scholarly journals Visible Light Communication System Technology Review: Devices, Architectures, and Applications

Crystals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1098
Author(s):  
Tai-Cheng Yu ◽  
Wei-Ta Huang ◽  
Wei-Bin Lee ◽  
Chi-Wai Chow ◽  
Shu-Wei Chang ◽  
...  
Keyword(s):  
Visible Light ◽  
Secure Communication ◽  
High Speed ◽  
Stark Effect ◽  
Visible Light Communication ◽  
Optimal Choice ◽  
Light Sources ◽  
Modulation Bandwidth ◽  
High Data ◽  
Wide Range

Visible light communication (VLC) is an advanced, highly developed optical wireless communication (OWC) technology that can simultaneously provide lighting and high-speed wireless data transmission. A VLC system has several key advantages: ultra-high data rate, secure communication channels, and a lack of interference from electromagnetic (EM) waves, which enable a wide range of applications. Light-emitting diodes (LEDs) have been considered the optimal choice for VLC systems since they can provide excellent illumination performance. However, the quantum confinement Stark effect (QCSE), crystal orientation, carrier lifetime, and recombination factor will influence the modulation bandwidth, and the transmission performance is severely limited. To solve the insufficient modulation bandwidth, micro-LEDs (μ-LEDs) and laser diodes (LDs) are considered as new ideal light sources. Additionally, the development of modulation technology has dramatically increased the transmission capacity of the system. The performance of the VLC system is briefly discussed in this review article, as well as some of its prospective applications in the realms of the industrial Internet of Things (IoT), vehicle communications, and underwater wireless network applications.

High-speed micro-LEDs for visible light communication: challenges and progresses

2021 ◽  
Author(s):  
Luming Yu ◽  
Lai Wang ◽  
Zhibiao Hao ◽  
Yi Luo ◽  
Changzheng Sun ◽  
...  
Keyword(s):  
Wireless Communication ◽  
Visible Light ◽  
High Speed ◽  
Visible Light Communication ◽  
Future Research ◽  
Light Sources ◽  
Modulation Bandwidth ◽  
Existing Problems ◽  
Communication Challenges

Abstract Due to spectrum shortage, visible light communication (VLC) has gradually been regarded as an important alternative and reinforcement in wireless communication field. Micro-LEDs are ideal high-speed light sources for VLC due to its significantly improved modulation bandwidth. In this review, the developments of high-speed micro-LEDs in VLC are discussed. While expounding the unique advantages of micro-LED, we also point out the existing problems and challenges. On this basis, we review the outstanding achievements in bandwidth improvement, and also look forward to some promising directions for future research.

scholarly journals Polymer colour converter with very high modulation bandwidth for visible light communications

2017 ◽  
Vol 5 (35) ◽  
pp. 8916-8920 ◽  
Author(s):  
D. A. Vithanage ◽  
A. L. Kanibolotsky ◽  
S. Rajbhandari ◽  
P. P. Manousiadis ◽  
M. T. Sajjad ◽  
...  
Keyword(s):  
Visible Light ◽  
High Speed ◽  
Visible Light Communication ◽  
Modulation Bandwidth ◽  
Visible Light Communications ◽  
Semiconducting Polymer ◽  
High Modulation ◽  
Very High

We report the synthesis, photophysics and application of a novel semiconducting polymer as a colour converter for high speed visible light communication.

Modulation and Demodulation Techniques in Indoor Visible Light Communication System

2014 ◽  
Vol 685 ◽  
pp. 306-309
Author(s):  
Hao Wang ◽  
Ze Yu Han
Keyword(s):  
Visible Light ◽  
Communication Technology ◽  
Communication System ◽  
High Speed ◽  
Data Transfer ◽  
Visible Light Communication ◽  
Communication Link ◽  
High Data ◽  
Modulation And Demodulation ◽  
The Impact

Visible light communication technology is a emerging wireless and optical communication technology developed after invention and application of white LED.In this paper, we have a research based on indoor visible light communication system of lighting white LED,discuss of the visible light communication channel characteristics,detailedly analysis of the indoor visible light communication link. This paper focuses on the modulation and demodulation method applied to visible light communication. In the past visible light communication is mainly used off keying modulation,however, the data transfer speed is limited due to the influence of ISI .This paper presents a solution based on OFDM modulation and demodulation, to reduce the impact brought from inter-symbol string under high data transfer speed.Based on data analysis and computer simulation,the program presented in this paper can be used as indoor lighting and high-speed data transmission.Finally, give scheme to achieve visible light communication modulation and demodulation,provide a theoretical basis for further experiments.

Analysis of InGaN Multiple-Quantum-Well Photoelectric Device of Visible Light Communication

2020 ◽  
Vol 15 (7) ◽  
pp. 909-916
Author(s):  
Haitao Chi ◽  
Yu Du ◽  
Gongyu Li
Keyword(s):  
Quantum Well ◽  
Visible Light ◽  
High Speed ◽  
Visible Light Communication ◽  
Multiple Quantum ◽  
Modulation Bandwidth ◽  
Carrier Distribution ◽  
Photoelectric Device ◽  
Electron Leakage ◽  
Modulation Speed

The key to achieving high-speed and high-quality visible light communication is to increase the modulation speed of Light-Emitting Diode (LED). Therefore, in this study, the influence of the Composite Mechanism of Carrier (CMC) on the modulation speed of LED is studied by designing different structures of the InGaN Multi-quantum-well (MQW) LED active region. Because the carrier subspace waves function of narrow quantum well LED overlaps more frequently and the electron leakage effect is more significant, the compound rate is faster and the modulation bandwidth is higher. InGaN quantum barrier LED with a content of 1% can increase the weight of radiation recombination, which makes the modulation bandwidth higher than GaN quantum barrier LEDs; when the in content is 5%, electron leakage and Auger recombination have a dominant position. Moreover, because these two compounding mechanisms have a fast compounding rate, the modulation bandwidth is significantly increased. Then the 405 nm laser-excited photoluminescence (PL) is introduced to analyze the carrier dynamics in the LED and obtain the related processes of carrier distribution and transport. The proposed carrier microscopic model can well explain change characteristics of the PL luminescence peak, luminous intensity, and half-height width of InGaN/GaN MQW LED with different excitation wavelengths. At low temperature, the PL peak of the InGaN/GaN quantum well LED redshifts with the increase of temperature, because the weakly bound carrier transfers the obtained energy to the deeply bound energy level of high In content.

scholarly journals An Architecture Design of Auto Channel Switching Unit for Hybrid Visible Light Communication System

2021 ◽  
pp. 522-527
Author(s):  
Rao Kashif ◽  
◽  
Fujiang Lin ◽  
Oluwole John Famoriji ◽  
Shahzad Haider
Keyword(s):  
Wireless Communication ◽  
Visible Light ◽  
Secure Communication ◽  
High Speed ◽  
Visible Light Communication ◽  
Hybrid Network ◽  
Channel Switching ◽  
Current Standard ◽  
Switching Unit ◽  
Indoor Wireless

The revolution in multimedia devices has promoted indoor wireless communication in the last decades. Wireless fidelity (Wi-Fi) connections have expanded rapidly, and more than 5 billion devices have been connected to Wi-Fi each day since 2013, which causes system overloading. This bountiful usage of wireless devices has consumed an excessive amount of the radio spectrum, and the current standard for wireless communication is not able to provide enough capacity for indoor wireless traffic in the next decade. Wi-Fi currently holds 60% of the global traffic; however, secure communication for the internet of things (IoT) and spectrum congestion are two significant challenges for future communication development. Therefore, an affordable, secure, and fast medium for wireless communication is in urgent demand. It should be noted that the spectrum provided by visible light communication (VLC) can be thousands of times wider than the radio frequency (RF) spectrum. The challenge of spectrum congestion and the urgent demand for a high-speed medium can be solved through the application of visible light for indoor communication. It has been proved that each user can achieve a data rate of hundreds of Mbps in the congestion scenario through the application of VLC. But beside these advantages Li-Fi also have some limitations like unavailability in excess and in low light and also limited coverage due to walls and etc. To overcome these limitations the Wi-Fi and VLC hybrid network can be a good solution to continue using privileges of both technologies. A lot of research has been done to introduce a numerous techniques for such hybrid network but we are proposing Auto channel switching unit in this system which will be responsible for shifting and sharing data traffic on both Li-Fi and Wi-Fi channel.

scholarly journals About Digital Communication Methods for Visible Light Communication

2021 ◽  
Vol 13 (03) ◽  
pp. 01-13
Author(s):  
Wataru Uemura ◽  
Yasuhiro Fukumori ◽  
Takato Hayama
Keyword(s):  
Visible Light ◽  
High Speed ◽  
Pulse Wave ◽  
Low Voltage ◽  
Threshold Value ◽  
Visible Light Communication ◽  
Wave Modulation ◽  
Wide Range ◽  
Pulse Wave Modulation ◽  
Communication Methods

The visible light communication (VLC) by LED is one of the important communication methods because LED can work as high speed and VLC sends the information by high flushing LED. We use the pulse wave modulation for the VLC with LED because LED can be controlled easily by the microcontroller, which has the digital output pins. At the pulse wave modulation, deciding the high and low voltage by the middle voltage when the receiving signal level is amplified is equal to deciding it by the threshold voltage without amplification. In this paper, we proposed two methods that adjust the threshold value using counting the slot number and measuring the signal level. The number of signal slots is constant per one symbol when we use Pulse Position Modulation (PPM). If the number of received signal slots per one symbol time is less than the theoretical value, that means the threshold value is higher than the optimal value. If it is more than the theoretical value, that means the threshold value is lower. So, we can adjust the threshold value using the number of received signal slots. At the second proposed method, the average received signal level is not equal to the signal level because there is a ratio between the number of high slots and low slots. So, we can calculate the threshold value from the average received signal level and the slot ratio. Unfortunately, the first proposed method adjusts the threshold value after receiving the data, once the distance between the sender and the receiver is changed, then the performance becomes worse. And after adjusting the threshold, the performance becomes better. Therefore, this method should be used in stable environments. The second proposed method can change the threshold value during the signal is received. That means this method can work very quickly. So, this method can show good performance for the wide range. We show these performances as real experiments.

scholarly journals An LED-based visible light communication system for multicast

2019 ◽  
Vol 13 (1) ◽  
pp. 265
Author(s):  
Jong-Sung Lee ◽  
Dae-Hee Lee ◽  
Sung-Jin Kim ◽  
Chang-Heon Oh
Keyword(s):  
Internet Of Things ◽  
Visible Light ◽  
Data Transmission ◽  
Communication System ◽  
High Speed ◽  
Visible Light Communication ◽  
Experimental Results ◽  
Light Sources ◽  
Broadcast Communication ◽  
Communication Method

<p>Visible Light Communication is a communication method that transmits data through light by pulsing an LED at high speed, performing broadcast communication for all devices existing in its coverage. Broadcast-based Visible Light Communication is limited to application to Internet of Things services, where various applications exist, although all receivers can communicate within the range of light sources. Therefore, this paper proposes an LED based Visible Light Communication system for multicast. The proposed system performs individual multicast by participating in communication only with receivers configured to use a specified ID value input at the transmitting side during data transmission. Experimental results show that the receiver can receive files individually according to a specified ID value.</p>

scholarly journals Advanced Modulation Format of Probabilistic Shaping Bit Loading for 450-nm GaN Laser Diode based Visible Light Communication

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6143
Author(s):  
Guoqiang Li ◽  
Fangchen Hu ◽  
Peng Zou ◽  
Chaofan Wang ◽  
Gong-Ru Lin ◽  
...  
Keyword(s):  
Visible Light ◽  
Laser Diode ◽  
High Speed ◽  
Signal To Noise Ratio ◽  
Visible Light Communication ◽  
System Capacity ◽  
High Data ◽  
Modulation Format ◽  
Bit Loading ◽  
Power Loading

Visible light communication is an emerging high-speed optical wireless communication technology that can be a candidate to alleviate pressure on conventional radio frequency-based technology. In this paper, for the first time, the advanced modulation format of probabilistic shaping (PS) bit loading is investigated in a high data rate visible light communication system based on a 450-nm Gallium Nitride laser diode. The characteristic of the system is discussed and PS bit loading discrete multi-tone modulation helps to raise the spectral efficiency and improve the system performance. Higher entropy can be achieved in the same signal-to-noise ratio (SNR) and modulation bandwidth limitation, comparing to bit and power loading. With PS bit loading, an available information rate (AIR) of 10.23 Gbps is successfully achieved at the signal bandwidth of 1.5 GHz in a 1.2 m free space transmission with normalized generalized mutual information above 0.92. And higher AIR can be anticipated with an entropy-loading strategy that fixes the channel characteristic. Experimental results validate that a PS bit loading scheme has the potential to increase the system capacity.

scholarly journals Micro-LED as a Promising Candidate for High-Speed Visible Light Communication

2020 ◽  
Vol 10 (20) ◽  
pp. 7384
Author(s):  
Konthoujam James Singh ◽  
Yu-Ming Huang ◽  
Tanveer Ahmed ◽  
An-Chen Liu ◽  
Sung-Wen Huang Chen ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Visible Light ◽  
High Speed ◽  
Review Paper ◽  
Visible Light Communication ◽  
Low Power Consumption ◽  
Active Layer Thickness ◽  
Modulation Bandwidth ◽  
Recombination Time

Visible Light Communication (VLC) technology is an emerging technology using visible light modulation that, in the modern world, will mainly facilitate high-speed internet connectivity. VLC provides tremendous advantages compared to conventional radio frequency, such as a higher transmission rate, high bandwidth, low-power consumption, no health hazards, less interference, etc., which make it more prominent in recent days. Due to their outstanding features, including low cost, low power consumption, etc., µ-light-emitting diodes (LEDs) have gained considerable attention for VLC implementation, but mostly for the ability to be used for lighting as well as communications. In this review paper, we will focus mainly on recent developments in VLC applications and various factors affecting the modulation bandwidth of VLC devices. Numerous factors, such as quantum confined stark effect (QCSE), carrier lifetime, carrier recombination time, crystal orientation, etc. affect the modulation bandwidth of LEDs, and more information will be discussed in the following sections. This paper will focus on VLC applications based on LEDs but mainly on semipolar μ-LEDs and μ-LED-based arrays with high bandwidths. Another important application of VLC is underwater optical wireless communication (UOWC), which has drawn a huge interest in marine exploration and underwater connectivity, but still faces some challenges because visible light is being used. In addition, this paper will focus on how the current VLC system modulation bandwidth can be enhanced. Many methods have been introduced, such as decreasing the active layer thickness or effective active area or using doping, but the bandwidth is restricted by the recombination time when the system configuration reaches its limit. Therefore, it is important to find alternative ways such as optimizing the system, using the blue filter or using the equalization technology, which will be addressed later. Overall, this review paper provides a brief overview of the VLC-based system performance and some of its potential prospects.

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