According to the Daily Science website, Jelena Vucic, a researcher at the Hanleigh-Hez Institute in Germany, said that if you use broadband Internet access in the future, it will become as easy as switching lights on and off, and your home’s light bulb will one day become a wireless transmitter. Signal media. The advantage of this application is that it can effectively use indoor lighting to make lighting and information work synergistically.
At present, most of the wireless communication between home and business are connected via RF WiFi. However, due to the limited bandwidth of WiFi, more available channels may not be found in the already saturated radio spectrum. However, the wireless communication bandwidth in the visible spectrum can also be utilized.
Indoors, you can use the flashing lights to generate signals. Flashing frequency is faster than human vision, so people will not be affected. On the other hand, because the visible light signal cannot penetrate the wall, there is no interference from spurious signals, and there is no need to worry about foreign hackers.
Incandescent and fluorescent lamps cannot provide fast enough flashing frequency, so LED bulbs must be used to transmit data. Although commercially available LED lamps only have a limited bandwidth of a few megahertz, the research team stated that the blue spectrum can be preserved by LED filtering technology and can be increased to 10 times the bandwidth.
Through the laboratory's visible light radio network, they can download data at a rate of 100 million bits per second, but after updating the receiver, the download speed can be increased to 230 million bits per second, which is a commercial LED application. The fastest record of visible light wireless communications.
Lena VuÄić said that although advanced radio signals can achieve fairly fast transmission speeds, they should be able to use more sophisticated modulation methods to double the transmission speed.
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