Abstract
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.
Highlights
Electromagnetic waves have an extensive range of applications, including cell phone communications, wireless radio broadcast, Wi-Fi, etc
In 2015, Chi et al illustrated a blue laser diodes (LDs)-based white light converted by a phosphorous diffuser, with a correlated color temperature (CCT) of 5217K, which can transmit 16-QAM orthogonal frequencydivision multiplexing (OFDM) data at a data rate of
Lin et al achieved beyond 5 Gbit/s optical wireless communication (OWC) with a 2 × 2 high-contrast grating (HCG) green μ-Light-emitting diodes (LEDs) operated under low current density, decreasing the power consumption of the transmission system [137]
Summary
Electromagnetic waves have an extensive range of applications, including cell phone communications, wireless radio broadcast, Wi-Fi, etc. Reached a data rate of 1 Gbit/s with a phosphorescent white LED by the utilization of a DMT modulation scheme [13]. Laser diodes (LDs) are another light source often employed in VLC systems They have stronger coherence, narrower spectral linewidth, and larger modulation bandwidth, making them more suited for data rates exceeding Gbit/s [18,19]. To increase the data rate, in 2013, Chi et al achieved 9 Gbit/s VLC in a 5 m point-to-point (PtP) free space link by utilizing 64-QAM OFDM to modulate a GaN blue LD [22]. In 2015, Chi et al illustrated a blue LD-based white light converted by a phosphorous diffuser, with a correlated color temperature (CCT) of 5217K, which can transmit 16-QAM OFDM data at a data rate of.
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