A Cost-Efficient RGB Laser-Based Visible Light Communication System by Incorporating Hybrid Wavelength and Polarization Division Multiplexing Schemes

Cai Xiang-Peng

doi:10.3389/fphy.2021.731405

Abstract

Visible light communication (VLC) has been proven a promising technology to counter the limitations of radio frequency (RF) communication technology such as high interference and high latency issues. VLC offers high bandwidth as well as immunity to interference from other electromagnetic spectrums. Due to these features, VLC can be an excellent solution for biomedical and healthcare applications for transmission of body sensor signals and other crucial patient information. In this work, a highly efficient VLC system is designed to transmit six channels, with each one carrying 10 Gbps of data, over a 500 m optical fiber link and a 200 cm VLC link. To make the VLC system cost effective, simple and efficient on-off keying (OOK) (non-return to zero) is used as the encoding scheme. Moreover, to further enhance the capacity and bandwidth of the proposed VLC system, hybrid wavelength division multiplexing (WDM) and polarization division multiplexing (PDM) schemes are incorporated by using red, green, and blue lasers. The reported results show the successful transmission of all channels (6 × 10 Gbps) over 500 m optical fiber and 200 cm of VLC link.

Highlights

Incessant demand of higher data rates and multifold user support in existing networks has forced researchers to look beyond radio frequencies (RF), which are bandwidth-limited, toward optical wireless systems (OWC) that offer nearly unlimited bandwidth (>400 THz) via mounting an infrared and ultraviolet region of the electromagnetic spectrum [1]
In 2020 [24], authors have demonstrated the transmission of 1.2 Gbps and 1.12 Gbps of data over a 3 and 4 m free space link by using dual polarized green and blue light-emitting diodes (LEDs)-based light streams
This section comprises the results from the modeling of the proposed wavelength division multiplexing (WDM)-polarization division multiplexing (PDM)-Visible light communication (VLC) link

Summary

Introduction

Incessant demand of higher data rates and multifold user support in existing networks has forced researchers to look beyond radio frequencies (RF), which are bandwidth-limited, toward optical wireless systems (OWC) that offer nearly unlimited bandwidth (>400 THz) via mounting an infrared and ultraviolet region of the electromagnetic spectrum [1]. Hu et al displayed a VLC link with the link range of 300 m by using a 650-nm laser diode and data rate of 10 Mbps [10]. Another group of researchers reported construction of a WDM-VLC system over a link range of 10 m using red and green lasers with a 500 Mbps data rate [11].

Results

Conclusion