Is Li-Fi the fresh Wi-Fi? • Jullia Birsan • Devoxx Poland 2021

Li-Fi stands for light fidelity and it is simply a fresh technology, utilized in wireless communication system, which is suitable for data transmission via light. Li-Fi is fundamentally just high-speed wireless data transmission through light, which is simply a part of the visible spectrum that is inactive not much used.That light can come from something as simple as a LED lamp. prof. Harald Haas, the Chair of Mobile Communications at the University of Edinburgh, is the founder of Li-Fi. He coined the word Li-Fi and he gave a demonstration of a Li-Fi prototype at the TED Global conference in Edinburgh on 12th July 2011.
The Li-Fi can be regarded as light-based Wi-Fi, but alternatively of radio waves it uses light to transmit data. In place of Wi-Fi modems, Li-Fi would usage transceivers fitted with LED lamps that would light a area as well as transmitting and receiving information. The light sends data through truly fast flickering that the human eye can’t detect. At the receiver part, the data is extracted by utilizing a photosensitive component which is able to detect the variations of the light intensity. The receiver can be the smartphone or any another device that has a photosensor.
There are many useful applications which can usage the LiFi, like indoor navigation, especially for blind people; under water communication system, underground or tunnel navigation system, supermarket navigation strategy and discount information based on location, smart indoor localization and many others.

Why choosing Li-Fi alternatively of Wi-Fi?
The spectrum available for Wi-Fi is limited to an area close 5 GHz, while Li-Fi information is transmitted on beams of light, whose scope is an tremendous chunk of the electromagnetic spectrum, clustered around 500,000 GHz. Thus, the scope of frequencies available to transmit Li-Fi data is virtually limitless.
Light waves and radio waves, which are the basis of Wi-Fi and Li-Fi, disagree vastly on what they can pass through and what stops them. For example, solid walls halt light waves, so this can be interpreted as built-in safety for Li-Fi, as restricted information will not be available to outsiders.

Lecture took place on Friday 27th August 2021 at 12:40 in area 2

Jullia Birsan:
I am a improvement engineer at ING Bank Bucharest, Java being the language I speak. I am besides a curious individual that developed a passion for robotics since I was first introduced to it in university.

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