Research on Ultra-High-Speed Satellite Visible Light Laser Communication Technology(Invited)
Visible light communication(VLC)has gradually become a research hotspot in satellite communication owing to its significant advantages.For example,VLC provides rich and unlicensed spectrum resources,high transmission rates,strong security,and resistance to electromagnetic interference.Laser VLC devices exhibit high emission power,strong resistance to radiation,and a narrow laser beam divergence angle and are expected to be used in high-capacity long-distance satellite communication link transmissions.In this study,we implement an integrated 40-channel wavelength division multiplexing(WDM)laser VLC system,utilizing 29 visible light wavelengths.The system employs discrete multi-tone(DMT)bit loading modulation and the Levin-Campello(LC)algorithm,achieving a total transmission data rate of 418.3 Gbit/s.To the best of our knowledge,this represents the highest data rate achieved in laser VLC using WDM to date.To address the issues of bandwidth limitation and high-frequency fading in laser VLC systems,this system employs digital pre-equalization technology.Based on the signal characteristics of the system,a corresponding Zobel network is designed to enhance and reduce the energy of high-frequency and low-frequency signals,respectively,thereby improving the overall communication performance.The experimental results reveal that digital pre-equalization significantly enhances the laser VLC performance.This system demonstrates the significant potential of laser VLC in high-capacity satellite communication.
wavelength division multiplexinglaser communicationvisible light communicationsatellite communication
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