Abstract: As a new generation of information technology, visible light communication not only expands the spectral resources for mobile telecommunication, but also has the characteristics of high speed, large capacity, security, and low energy consumption. The 5G and 6G technologies of wireless networks consume a great amount of energy, while light emitting diodes (LEDs) for lighting and display are everywhere, so visible light communication can be used to realize universal optical interconnection in the future. Although the bandwidth of fluorescent LED devices for commercial lighting is limited, the 3 dB bandwidth of visible light communication systems has been extended to 600 MHz through equalization technology, and the real-time communication rate of single on-off keying channels has been increased to 1.39 Gbps. If highorder modulation and wavelength division multiplexing technology are used, the total non- realtime communication rate of multi-color LED light sources can exceed 15 Gbps. Innovative applications such as visible light internet access, visible light positioning and smart home systems prove that the integration of visible light communication with lighting or displays is not a dream, and signify that visible optical wireless communication will bring about an even greater technological revolution.