Edison Christmas LED lighting is expected to implant LI-FI

German physicist Harald Haas (Haas) is a light bulb itself to lead whimsy. Haas and his team at the University of Edinburgh in the UK have developed a new patented technology to transmit digital information using flashing lights, a process known as visible light communication (VLC).

Herald Haas

Haas believes that by adding a microchip to the ordinary LED bulb, so that the light bulb at a very fast speed, you can use the light bulb to send data.

The basic idea is to encode information using the light and shade of light. Light source using a new era of high brightness light-emitting diode (LED), LED light, it means 1, out of the show that the 0. Haas claimed that by adding a microchip in any ordinary LED bulb, it can control the millions of times per second flash, because the frequency is too fast, the eye never noticed, but the light sensor can receive these changes. In this way, the binary data is quickly encoded into a light signal and transmitted efficiently. "It's like a Morse code sent by a torch, but it's a faster speed and a computer can understand the data.

Using LED to complete signal emission

The benefits of this technology are obvious: as long as you have a light bulb, you can get a wireless Internet connection. It is estimated that there are about 14 billion light bulbs around the world. Haas said his technology will be an important part of the problem, the width of the visible spectrum reached 10 thousand times the radio frequency spectrum. This means that visible light communication can bring higher bandwidth. Haas said that the realization of technology can bring up to 1Gbps of data transmission speed, much higher than the 4G network. In addition, the technology does not need to build new infrastructure.

People often call this technology as "Li-Fi", in order to show that it is possible to Wifi as the representative of the wireless network transmission technology may revolutionize.

Second page WIFI limitations increased LIFI complementary opportunities appear

The current wireless signal transmission equipment has many limitations, they are rare and expensive, but the efficiency is not high, such as mobile phone, now has 1 million 400 thousand base station responsible for the enhanced signal, but most of the energy is used in cooling efficiency, only 5%. By contrast, 40 billion of the world's bulbs are used, so they have higher efficiency. As long as the traditional incandescent lamp for the LED lamp, the bulb can be turned into a wireless network transmitter.

Global light bulbs may become LIFI

On the other hand, the radio itself has only a certain band, and only a small portion of the electromagnetic spectrum. For Wi-Fi, with the increasing demand for wireless connection ports in the future, the available bandwidth will be less and less. This problem is obvious in the cafe with wireless access to sit and watch as more and more people connect their devices to the internet. For mobile networks are also facing the same dilemma, 3G mobile network relies on an increasingly crowded about 1 million 400 thousand cellular radio mast system.

To solve these problems, Li-Fi technology is an effective solution. The visible spectrum is 10000 times larger than the radio spectrum, and the visible light spectrum is not used, it is not subject to regulation, which means that the transmission rate of wider bandwidth and higher speed using LI-FI can be as high as 1Gbps greatly reduces the time to download HD movies. In addition, unlike radio requires a large intensive energy array VLC does not require any new infrastructure.

Less developed countries easy to use LIFI

Page third wireless forbidden LIFI can run in both directions unblockedly

According to the principle of two-way communication, which means that the Li-Fi implanted LED need to have a photodetector to receive data. Experts point out that the hybrid system may also work: through the light to download data, and upload data using radio waves. For example, in an office, a LED table lamp can also be a "Li-Fi" router, it can connect any of the devices on the network has been connected.

Operating room is not suitable for WIFI

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