German Li-Fi equipment realizes LED lighting and lighting networking
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Wi-Fi wireless Internet access is already very common, and now there is another new option for Li-Fi to use LED lighting to transmit data for networking. Where there is light, wireless communication may be realized in the near future, bringing more convenience to people's lives.
German physicist Harald, who teaches at the University of Edinburgh in the United Kingdom. Haas made a report for the public, called my Li-Fi revolution. He said that Li-Fi lighting uses LED (Light Emitting Diode) illuminators to transmit data at very high frequency flickering pulses. Recent experiments have shown that monochrome 5 mW LED illuminators and receiving devices are at 1 and 10 meters. At the distance, the data transmission rate can reach 3.5Gbps and 1.1Gbps respectively (1bps is 1 bit per second), and the data transmission rate can be doubled by using different colors of light.
He also used LED lighting to illuminate the Internet receiving device and laptop to play a piece of online video data: if the light source is blocked, the computer can't access the Internet, the video stops playing; if the light is weakened in the direction of the light source, the computer can still access the Internet, but the data transmission The rate is slower, the video plays slower and there is a jam. Haas said this is because the receiving device is very sensitive to light intensity.
Based on the lighting technology, researchers at the University of Edinburgh have also developed solar-powered wireless Internet technology. Haas said that the solar cell Li-Fi receiving device can reach a data transmission rate of 7 Mbps, which is equivalent to the current data transmission rate of wireless Internet access. The solar panel can both provide energy for the optical signal receiving device and detect the network signal so that the data can be transmitted.
Haas said that solar-powered lighting technology can extend the reach of wireless networking, enabling wireless communications in remote areas, developing areas without network infrastructure, and in emergencies, opening up possibilities for a wide range of wireless communications applications.
He said that the advantages of the light Internet technology include radio wave interference, resources, security, energy saving and environmental protection, and reasonable price. The application fields are also very extensive, including indoor networks, sensor networks, intelligent traffic lights and medical services. .
Haas told Xinhua News Agency that the production of LED lighting and receiving equipment is still not big. At present, the United States, Japan, China and European countries are conducting research and development of LED wireless communication technology. He is also associated with researchers at Fudan University in China.
Li-Fi
Li-Fi is a brand new wireless data transmission technology, short for LightFidelity, by the German physicist Harald. Developed by Herald Haas. It transmits data by changing the blinking frequency of room lighting, and the data transmitted per second exceeds 10Mb, which is comparable to a typical broadband connection. That is to say, when the user turns on the room light, he also accesses the Internet. Use a wide range of spaces: hospitals, airports, military and even underwater.
The basic principle of Li-fi is to use light and dark to encode information. The light source adopts a new era of high-brightness light-emitting diode (LED). When the LED is on, it means 1, and when it is off, it means 0. Haas claims that by adding a microchip to any inconspicuous LED bulb, you can control it every time. Millions of times of flashing in seconds, because the frequency is too fast, the human eye will not notice it, but the light sensor can receive these changes. In this way, the binary data is quickly encoded into a light signal and transmitted efficiently. Haas explained: This is like a Morse code sent with a torch, but with data letters that can be understood at a faster speed and computer. This technology means that as long as you have a light bulb with an estimated 14 billion worldwide, you can access the wireless network. In practice, this means that any street light can also be used as a network base station. But VLC or Li-Fi is more than just improving the accessibility of the Internet. Source: China Industrial Economic Information Network