LED optical wireless network: as long as the lights on the Internet

Key words for future cities in 2050: digital life. This is a way of life based on the Internet and a series of digital technology applications, can be convenient and quick to give people a better life experience and work convenience.

In the time of Columbo's navigation, the world suddenly became very big. After the advent of the computer and the Internet, the world began to become smaller. With the popularization of Internet technology, the way of human life begins to change. The earth seems to have become "smart" overnight, even the goods have a "thought".

Only in this way, in the future of the rapid development of science and technology in 2050, no matter what kind of equipment can be used at any time, any place by means of wireless data transmission. LED optical wireless network popularization, promote the development of the Internet of things, the whole world easily associated......

Nowadays, people are accustomed to wireless internet. Without the shackles of the cable, we can enjoy the fun of surfing the internet. However, because of the obstruction of objects such as walls, some places in the room will not be able to receive the signal or the signal is very weak. So, scientists imagine, why not let the light to send a signal as long as the light is on, do not worry about not online.

This seemingly powerful idea has now become a reality. At the China Aviation Museum in Shanghai, World Expo, scientists at the Institute of semiconductors, Chinese Academy of Sciences, have demonstrated the latest and most innovative results: LED optical wireless networks......

According to the optical cable network and the principle of light media flashing signal

The LED lamp is switched on at a very high frequency, and the signal is sent out when the light flashes. This high frequency flicker is imperceptible to the human eye, so the LED lights can be lit, the signal two.

In the exhibition hall of the LED optical wireless network of the Aviation Museum, a beam of light shines on a laptop computer, the staff in the light of free Internet surfing. This is the LED optical wireless network - the light emitted by the LED lamp as a network signal transmission tool.

The principle is: LED lights with a very fast frequency switch, the light flashes when the pulse, signal transmission. This high frequency flicker is imperceptible to the human eye, so the LED lights can be lit, the signal two.

From the late 70s of last century, researchers have studied indoor optical communication. IBM engineers in Zurich built the first working system at the time. In daily life, the use of light to transmit data examples can also be seen everywhere. For example, the early years of the phone's infrared transmission function.

Today, when the energy saving LED becomes the trend of future lighting, scientists naturally choose it as a tool for transmitting signals. And the LED light is visible light, more convenient for people "by the optical cable network".

According to the optical cable network performance mirror reflection can also access the Internet

When the diffuse light makes the whole room bright, the network signal fills the room immediately. Even more amazing is that the light reflected in the mirror is the same signal!

The coverage area of traditional wireless networks depends heavily on the capacity of wireless routers. A wireless router will emit a radio frequency signal when it is in use. Although this wave has not been proven harmful to the human body, but after all, not green. In contrast, the biggest advantage of optical transmission signal is no electromagnetic wave.

On the one hand, the signal strength of optical wireless network is light intensity. At present, the level of research in China, can do diffuse reflection - when the diffuse light to brighten up the whole room, the network signal will immediately flooded the entire room. Even more amazing is that the light reflected in the mirror is the same signal!

LED optical wireless network, network operators and computer equipment without any requirements, as long as it is an ordinary network access. Now on the market to sell the LED lamp only lighting, such as to be used for communication on the LED must be installed on a small "instrument", so that it is high frequency flicker.

In the past, a region to achieve full coverage of wireless signals, can only put a lot of wireless router. Today, scientists can be directly connected to the area where the wires are connected to the communication signal, then whether it is a residential street lights, or every one of the lights, can send the Internet signal.

According to the advantages of faster than the fiber network plane shine optical cable

Optical wireless network just for the last few meters problem, that is, how to broadband data flow from the backbone of the information network terminal to the indoor wireless equipment, its advantages are self-evident.

LED transmission speed faster, more stable signal. The difference of the LED material can lead to the different modulation ability and the maximum bandwidth. At present, it is believed that LED optical wireless network can reach 500Mbps in theory.

There is a communication company "last mile", refers to the broadband service from the high-speed data communication backbone network access terminal users encountered difficulties: Although this is the last short whole communication path, but the high cost is staggering. Now into the area of fiber broadband is 100M. In fact, optical fiber communication is still light, but it is in the special optical fiber transmission, the outside interference is small, so fast. However, different cells need to build different optical networks, usually takes a very long time.

Similarly, the optical wireless network just for the last