One second downloading a movie with LED lights LiFi is promising.

In addition to lighting, the LED lamp can also realize communication, that is to set up a reverse information transmission channel to upload information. Similarly, as long as the LED lamp for lighting is equipped with an optical / electrical converter at the same time, it receives the optical signals emitted from the computer (with built-in LED lamps). In this way, LED lights also play the role of wireless router while lighting, and play a dual role in lighting and communication.

Use LiFi to download the Internet and download a movie in 1 second.

Visible light communication was put forward by a Chinese University of Hong Kong scholar in 1999. In recent years, the research in Britain, Germany, the United States and China has made breakthroughs.

In 2011, the United Kingdom refreshed the communication rate of LiFi to 10G. At such a rate, it would take less than one second to download a 1G capacity movie, and the speed would be faster than people imagined. In September 2013, Fudan University tested a prototype of LiFi. After a 1 watt LED lamp was connected to the network signal, the 4 computers could connect to the Internet at the same time. The communication rate reached 3.75G, and the average rate of Internet access reached 150M, and the network speed reached a new height. In January 2014, a French company demonstrated a LiFi smart phone, which was equipped with a light sensor equipped with a front camera and received LED lights with signals. The average rate of Internet access was 10M. It is expected that industrialization will be achieved in one to two years. In October 2014, the United States developed an ultra fast LED lamp, which has increased the luminous speed by 1000 times and improved the communication speed of LiFi to a greater extent.

According to media reports, in January 7th, Fudan University signed an agreement on enterprise entry, and its LiFi project will start the process of industrialization. In addition, according to foreign media reports, the British pure Lifi venture company recently announced that it received a new investment of 15 million pounds to support its development of LiFi network product Li-Flame system. It can turn the ready made LED light into LiFi access point and complete the two-way transmission of data function. Net.

What are the advantages of LiFi?

LiFi has been put forward from the beginning to industrialization, but it is only ten years. The main reason is that compared with radio communication and other optical communications, it has many outstanding advantages.

Spectrum resources are abundant. The overload phenomenon of electromagnetic spectrum communication is very serious, and the spectrum range and bandwidth of visible light far exceed the radio spectrum, and the spectrum resources are very rich. Therefore, the use of LiFi will greatly reduce the pressure of the existing radio spectrum.

The transmission rate is super fast. Many people must have this experience: home access broadband Internet access to 8~12M, but the Internet speed is not fast, watching videos or downloading large files will often card, if the wireless router forwarding once, using Wi Fi signal to access the Internet, the card will be more. The bandwidth of visible light is very wide, which means higher transmission rate. Moreover, the lab products that have been launched show that LiFi can easily achieve the transmission rate above 100M. In the future, it is likely to reach more than 1G in practical applications. Do you still worry about cards?

Communication is harmless and safe. Many people who have Wi Fi in their homes will have this habit: always remember to turn off the wireless network every night before they go to bed, and worry about the harmful effects of wireless signals. The LiFi signal is located in the visible frequency range, emitting ordinary lights, harmless to the human body and low power consumption, so it can be called "green communication". In addition, visible light can not penetrate objects, indoor LiFi, pull the curtains, LiFi signals can not be out of the window, and can not "through the wall", no longer need to worry about someone else to crack your home Wi Fi password, "sharing" your home wireless network.

Convenient, energy saving and high efficiency. LiFi is mainly implemented through LED lights. It uses ready made power lines and does not need to lay any special signal lines. The installation is fast and can be placed anywhere in the room. When the lights are turned on, the signals can be transmitted. The power consumption is less than 5% of the luminous power, and the cost is less than half of the optical fiber broadband, and it can also be used in the human eye. The scope of the adjustment of lighting power can be said to meet the best communication needs, and convenient and efficient.

LiFi military has great potential

Although LiFi is still in development, and has not yet formed commercial products and industrialization, its outstanding advantages can play a large role in the field of military applications.

Underwater communication detection

The underwater propagation of electromagnetic waves is very close, so it is difficult to complete underwater communication and detection. In the early 60s of last century, it was found that the influence of seawater on the propagation of blue-green light was much smaller. It could be used as a window for underwater communication to solve the problem of electromagnetic wave underwater communication and detection. The emergence of LiFi has made a new choice for underwater transmission of electromagnetic waves. Using blue and green LED lights to construct underwater communication or detection system, it is possible to accelerate the realization of the longstanding longing for underwater electromagnetic wave communication and detection, so as to provide high speed for submarines rapid communication, underwater special operations communication and underwater target detection. Effective communication means.

Communication in special places

In the field of field hospitals, operation room, fighter planes and naval vessels, radio equipment is generally not allowed to prevent interference from radio frequency signals. Weapons and ammunition depots, missile silos and special places with high security requirements are also prohibited from carrying radio equipment. As a result, communication on these occasions is limited and can not meet the mission requirements. With LiFi, it is natural to evade the above problems by simply accessing LED lights in special sites into satellite or other communication networks. When meeting the requirements of information confidentiality, we can better implement the exchange of information with the outside world and improve the efficiency of tasks.

Military material storage

There are thousands of military equipment and materials in every equipment and material support base of the military theater. It is not easy to find and understand its reserves at the fastest speed. Using LiFi can solve this problem very well. As long as an indoor LED lamp is used to establish a material storage system, LED lights emit LiFi signals at the same time of lighting, including material name, acquisition time, quantity of storage, performance parameters and location, and so on. The handler can receive the signal quickly and accurately through hand-held mobile devices. To achieve efficient management of inventory materials.

Monitoring and control of takeoff and landing

On the land Military airports or aircraft carrier deck, the LED lighting is used to build the lighting indicating facilities for the aircraft to take off and landing. The communication link of the take-off and landing command system is established by using LiFi to meet the night lighting and indicating requirements of the fighters, and the information and take-off and landing command signals are automatically transmitted to monitor the start and cause of the fighters. Barrier status and real-time location provide reliable security for efficient fighter operation.

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