Wifi a technology which has been in our household, offices, malls and many places we visit in our day to day life has found a big brother to its help it’s know as Li-Fi. Li-Fi is a two-way wireless communication technology, high speed and completely network-like Wi-Fi. The term was invented by Harald Haas, and is a form of optical wireless communications (OWC) and uses visible spectrum, as well as ultraviolet and infrared radiation, it’s currently being developed by many organizations around the world.
Li-Fi is a visible light communication (VLC) system. This means that it receives a photodetector (photodiode) for receiving light signals and a signal processing element for converting the data into viewable content. An LED bulb is a semiconductor light source, which means that the constant current of electricity supplied to an LED bulb can be dipped and dimmed, from top to bottom at extremely high speeds, without being visible to naked eye.
For example, the data is inserted into an LED bulb (with the signal processing technology), then sends data (integrated into its beam) at high speed to the photodetector.
Small changes in the rapid attenuation of LED bulbs are converted by the “receiver” into an electrical signal.The signal is converted back into a sequence of binary data that we would recognize as web, video, and audio applications that run on the Internet available devices.
Li-Fi has the advantage of being useful in electromagnetic sensitive areas such as aircraft cabins, hospitals and nuclear power plants without causing electromagnetic interference. Both Wi-Fi as Li-Fi transmitted data across the electromagnetic spectrum, but while Wi-Fi uses radio waves, the Li-Fi uses visible light, ultraviolet light and infrared. The Federal Communications Commission has warned us that Wi-Fi connection is close to its maximum capacity, Li-Fi almost has no capacity limitations. The spectrum of visible light is 10,000 times larger than the entire radio frequency spectrum.The researchers obtained data rates of more than 224 Gbit /s, which is much faster than broadband as of 2013. It is expected that Li-Fi is 10 times cheaper than Wi-Fi.
Short range, low reliability and high installation costs are possible drawbacks, but it has the advantages which convinces us that this is going to be a future technology which will be used in many places for its edge and will be a technology for the coming years.