scholarly journals Free-Space Optical Link Optimization in Visible Light Communication System

2021 ◽  
Author(s):  
Ngene Chidi Emmanuel ◽  
Prabhat Thakur ◽  
Ghanshyam Singh
Keyword(s):  
Visible Light ◽  
Communication System ◽  
Free Space ◽  
Light Emitting Diode ◽  
Software Tool ◽  
Visible Light Communication ◽  
Free Space Optical ◽  
Eye Diagram ◽  
Optical Link ◽  
System Properties

Abstract In this paper, a free-space optical link (FSOL) optimization in the visible light communication (VLC) is performed to improve the channel performance for signal strength and analysze the effect of signal failures in a communication system. The problem of uncertainty in the FSOL components for a better signal has prompted this study to check for an improved and enhance signal using bit error rate (BER) analyzer. The light emitting diode (LED) is used as a carrier for transmission of data as the optimization of system properties have concluded for limitations and working conditions. The noise has been added and removed to ascertain the channel behavior which in turn display an acceptable eye diagram for an improved signal. The acceptable eye diagram shows a better signal in the system. The optimization of FSOL will guarantee multi-mobile users of shared signal which will improve the signal errors, loss of power, weak signal, signal failure, loss of data etc. To fully characterize the FSOL, OptiSystem software tool has been used.

Design and Realization of 10Gbps DPSK System for Free Space Optical Communication

2012 ◽  
Vol 263-266 ◽  
pp. 1150-1155
Author(s):  
Gang Wu ◽  
Yan Gan Zhang ◽  
Xue Guang Yuan ◽  
Jin Nan Zhang ◽  
Ming Lun Zhang ◽  
...  
Keyword(s):  
Atmospheric Turbulence ◽  
Optical Communication ◽  
Communication System ◽  
Free Space ◽  
Error Probability ◽  
Transmission System ◽  
Free Space Optical Communication ◽  
Free Space Optical ◽  
Eye Diagram ◽  
Space Optical Communication

The performance of atmospheric communication system is limited by the atmospheric turbulence. In this paper, we present a practical 10Gbps DPSK transmission system for free space optical (FSO) communication with low error probability and wide-opening eye diagram. Compared to OOK modulation, DPSK format is a more effective way to resist the atmospheric turbulence. In addition, we designed parameters of this modulation system to be varied as the channel situation changed to achieve an optimized performance. The experiment results show that such a DPSK system could greatly overcome the atmospheric turbulence.

scholarly journals Analysis and Investigation of Dual-Polarized Color LED Based Visible Light Communication System

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 210
Author(s):  
Yun-Cheng Yang ◽  
Chien-Hung Yeh ◽  
Shien-Kuei Liaw ◽  
Chi-Wai Chow ◽  
Wei-Hung Hsu ◽  
...  
Keyword(s):  
Visible Light ◽  
Communication System ◽  
Light Wave ◽  
Light Emitting Diode ◽  
Visible Light Communication ◽  
Dual Polarization ◽  
Light Emitting ◽  
Data Capacity ◽  
Dual Polarized ◽  
Polarization Division Multiplexing

To increase the data capacity of a light-emitting diode (LED) based visible light communication (VLC) transmission, a polarization-division-multiplexing (PMD) green (G)- and blue (B)- light-based transmitter (Tx) module is demonstrated here. It was demonstrated that we can achieve 1200 and 1120 Mbps VLC capacities based on dual-polarized G- and a B-LED based light wave after 3 and 4 m free-space link lengths, respectively, at exceedingly low illuminance. Based on the presented VLC system, paired G-LEDs or B-LEDs with dual-polarization can also be applied on the VLC-Tx side for doubling and delivering VLC data. According to the obtained results, the largest polarization offset angle of 50° between two polarizers (POLs) can be allowed experimentally to provide optimal VLC traffic. Moreover, the relationships of polarization offset, the illuminance of LED and maximum achieved VLC capacity are also performed and analyzed.

Ultra-high-speed single red–green–blue light-emitting diode-based visible light communication system utilizing advanced modulation formats

2014 ◽  
Vol 12 (1) ◽  
pp. 010605-10608 ◽  
Author(s):  
Nan Chi Nan Chi ◽  
Yuanquan Wang Yuanquan Wang ◽  
Yiguang Wang Yiguang Wang ◽  
Xingxing Huang Xingxing Huang ◽  
Xiaoyuan Lu Xiaoyuan Lu
Keyword(s):  
Visible Light ◽  
Blue Light ◽  
Communication System ◽  
High Speed ◽  
Light Emitting Diode ◽  
Visible Light Communication ◽  
Modulation Formats ◽  
Light Emitting ◽  
Ultra High Speed ◽  
Advanced Modulation Formats
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