Imagine a time when each of the lightbulbs in your house is a source os Internet. Imagine a scenario where, standing under a lightbulb for 1 minute, you would have downloaded around 5 movies in HD. Sounds like a dream, right? But thanks to Li-Fi technology, this dream will soon turn into reality. With this new twchnology, we can reimagine the role light plays in the universe.
What is Li-Fi?
well, Li-Fi stands for Light Fidelity and is a Visible Light Communications (VLC) system and it uses light to send wireless data embedded in its beam. A Li-Fi enables device converts the beam of light into an electrical signal. The signal is then convert back into data. German physicist Harald Haas coined the term during a TED Talk in 2011. he envisioned the idea of using lightbulbs as wireless routers.
Li-Fi bulbs are outfit with a chip that modulates the light imperceptibly for optical data transmission. Households LED bulbs transmit the Li-Fi data and photoreceptors receive it. If implemented menticulously, Li-Fi systems can reach transmission speeds which are upto 100 times faster (more than 1GB per second) than the current traditional Wi-Fi which works on radiowaves.
Architecture Of Li-Fi System:
Li-Fi which can be the future of data communication appears to be a fast and cheap optical version of Wi-Fi. It uses visible light of electromagnetic spectrum between 400 THz and 800 THz as optical carrier for data transmission and illumination.
The main commponents of a basic Li-Fi system sontains the following;
- A high brightness white LED which acts as transmission source.
- A silicon photodiode with good response to visible light as the receiving element.
LED light bulbs can be dipped and dimmed, up and down at extremely high speeds, without being visible to human eyes. The tiny changes/pulses in rapid dimming of LED bulbs is then converted back into a binary data stream. That we would recognise as web, video and audio applications that ruun on internet enabled devices.