15-06-2013, 02:58 PM
Li-Fi
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What is Li-Fi?
Li-Fi is a term often used to describe Visible Light Communications technology applied to high speed wireless communications.
It acquired this name due to the similarity to Wi-Fi, only using light instead of radio.
Wi-Fi is great for general wireless coverage within buildings, and Li-Fi is ideal for high density wireless data coverage in confined areas and for relieving radio interference issues, so the two technologies can be considered complimentary.
Li-Fi is typically implemented using white LED light bulbs at the downlink transmitter. These devices are normally used for illumination only by applying a constant current. However, by fast and subtle variations of the current, the optical output can be made to vary at extremely high speeds. Unseen by the human eye, this variation is used to carry high speed data.
Why you need to get a Li-Fi!
Radio spectrum is congested but the demand for wireless data doubles each year. Everything, it seems, wants to use wireless data but the capacity is drying up. Wireless radio frequencies are getting higher, complexities are growing and RF interference continues to grow. So what can carry this excess demand in the future?
The solution is Li-Fi. Direct modulation of LED devices is a low cost, secure, and safe way to transmit data, and there is an abundance of free visible light spectrum. High intensity LEDs used in light bulbs, flash lights and cameras can transmit very high data rates, faster than Wi-Fi!