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Li-Fi(光保真)-无线通信的新范式

摘要

当你读到标题时，你脑海中出现的第一个词是Wi-Fi(无线保真度)，我们大多数人都很熟悉，它使用2.4-5 GHz RF(射频)在大范围内提供互联网接入。当你通过无线网络使用互联网时，你可能会被剥夺网络的速度。随着越来越多的用户连接到网络，数据传输速率降低。因此，当人们使用多种设备接入无线互联网时，阻塞的电波将使他们越来越难以获得可靠的信号。无线网络使用无线电波来传输数据。但无线电波只是可以携带我们数据的频谱的一部分。我们已经变得非常依赖这种几乎无处不在的服务。但和大多数技术一样，它也有局限性。所以一个问题出现在我们的脑海中，我们不能使用光谱的另一部分吗?答案是肯定的。 The part of spectrum that we can use conveniently is the visible spectrum. German physicist, Dr. Harald Haas, has put forward the idea of “Data Through Illumination”—taking the fiber out of fiber optics by sending data through an LED light bulb that varies in intensity faster than the human eye can follow. It’s the same idea behind infrared remote controls, but far more powerful. Haas says his invention, which he calls D-Light, can produce data rates faster than 10 megabits per second, which is speedier than your average broadband connection. He envisions a future where data for laptops, smart phones, and tablets is transmitted through the light in a room. And security would be snap – if you can’t see the light, you can’t access the data. Optical wireless technologies, sometimes called visible light communication (VLC), and more recently referred to as Li-Fi (Light Fidelity), on the other hand, offer an entirely new paradigm in wireless technologies in terms of communication speed, flexibility and usability. In simple words Li-Fi is a method of communication in which we transmit data using visible light region of electromagnetic spectrum with the help of LEDs. So by Li-Fi you attain data transmission by using your simple light resources. So you can now connect to internet where ever you find light, in schools, colleges, offices, aircrafts and even on the roads and almost everywhere because there are rare places where light is not present.

Dr.Simmi Dutta, Kameshwar Sharma, Naman Gupta, Tenzen Lovedon Bodh

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