British researchers invent visible light transmission data technology to be difficult to apply

Are you still complaining that WiFi hotspots are too low and the signal is unstable? In the future, you will have a wireless network signal, and the transmission speed can be as high as 1Gbps far higher than WiFi. The technology, developed by Herald Haas, a University of British scientists and his team, uses a beam of light to transmit data that is often called http://www.aliyun.com/zixun/aggregation/33631.html "> Visible optical Communication (VLC). However, there is no barrier to implementing the technology. First, the visible light cannot penetrate the object, so the signal is cut off. In addition, how the handset receives the optical communication information, is also a difficult problem.

LED light bulb with microchip transfer data

According to foreign media reports, Haas said his biggest dream is to turn the light bulb into a broadband communications device. This light bulb not only provides illumination, but also becomes a necessary tool. Haas that by adding microchips to ordinary LED bulbs so that the bulbs blink at a very fast rate, the light bulb can be used to send data.

The bulb flashes at a frequency of millions of times per second, which is invisible to the human eye, and can only be detected by a photosensitive receiver. In this way, LED bulbs can quickly transmit binary code.

The benefits of this technology are obvious: as long as you have a light bulb around you, you can get a wireless internet connection. It is estimated that the number of light bulbs in the world is about 14 billion.

Up to 1Gbps transmission speed

This visible-light communication technology is referred to as "LiFi", its advantage not only can make any street lights in the world become Internet access point, also can save the increasingly scarce radio frequency spectrum resources. Currently, WiFi uses the RF signal as the main technology for wireless data transmission. However, radio waves account for only a small portion of the entire electromagnetic spectrum. But with the increase in demand for wireless internet users, the frequency spectrum available is getting smaller.

That's why when you're around the Internet more and more people, your speed will become more and more slow. 3G wireless networks are the same as WiFi networks. According to Facebook founder and CEO Mark Zuckerberg, the amount of information that people will share in the next 10 years is about 1000 times times Zuckerberg.

Haas says his technology will be an important part of the problem, "the spectrum of visible light is 10,000 times times the width of the RF spectrum." "This means that visible light communications can lead to higher bandwidth. Haas says the "LiFi" technology can deliver up to 1Gbps of data transfer speeds, much higher than 4G networks. In addition, the technology has little need for new infrastructure.

Three major hurdles are needed to achieve this technology

Will the phone soon be able to use LiFi? Not！ Although the technology has unparalleled advantages, its flaws are equally obvious. Technical sources say that visible light cannot penetrate objects, so if the receiver is blocked, the signal will be cut off. At the same time, mobile phones, tablets and other devices how to accept the visible light communication signals, stability, there is no conclusion. In addition, 14 billion lights, looks like 14 billion hot spots, both indoor and outdoor, but the security is worrying.

Haas that the visible optical communication is not a Wi-Fi competitor, but rather a complementary technology. If the optical signal is blocked, and the user needs to use the device to send information, you can seamlessly switch to the RF signal.

He says users still need WiFi RF communication systems. In the short term, visible optical communications may be able to implement some applications in small areas-under water, oil drilling, or in aircraft compartments.

(Responsible editor: The good of the Legacy)