture for defect detection in suspension polymeric insulators from images. Firstly, an image dataset of 138 kV polymeric suspension insulators was developed. Then, the dataset was augmented by horizontal and vertical flips to increase the training data. Afterward, YOLOv8n and YOLOv8s architectures were trained and used to detect insulator defects from the captured images. The developed models can detect four insulator defects: exposed rod, end fitting corrosion, cracks, and damaged sheds. Finally, the trained models were evaluated based on precision, recall, mean Average Precision (mAP), and confusion matrix. The results showed that YOLOv8s presented satisfactory results and potential for deploying and experimentation on UAVs to monitor polymeric insulators.

关键词： YOLO Training Sensitivity Computational modeling Corrosion Fitting Training data

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Quantum Wrapper Networking: Investigating the Noise Impact of Classical Headers on the Quantum Payload

Quantum Wrapper Networking: Investigating the Noise Impact o...

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2024 Frontiers in Optics, FiO 2024

作者： Gül, Gamze On, Mehmet Berkay Tan, Shannon G. Proietti, Roberto Kanter, Gregory S. Yoo, S.J. Ben Kumar, Prem Graduate Program in Applied Physics Northwestern University 2145 Sheridan Road EvanstonIL60208 United States Department of Electrical and Computer Engineering University of California Davis DavisCA95616 United States Center for Photonic Communication and Computing Dept. of Electrical and Computer Eng. Northwestern University EvanstonIL60208 United States Department of Electronics and Telecommunications Engineering Politecnico di Torino Italy

We study the impact in time and frequency domains of classical headers on quantum payloads in quantum wrapper networking. We identify and characterize in-fiber scattering processes that produce noise photons degrading...

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Evaluating a frailty education program implemented through barbershops/salons in Japan: A preliminary study

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SN Social Sciences 2022年第5期2卷 1-13页

作者： Makabe, Sachiko Fujiwara, Katsuya Kume, Yu Kaga, Midori Munemura, Nobuko Kemuyama, Shoko Mitobe, Kazutaka Department of Nursing Akita University Graduate School of Health Sciences 1-1-1 Hondo Akita 010-8543 Japan Department of Mathematical Science and Electrical-Electronic-Computer Engineering Akita University Graduate School of Engineering Science Akita Japan Department of Occupational Therapy Akita University Graduate School of Health Sciences Akita Japan

Although frailty has detrimental physical and psychological effects on elderly people, it is potentially reversible. In this study, we aim to evaluate the effectiveness of a pilot frailty education program implemented through barbershops/salons in Japan. In January 2018, we selected five barbershops/salons in Japan where customers were educated on frailty, which was classified as “normal,” “prefrail,” and “frail.” We developed a web-based assessment tool to reduce the workload for barbers/stylists. Participants included 45 customers (82% women), with a median (interquartile range) age of 53.0 (47.5–57.5) years, and a mean ± SD BMI of 22.3 ± 2.7. Frailty scores indicated that 35% of participants were normal, 58% were prefrail, and 7% were frail. Frailty status scores reflected no significant differences after the intervention. Customers classified as frail were advised to visit the regional comprehensive support center for further professional frailty assessment. Participants, especially those aged over 65 years, found the web-based assessment difficult to use. In conclusion, a frailty education program implemented through barbershops/salons is possible because barbers/stylists can provide information on and assessment of frailty. Females and highly educated customers are more likely to be interested in participating. Nevertheless, a simple intervention is essential to expand the program nationwide. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2022.

关键词： Barbershop Frailty Health educator Salon Super-aging society

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A Low-Power Single-Phase Split-Controlled Flip-Flop With No Redundant Switching

A Low-Power Single-Phase Split-Controlled Flip-Flop With No ...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Zhuoya Yan Yingna Huang Hailong Jiao School of Electronic and Computer Engineering Peking University Shenzhen Graduate School Shenzhen China Department of Electrical and Computer Engineering National University of Singapore Singapore

ISBN: (数字)9798350330991

ISBN: (纸本)9798350331004

Flip-flops with ultra-wide-range dynamic voltage scaling capability are attractive for ultra-low power applications. In this paper, a single-phase split-controlled flip-flop (SCFF) is proposed for ultra-wide-range dynamic voltage scaling. By employing a differential structure in the master latch and a unique split-controlled slave latch, the proposed SCFF possesses desirable features for ultra-low voltage operations. Designed in a 55-nm low-power CMOS technology, SCFF achieves 0.4 V minimum supply voltage, and reduces the power-delay-product (PDP) by up to 79.7% compared to the state-of-the-art flip-flops at the typical process corner with 12.5% input toggle rate. SCFF also maintains the benefit of low PDP at different process corners and different supply voltages.

关键词： Latches Circuits and systems Switches CMOS technology Dynamic voltage scaling Delays Low-power electronics

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