New applications of LED lighting: visible light communication

Interviewed experts: GSC visible communications project leader Dr. Luo Jianghua

The development of the short circuit board

Japan in 2003 on the establishment of visible light Communications Alliance (VLCC, 2014, VLCC renamed VLCA) on visible light communication research scope is relatively broad, according to the specific application scenario can be divided into indoor mobile communication, visible light positioning, visible light wireless LAN access, traffic lights, underwater communication of visible light communication. In 2008, the EU set up home Gigabit access plan (OMEGA), OMEGA plans to visible light communication technology as one of the important technology of high-speed access, and has achieved fruitful results. The United States UC-Light, ERCCOWA is an important institution in the world of visible light communication research, mainly studies the LED lighting high-speed communication and positioning system, real-time transmission of 2014 has been able to achieve ten meters of high-definition video and data signals. At present, foreign visible light communication industry is in the key period of research and commercialization, and a number of Companies in different applications to carry out the commercial application of visible light communication pilot.

In general, the current commercial system of visible light communication abroad is still limited to modular products, no chip level reports. Visible light communication technology in China is now in the research and development stage. China has carried out a number of visible light communication research, research in this field in recent years in science, Fudan University, Southeast University, Jinan University and The PLA Information Engineering University as the representative of the R & D team have made a major breakthrough. "13th Five-Year" period, Guangdong province is to increase the visible light communication industry's efforts to promote industrial restructuring and upgrading LED.

Compared to Europe, Chinese visible light communication technology industrialization work despite the relatively lag, but with the national and local government efforts to support the development of visible light communication technology industry, has been formed to promote the application of visible light communication technology market power, realize the industrialization of the future development of visible light communication technology becomes mature.

Compared to Europe and the United States, China's visible light communication is lagging behind

In the existing stage of industrialization of visible light, the launch of optoelectronic chips has become a more restrictive factor. At present, the modulation bandwidth of white LED chip is very limited, especially in the mainstream of the market, the main products of the blue light yellow phosphor LED.

Currently on the market mainstream LED bandwidth of less than 20MHz, a serious impact on the improvement of the capacity of the visible light communication system (10dB). For receiving the photoelectric chip, silicon detector chip is widely used for visible light communication, mainly in the infrared sensitive light efficiency is low; in the LED visible light communication system, there is a strong interference background inherent noise and circuit noise, as the transmission distance increases, the signal received by the receiver is weak, it will also affect the peak transmission rate. Due to the emergence of visible light communication, it is still a blank for this new communication system.

The transmitter of the visible light communication system needs the beam shaping optical system, the receiving end needs the high efficiency light gathering system, the huge optical lens group adds the difficulty to the system integration. The technology of visible light communication industry key, can be formed from the receiving optical antenna, transceiver chip, photoelectric control chip, communication transceiver chip, and the future of the visible light communication network, from materials, chips, modules of the system, the entire network of vertical industry chain.