LiFi Technology – “Turning your Light Bulbs into Data Broadcaster”
What is LiFi?
LiFi is the use of the visible light portion of the electromagnetic spectrum to transmit information at very high speeds. This is in contrast to established forms of wireless communication such as Wi-Fi which use traditional radio frequency (RF) signals to transmit data.
Li-Fi is a VLC, visible light communication, the Technology developed by a team of scientists including Dr. Gordon Povey, Prof. Herald Haas and Dr. Mostafa Afgani at the University of Edinburgh. The term Li-Fi was coined by Prof. Haas in July 2011.
Here are some pin points about Li-Fi. Have a look..
- Li-Fi is now part of the Visible Light Communications (VLC) PAN IEEE 802.15.7 standard.
- Li-Fi is typically implemented using white LED light bulbs.
- Li-Fi can be thought of as a light-based Wi-Fi that is, it uses light instead of radio waves to transmit information.
Instead of Wi-Fi modems, Li-Fi would use transceiver-fitted LED lamps that can light a room as well as transmit and receive information.
- This technology uses a part of the electromagnetic spectrum that is still not greatly utilized- The Visible Spectrum.
- It is possible to encode data in the light by varying the rate at which the LEDs flicker on and off to give different strings of 1s and 0s. The LED intensity is modulated so rapidly that human eyes cannot notice, so the output appears constant.
- It is capable of transmitting data at 100 MB/s – faster than most UK broadband connections.
How LiFi Works?
Prof Harald Haas, explained the mechanism in his TED Global talk on VLC. He stated..
” Very simple, if the LED is on, you transmit a digital 1, if it’s off you transmit a 0. The LEDs can be switched on and off very quickly, which gives nice opportunities for transmitting data.”
I showed a block diagram of LiFi’s functioning. Take a look..
So what you require at all are some LEDs and a controller that code data into those LEDs. We have to just vary the rate at which the LED’s flicker depending upon the data we want to encode.
Further enhancements can be made in this method, like using an array of LEDs for parallel data transmission, or using mixtures of red, green and blue LEDs to alter the light’s frequency with each frequency encoding a different data channel. Such advancements promise a theoretical speed of 10 Gbps –meaning you can download a full high-definition film in just 30 seconds.
- Since Li-Fi uses just the light, it can be used safely in aircraft and hospitals that are prone to interference from radio waves.
- This can even work underwater where Wi-Fi fails completely, thereby throwing open endless opportunities for military operations.
- Light is inherently safe and can be used in places where radio frequency communication is often deemed problematic, such as in aircraft cabins or hospitals.
- The visible light spectrum is unused, it is not regulated, and can be used for communication at very high speeds.
That’s all from this post guys. Stay tuned for more tech Updates.
Till next, Keep Sharing & Tweaking! 🙂