Self-organized micro-light-emitting diode structure for high-speed solar-blind optical wireless communications

2020 ◽  
Vol 117 (3) ◽  
pp. 031103 ◽  
Author(s):  
K. Kojima ◽  
Y. Yoshida ◽  
M. Shiraiwa ◽  
Y. Awaji ◽  
A. Kanno ◽  
...  
Keyword(s):  
Wireless Communications ◽  
High Speed ◽  
Light Emitting Diode ◽  
Diode Structure ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Light Emitting ◽  
Self Organized ◽  
Solar Blind

scholarly journals Demonstration of High-speed Indoor Optical Wireless Communications using Few-mode Based Uniform Beam Shaping

2020 ◽  
Author(s):  
Jianghao Li ◽  
Christina Lim ◽  
Ampalavanapillai Nirmalathas ◽  
Nicholas O'Keefe ◽  
Ka-Lun Lee
Keyword(s):  
Wireless Communications ◽  
High Speed ◽  
Beam Shaping ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Uniform Beam

scholarly journals Fuzzy Based Network Assignment and Link-Switching Analysis in Hybrid OCC/LiFi System

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Moh. Khalid Hasan ◽  
Mostafa Zaman Chowdhury ◽  
Md. Shahjalal ◽  
Yeong Min Jang
Keyword(s):  
Hybrid System ◽  
Communication Systems ◽  
High Speed ◽  
Light Emitting Diode ◽  
Flow Analysis ◽  
Optical Wireless Communications ◽  
Light Emitting ◽  
High Speed Data ◽  
Transmission Capability ◽  
Time Division

In recent times, optical wireless communications (OWC) have become attractive research interest in mobile communication for its inexpensiveness and high-speed data transmission capability and it is already recognized as complementary to radio-frequency (RF) based technologies. Light fidelity (LiFi) and optical camera communication (OCC) are two promising OWC technologies that use a photo detector (PD) and a camera, respectively, to receive optical pulses. These communication systems can be implemented in all kinds of environments using existing light-emitting diode (LED) infrastructures to transmit data. However, both networking layers suffer from several limitations. An excellent solution to overcoming these limitations is the integration of OCC and LiFi. In this paper, we propose a hybrid OCC and LiFi architecture to improve the quality-of-service (QoS) of users. A network assignment mechanism is developed for the hybrid system. A dynamic link-switching technique for efficient handover management between networks is proposed afterward which includes switching provisioning based on user mobility and detailed network switching flow analysis. Fuzzy logic (FL) is used to develop the proposed mechanisms. A time-division multiple access (TDMA) based approach, called round-robin scheduling (RRS), is also adopted to ensure fairness in time resource allocation while serving multiple users using the same LED in the hybrid system. Furthermore, simulation results are presented taking different practical application scenarios into consideration. The performance analysis of the network assignment mechanism, which is provided at the end of the paper, demonstrates the importance and feasibility of the proposed scheme.

scholarly journals High-speed Optical Wireless Communications

2014 ◽  
Author(s):  
Volker Jungickel ◽  
Jelena Vucic ◽  
Klaus-Dieter Langer
Keyword(s):  
Wireless Communications ◽  
High Speed ◽  
Optical Wireless ◽  
Optical Wireless Communications

scholarly journals Gallium nitride micro-light-emitting diode structured light sources for multi-modal optical wireless communications systems

2020 ◽  
Vol 378 (2169) ◽  
pp. 20190185 ◽  
Author(s):  
A. D. Griffiths ◽  
J. Herrnsdorf ◽  
J. J. D. McKendry ◽  
M. J. Strain ◽  
M. D. Dawson
Keyword(s):  
Gallium Nitride ◽  
Wireless Communications ◽  
Structured Light ◽  
Full Potential ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Light Emitting ◽  
Micro Scale ◽  
High Modulation ◽  
Led Array

Gallium nitride-based light-emitting diodes (LEDs) have revolutionized the lighting industry with their efficient generation of blue and green light. While broad-area (square millimetre) devices have become the dominant LED lighting technology, fabricating LEDs into micro-scale pixels (micro-LEDs) yields further advantages for optical wireless communications (OWC), and for the development of smart-lighting applications such as tracking and imaging. The smaller active areas of micro-LEDs result in high current density operation, providing high modulation bandwidths and increased optical power density. Fabricating micro-LEDs in array formats allows device layouts to be tailored for target applications and provides additional degrees of freedom for OWC systems. Temporal and spatial control is crucial to use the full potential of these micro-scale sources, and is achieved by bonding arrays to pitch-matched complementary metal-oxide-semiconductor control electronics. These compact, integrated chips operate as digital-to-light converters, providing optical signals from digital inputs. Applying the devices as projection systems allows structured light patterns to be used for tracking and self-location, while simultaneously providing space-division multiple access communication links. The high-speed nature of micro-LED array devices, combined with spatial and temporal control, allows many modes of operation for OWC providing complex functionality with chip-scale devices. This article is part of the theme issue ‘Optical wireless communication’.

Large Active Area, High-Speed Photoreceiver for Optical Wireless Communications

2018 ◽  
Author(s):  
T. Umezawa ◽  
K. Kusakata ◽  
A. Kanno ◽  
A. Matsumoto ◽  
N. Yamamoto ◽  
...  
Keyword(s):  
Wireless Communications ◽  
High Speed ◽  
Active Area ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Large Active Area

High-speed Optical Wireless Communications for Local Area Networks

2018 ◽  
Author(s):  
Ampalavanapillai Nirmalathas ◽  
Tian Liang ◽  
Sampath Edirisinghe ◽  
Christina Lim ◽  
Elaine Wong ◽  
...  
Keyword(s):  
Wireless Communications ◽  
High Speed ◽  
Local Area Networks ◽  
Local Area ◽  
Optical Wireless ◽  
Optical Wireless Communications

Submillimeter Large High-speed Photodetector for High Optical Alignment Robustness Optical Wireless Communications

2021 ◽  
Author(s):  
Toshimasa Umezawa ◽  
Shinya Nakajima ◽  
Atsushi Kanno ◽  
Naokatsu Yamamoto
Keyword(s):  
Wireless Communications ◽  
High Speed ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Optical Alignment
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