100x times fastest Internet_Li-Fi
What is Wi-Fi?
Since Wi Fi is an accidental invention in 1992 by Australian astronomer Dr.John O’Sullivan. Through a failed experiment to detect exploding mini black holes, He discovered Wi-Fi. Wi fi has revolutionized digital communication. Without it, our current mobile way of life would be somewhat different. Wifi currently makes up 60% of global internet traffic. With all of that being, Wifi still has some issues. It’s sketchy at times with a varying signal and it’s not totally secure. This is because your signal can travel through walls and be easily picked up by someone else. The reason for all of this is that Wi Fi uses radio waves to transmit data. So how do we improve this technology?
We must use something cheap, safe, plentiful and more robust for data transfer. The answer: Light. Light is perfect because it’s actually just part of the electromagnetic spectrum, just like radio waves, But at a much higher frequency i.e; The waves that carry the energy cycle at a much faster rate than radio waves. Light also has a frequency range 10,000 times greater than radio waves. Going up to 790 terahertz versus a maximum of 300 gigahertz of radio waves. All this means is, light has the capacity to transmit vastly more pulses of data in much less time than radio waves. The concept of light being used as a medium to transfer internet data has been coined wi-fi. The words from Harold Hass, The founder of Li-Fi.
“The light bulbs at the ceiling, we can use them for communication. And there’s one thing we need to do is, we have to replace these inefficient, incandescent light bulbs fluorescent lights with this new technology of LED light bulbs. An LED is a semiconductor. It’s an electronic device. it has very nice quality or property. Its intensity can be modulated at very very high speeds and you can switch it off at very high speed. This is the fundamental basic property that we exploit with our technology. So how this all works? You all know the remote controls have an infrared LED, basically switch on the LED and you can switch it off, and it creates a simple low-speed data stream in 10,000 bits/second, 20,000 bits/second, not usable for the youtube video. What we have done is that we have developed a new technology with which we transmit out technology, not only a single data stream. We transmit thousands of data streams in parallel at even higher speeds.”
He does a pretty cool demonstration. He fits a desk lamps with a normal LED bulb, worth about $3. A software code makes the bogue flicker at extremely high speeds. This flickering or pulsing is then converted into a signal by a receiver.
Harald hopes to integrate this receiver technology into phones and even phone camera. So that they can send and receive high bitrate information through and from light. you might be wondering what you have to turn on light to receive the data. The answer is Yes. But the thing is you can actually dim the light down, so the human eye cannot detect that it’s on. But the receiver still can read it.
Li-Fi is 100x faster than the average Wi-Fi speed. Researchers of the Oxford University have published results of visible light internet at 223 gigabits per second. With this speed, you can download 18 movies of size 1.5 GB in one second. If Li-Fi becomes widely available, it would have turned a corner into a technological revolution that would lead to a world where the internet and transfer of information is no longer an obstacle for the average user.