Black Technology: No WiFi? You can also access the Internet with a LED light.

Black Technology: No WiFi? Come to the internet with a led light

Invoking Wikipedia's information:

Visible Light Communications (VLC) is a wireless communication technology that uses light and dark flashing signals from objects such as fluorescent lamps or light-emitting diodes ( LEDs ) to transmit information. The frequency of visible light is between 400THz (wavelength 780nm) to 800THz (wavelength 375nm).

When using ordinary fluorescent lamps, its transmission capacity is 10kbit/s. When using LED lights, you can reach 500Mbit/s. The transmission distance can reach 1-2 kilometers. Its biggest feature is the ability to combine solid state lighting technology.

Visible light communication can be applied to the fields of light Internet access, visible light on demand television service, new visible light radio broadcast, and precise visible light positioning.

In short, without a WiFi signal, you can tap the LED light to get online.

Black Technology: No WiFi? Go online with a LED light

In addition, compared with WiFi Internet access, visible light communication technology is green and low-carbon, and can effectively avoid the weakness of radio communication electromagnetic signal leakage, and quickly construct a safety information space for anti-interference and anti-interception.

According to Yan Jiangxing, an academician of the Chinese Academy of Engineering, there are currently about 44 billion lamps and lanterns in the world, and the integration of tens of billions of led lighting devices with other devices will create a huge visible light communication network.

Imagine this scenario:

In the future, every lamp can be used as a high-speed network hotspot. People can download movies under the street lights and high-speed Internet access on the high-speed rail...

Black Technology: No WiFi? Go online with a LED light

In fact, "visible light communication" is not a new topic. As early as two years ago, Fudan University had already used this technology to achieve lighting online. The media reported at the time:

The researchers connected the network signal to a 1W LED bead. The four computers under the light can access the Internet, with a maximum speed of 3.25G and an average Internet speed of 150M, making it the world's fastest "lighting Internet."

Now, this technology has made new breakthroughs. Qi Jiangxing believes that visible light communication can effectively break through the dilemma of lack of radio spectrum resources:

(It) is one of the next generation wireless communication technologies with broad application prospects, and can form a strategic emerging industry with a trillion-year output value.

Of course, nothing will go smoothly. "Because, from lighting communication control to chip design and manufacturing, a series of key technology products are all researchers' hands-on, to truly enter the thousands of households like WiFi, through a series of industrial development, there is still very Long way to go." Chi Nan believes that Lifi technology itself has its limitations, for example, if the lights are blocked, the network signal will be cut off and so on. Therefore, it is not a competitor to WiFi, but a complement to each other that helps to free up spectrum space.