Fudan LED light Internet was questioned

Now accustomed to the wireless Internet, a wireless router installed in the home, outside the restaurant, shopping malls, stations, airports, public places generally have Wi-Fi signal coverage, so Wi-Fi technology is being fully popular. But have you ever thought, in the near future, Wi-Fi technology may be eliminated, you light up the light bulb, you can use the light on the internet.

A new technology to use the Internet, which is called "Li-Fi" (light), is being studied in many laboratories. Recently, Fudan University successfully completed an experiment, the network download speed in the light of 3.7G/ seconds, which also created a new world record.

In a laboratory at Fudan University, researchers will access a network signal 1W LED lamp light, the 4 computer can surf the Internet, in the experiment, the highest one-way transmission rate up to 3.7G per second, creating a field of visible light wireless communication one-way transmission speed record. In the experiment, the average speed of the real-time system is 150M, which can be called the world's fastest".

Chi Nan, Professor of information science and engineering at the Fudan University, who is in charge of the research project, told reporters that the light and radio waves, like a kind of electromagnetic wave, the basic principles of the spread of network signals are consistent. In the future, as long as any one of the LED bulbs in a microchip, you can make the bulb into a wireless network transmitter. If this technology can be applied on a large scale, it will be very convenient.

Chi Nan: the whole countries in the formulation of LED marketing strategy, so it's a huge market, if we can put up compatible lighting and communication, this is a very efficient means such as a remote rural area, or what the house has a bulb, not every home I have to you pull a cable in the past, but I have my lamp on the internet.

Xiang Ligang telecommunications experts have been concerned about the development of this field, in his view, there is no doubt that the bearing capacity of light waves is much more powerful than development, the equivalent of lights on the Internet has opened up a new channel of a data transmission.

Xiang Ligang: because we all know that the spectrum resource is a very limited resource, in fact it is a bit like our arable land is small, but we want to use the sea after the mountain, the sun is to play such a role, and light resources is very broad, from the big direction it is very promising.

At present, Japan, the United States and some European countries are active in the development of lighting technology, competition is very fierce. At the beginning of this year, Nan Nan had published a paper, when the transmission speed is 1.2G per second, to create a record, but soon, the record was broken in second months. Nan Nan said that compared with Wi-Fi, the benefits of Li-Fi are many, so countries are hoping to take the lead in making more achievements in the new technology sector accounted for the opportunity. For example, Wi-Fi increase speed will lead to an increase in electromagnetic radiation, which may pose a risk to human health, but Li-Fi does not exist this problem.

Chi Nan: Li-Fi no radiation, it is visible part of a natural spectrum inside, so human lighting all shone for thousands of years, unlike some of the microwave signal it has been very strong, you can't see it at all.

Chi Nan told reporters that this test is only used 3 1W beads, can pass 3 meters away, if the use of high-power lamp, the network signal will spread wider, faster, now the technology has reached 10 watt lamp can pass 15 meters, which means a few hundred square meters of office area only need to hang a chip inserted LED lamp in the central, can meet all the needs of the Internet. After the media reports of the Internet technology, many users seem to be excited, but also to give this technology Nan Nan poured a pot of cold water, in order to truly mass production applications, put in front of them there are two problems. The first is the two-way transmission of data, not only to download and upload the Internet, light irradiation on the computer easily, but the computer or mobile phone to install a large bulb to return data?

Nan: always have to come back, this constitutes a communication, I installed a large light bulb on the notebook feel very natural, so how do you solve the problem from my side and then spread to the light.

Another problem is the chip, which is the core of the problem. In Nan Nan's lab, she had two laptops so big, how to make them the size of a cell phone? This requires the development of chips. But research and development needs a lot of money, in the people already have the premise of Wi-Fi, what will not spend a lot of money to develop the Li-Fi chip? Nan Nan believes that the promotion of this technology, may also have to rely on the first application in a field, Li-Fi in order to really popular, there is still a long way to go.

Nan Nan: he may be the first breakthrough is a special field of industrial applications, such as Europe, which is placed in a large aircraft or secure communications, these areas may be the first application. But really to the popularity of thousands of households, may still have a period of time.

News: 1 watt LED lamp for computer access, the rate of 3.7G