1 watt LED light to allow computers to access the Internet, the highest rate of 3.7G

Fudan lab, the speed of the realization of the wireless sensor network prototype is demonstrating Internet

October 16th, the reporter in the school of information science and engineering, Fudan University laboratory experience this kind of called "LiFi" (LightFidelity) of the new technology. A 1 watt LED light irradiation, the cartoon is being shown in the notebook computer, when a reporter with the palm of the hand blocking the light, stop the cartoon show, the reporter with the hand out of the light down, cartoons from time to time stuck...... Does this light can also run around the computer? The answer is: the computer is playing online video, and the computer is the secret of the Internet in the light of the LED.

In fact, just the day before yesterday, Fudan researchers will light up the highest rate of offline refresh to 3.7G, the average speed of real-time systems to reach 150M, creating a world record. Next month, the 10 prototype will be unveiled in 2013 Shanghai industrial fair.

Millions of flashes per second

Yesterday, the reporter went to the school of information science and Engineering Laboratory, Fudan University, on-site experience of the light on the whole process. The reporter saw, two groups of LED lamp is respectively installed at the transmitter and receiver, and connected on a laptop computer. Reporters will be blocking the palm of the LED light, as expected, the laptop is being played on the network interruption of the animation, when the reporter removed the palm of the hand, the animation continues to play.

Fudan School of information science and engineering professor Chi Nan said the mystery in this set of special launch, receiving device. "Light and radio waves, like a kind of electromagnetic wave, the basic principles of the spread of network signals are consistent. In the study, the LED will be converted into the current through the transmitter into the current balance, control it millions of times per second flashing, lit 1, out of the representative of the 0. In this way, LED bulbs can be quickly transmitted binary code. As a result, the computer will be able to read the light hidden in the password to achieve the light on the internet".

It is reported that the light on the Internet from the University of Edinburgh physicist Haas, he in 2011 in the United States on a television show to the public to demonstrate his light Internet equipment. Last year, the Shanghai Municipal Science and Technology Commission in the city's universities and research institutes in the layout of the international forefront of wireless communications technology, by Professor Su Nan as the head of the project. After less than a year of efforts, the research group has made important progress in the research and application of key technology of visible light communication: researchers not only use visible light signal transmission network in the laboratory environment, and can realize the "one to four", lit up a 1 watt lamp, 4 computer to the Internet, interpenetrating network signal.

The key lies in the microchip industry

Chi Nan introduction, and now the most needed to capture the task force, is how to fill the circuit and a variety of devices to reduce the transmitter receiver narrowing, and finally put into a chip. Haas, the inventor of the technology, suggested that the LED could be sent to a bulb by installing a microchip.

"Now, from the lighting communication control chip design to manufacture a series of key technology products, is the researchers" hands-on ", there is no commercial chipset, to really enter thousands of households like WiFi, through a series of industrial development, there is a long way to go. Late Nan said.

In recent years, visible light communication has become the field of international communication research, the United States, Europe, Japan and other countries of communication researchers, are competing for research. The focus of everyone's PK is: "the speed of the Internet". At the beginning of this year, the late Nan group has just published a visible light transmission rate in 1.5G research results, will soon be refreshed, almost every month in a new article". Just the day before yesterday, the school of information science and engineering, Fudan University, the laboratory and refresh the world record: the light on the Internet, the highest rate of offline refresh to 3.7G, real-time system average internet access rate of 150M.