WIFI too LIFI has LED light to access the Internet

March 28, 2023

The most high-profile industry trend last week was the series of cooperation between Dongguan and Tsinghua University. Among them, the LED wireless optical communication project signed by Qinshang Optoelectronics and Tsinghua University has thrown a new term in front of the public. What is optical communication? What impact will it have on the LED industry in Dongguan?

LIFI instead of WIFI

Want to go online, have light. This kind of life may not be far away from us, but what is the relationship between the Internet and light? This is what optical communication needs to solve. As a "core" illumination, LED can have a design space for illumination and transmission.

"LED wireless optical communication is to transmit data information through LED lighting fixtures, and to transmit positioning information with position signals, to solve the problem that the spectrum extension of wireless communication cannot communicate and locate services in the limited area of microwave transmission." The introduction said, "that is, the light emitted by the LED replaces the WIFI to realize data and video image transmission."

Professor HaraldHaas of the University of Edinburgh in the United Kingdom used a LED desk lamp to transmit a video of flowers in the TED Global Open class for more than a year, showing the world the possibility of visible light transmission. People traditionally use radio waves to transmit data. HaraldHaas compares the spectrum of visible light and can use 10,000 times the range of radio waves.

So how can this part of visible light be applied to the transmission? The answer is LED, HaraldHaas introduced, because LEDs have sharper characteristics than ordinary incandescent lamps and fluorescent lamps, and can adjust brightness at high speed. He further introduced in the open class that the infrared application of the remote control transmits a simple, low-speed data stream and transmits 100,000 data streams per second, which is not enough for the Internet.

What he did was to develop a new technology that uses visible light to transmit a larger stream of data, such as the video he demonstrated, which has only a very small effect on the brightness of a desk lamp. Let light transmission have the possibility of becoming LIFI. Imagine that Dongguan is all replaced with LED street lights , and more and more LEDs are used in homes. In addition to energy saving, this kind of lighting can also provide information services in places where there is light.

Tsinghua R&D is industrialized in Dongguan

"The LED chip used in visible light communication should be different from the current purely illuminated chip, and needs to be redesigned and modified." Shi Guangdian, deputy general manager of Shen Laite Optoelectronics, predicts that visible light communication may bring new situation of LED and new market demand.

In fact, such a communication method, as early as 2000, has been analyzed and studied by Japanese scientists. However, according to Wei Shaojun, director of the China Semiconductor Industry Association's IC-related branch and director of the Institute of Microelectronics at Tsinghua University, this project is a new field in the world, and the country is also in the process of research and development. To put it bluntly, there are still many hills waiting for the occupation.

This project is applied in the municipal industry. LED optical communication products can be used for traffic guidance and positioning. In the automotive industry, LED optical communication products can be used for communication between vehicles, car collision avoidance and assisted driving when the car is in use; LIFI can be used instead of WIFI wireless communication and so on.

The person in charge of Qinshang Optoelectronics said, "LED wireless optical communication will greatly enhance the added value of the LED lighting industry technology. It is conservatively expected that each industry will at least pull the market of billions of dollars." At present, Diligence and Tsinghua have conducted LED visible light. The technology research and development of the positioning system and the communication system and the cooperation of industry, university and research institutes, and form a consortium to jointly declare the special fund project of the Guangdong Province Industry-University-Research Cooperation in 2013.

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Biased, LED or new world

At the beginning of the month, Shenzhen abolished the LED industry planning. This move is a bad news for the LED lighting industry, which was originally overcapacity. At this time, Dongguan not only insisted on the direction of the LED industry, but also Qinshang Optoelectronics and Tsinghua University signed the "Memorandum of Further Research Cooperation in the Field of Optical Communications". The industry believes that it is an initiative to take a new battlefield.

"LED chip technology is mastered by foreign countries, so many domestic LED manufacturing industries are simply re-production and packaging, and low-level repetitive labor profits are very low." Wei Shaojun believes that research teams and entrepreneurs are all time to look for differentiated development. "Be biased, or have a new world."

Optical communication will be a new field of LED chips. Wei Shaojun learned that there are not many institutions in the country that have the ability and practice to conduct optical communication research. The company has reached consensus with Tsinghua University on technical research and product development, and strives to become an industrialization base for national science and technology projects such as the 973 Program and the 863 Program in the field of optical communications. However, any new technology has development risks, such as poor industrialization results, or such as the photovoltaic industry, because of the swarming of local areas, resulting in the final consumption of support, overcapacity. Wei Shaojun believes that LED optical communication must also prevent a swarm of bees, but Dongguan can see its prospects when the industry has just emerged in China, and build a production, study and research framework to do research and development. This point: "Dongguan is very visionary. ”

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