In the safety limbo: Simultaneous illumination and optical wireless communications with light-emitting diodes

2009 ◽  
Author(s):  
Werner Horak ◽  
Joachim W. Walewski
Keyword(s):  
Wireless Communications ◽  
Light Emitting Diodes ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Light Emitting

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’.

scholarly journals Light-Emitting Commutating Diodes for Optical Wireless Communications Within LED Drivers

2020 ◽  
Vol 12 (5) ◽  
pp. 1-11
Author(s):  
Warren Pawlikowski ◽  
Alireza Barmaki ◽  
Mehdi Narimani ◽  
Steve Hranilovic
Keyword(s):  
Wireless Communications ◽  
Optical Wireless ◽  
Optical Wireless Communications ◽  
Light Emitting ◽  
Led Drivers

scholarly journals Investigation of the Scattering Noise in Underwater Optical Wireless Communications

Sci ◽  
2021 ◽  
Vol 3 (2) ◽  
pp. 27
Author(s):  
Behnaz Majlesein ◽  
Asghar Gholami ◽  
Zabih Ghassemlooy
Keyword(s):  
Wireless Communications ◽  
Optical Wireless ◽  
Clear Water ◽  
Optical Wireless Communications ◽  
Channel Bandwidth ◽  
Phase Variations ◽  
Transmission Link ◽  
Channel Dependent ◽  
First Time ◽  
Scattering Noise

In underwater optical wireless communications (UOWC), scattering of the propagating light beam results in both intensity and phase variations, which limit the transmission link range and channel bandwidth, respectively. Scattering of photons while propagating through the channel is a random process, which results in the channel-dependent scattering noise. In this work, we introduce for the first time an analytical model for this noise and investigate its effect on the bit error rate performance of the UOWC system for three types of waters and a range of transmission link spans. We show that, for a short range of un-clear water or a longer range of clear water, the number of photons experiencing scattering is high, thus leading to the increased scattering noise. The results demonstrate that the FEC limit of 3×10−3 and considering the scattering noise, the maximum link spans are 51.5, 20, and 4.6 m for the clear, coastal, and harbor waters, respectively.

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