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Recent Advances in Optical Injection Locking for Visible Light Communication Applications

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PHOTONICS
卷 10, 期 3, 页码 -

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MDPI
DOI: 10.3390/photonics10030291

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optical injection locking; visible light communication; laser diode; Li-Fi

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The introduction of visible light communication (VLC) technology can enhance the capacity of existing wireless communication systems for 6G networks by utilizing lighting system infrastructures. Semiconductor light sources such as LEDs and LDs play a crucial role in VLC technology due to their energy-efficiency and long lifespans. Various technologies including injection locking have been employed to achieve high-speed VLC links. This paper provides a comprehensive review on the implementation of the injection-locking technique in optical communication systems, elucidates the enhancement of characteristics through OIL, discusses the applications of OIL in VLC systems, and evaluates the prospects of OIL for future VLC systems.
The introduction of visible light communication (VLC) technology could increase the capacity of existing wireless communication systems towards 6G networks. In practice, VLC can make good use of lighting system infrastructures to transmit data using light fidelity (Li-Fi). The use of semiconductor light sources, including light-emitting diodes (LEDs) and laser diodes (LDs) are essential to VLC technology because these devices are energy-efficient and have long lifespans. To achieve high-speed VLC links, various technologies have been utilized, including injection locking. Optical injection locking (OIL) is an optical frequency and phase synchronization technique that has been implemented in semiconductor laser systems for performance enhancement. High-performance optoelectronic devices with narrow linewidth, wide tunable emission, large modulation bandwidth and high data transmission rates are desired for advanced VLC. Thus, the features of OIL could be promising for building high-performance VLC systems. In this paper, we present a comprehensive review of the implementation of the injection-locking technique in optical communication systems. The enhancement of characteristics through OIL is elucidated. The applications of OIL in VLC systems are discussed. The prospects of OIL for future VLC systems are evaluated.

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