Now a days every one is suffering with slow internet connectivity, so by using light bulb we can connect high speed internet with Li-Fi.
What is Li-Fi?
Light Fidelity or Li-Fi is a bidirectional, high-speed and fully networked wireless communication technology similar to Wi-Fi, it is a Visible Light Communications (VLC) system.Li-Fi uses common household LED (light emitting diodes) light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.The term Li-Fi was coined by University of Edinburgh Professor Harald Haas during a TED Talk in 2011. Haas envisioned light bulbs that could act as wireless routers.
How it works
Li-Fi and Wi-Fi are quite similar as both transmit data electromagnetically. However, Wi-Fi uses radio waves while Li-Fi runs on visible light, which has much wider bandwidth.As we now know, Li-Fi is a Visible Light Communications (VLC) system. This means that it accommodates a photo-detector to receive light signals and a signal processing element to convert the data into ‘stream-able’ content.An LED light bulb is a semi-conductor light source meaning that the constant current of electricity supplied to an LED light bulb can be dipped and dimmed, up and down at extremely high speeds, without being visible to the human eye.
For example, data is fed into an LED light bulb (with signal processing technology), it then sends data (embedded in its beam) at rapid speeds to the photo-detector (photo diode).
The tiny changes in the rapid dimming of LED bulbs is then converted by the ‘receiver’ into electrical signal.
The signal is then converted back into a binary data stream that we would recognise as web, video and audio applications that run on internet enables devices.
Li-Fi vs Wi-Fi
While some may think that Li-Fi with its 224 gigabits per second leaves Wi-Fi in the dust, Li-Fi’s exclusive use of visible light could halt a mass uptake.
Li-Fi signals cannot pass through walls, so in order to enjoy full connectivity, capable LED bulbs will need to be placed throughout the home. Not to mention, it requires the light bulb is on at all times to provide connectivity, meaning that the lights will need to be on during the day.
What’s more, where there is a lack of light bulbs, there is a lack of internet so Li-Fi does take a hit when it comes to public Wi-Fi networks.
In an announcement yesterday, an extension of standard Wi-Fi is coming and it’s called Wi-Fi HaLow.
This new project claims to double the range of connectivity while using less power. Due to this, Wi-Fi HaLow is reportedly perfect for battery powered devices such as smartwatches, smartphones and lends itself to Internet of Things devices such as sensors and smart applications.
But it’s not all doom and gloom! Due to its impressive speeds, it could make a huge impact on the internet of things too, with data transferred at much higher levels with even more devices able to connect to one another.
What’s more, due to its shorter range, it is more secure than Wi-Fi and it’s reported that embedded light beams reflected off a surface could still achieve 70 megabits per second.