Li-Fi Technology Newest Generation of Wi-Fi

Public Topics - Li-Fi Technology Newest Generation of Wi-Fi. The technology is growing very rapidly, it makes us as users helped. Of the many technologies that might be some of them that have made us satisfied. But did you know that out there experts in the field they continuously innovate and develop technologies that already exist. One of the technologies that today have innovated is Wi-Fi.

Wi-Fi which we know as the wireless technology for an Internet network, may soon be changing. Results of experiments conducted by Oxford University and University College recently getting the system called Li-Fi, a technology in which light is used as a medium of instruction data that can transfer data at speeds up to 100 Gbps. Reaching speeds many times faster than Wi-Fi is presumably would be the latest in wireless networking technology that will replace Wi-Fi. So how did the Li-Fi technology itself is actually? Here's his review.

Light Fidelity (Li-Fi) is a two-way, with high-speed wireless communication technology and has completely the same network similar to Wi-Fi. Li-Fi is an acronym for Light Fidelity is a wireless network for communications systems that use light as a medium. The term was coined by Harald Haas, Professor of Mobile Communications at the University of Edinburgh. Li-Fi is a form of communication and a part of the visible light optical wireless communication (OWC) and can be complementary RF communications (Wi-Fi or cellular networks), or even a substitute in the context of the data broadcasting.

In this case, wire and communications uv visible light or infrared and near-ultraviolet instead of the radio frequency spectrum, part of optical wireless communication technology, which brings more information and has been proposed as a solution to the limitations of RF bandwidth. And the technology is no longer using conventional radio frequencies on Wi-Fi. Technology that can transfer data up to 100 Gbps have been successfully demonstrated in a pair Smartphone Casio at the Consumer Electronics Show 2012 in Las Vegas.

History

Harald Haas, is the person who coined the term "Li-Fi" at his home. Global TED Talk in which he introduced the idea of ​​a "Wireless data from any lights. He was chairman of Mobile Communications at the University of Edinburgh and co-founder of pureLiFi.

General term visible light communication (VLC), whose history dates back to the 1880s, including the use of visible light portion of the electromagnetic spectrum to transmit information. Project D-Light in Edinburgh Institute for Digital Communications funded from January 2010 until the month of January 2012. Haas promoted this technology in his 2011, global TED talk and help start a company to market it. PureLiFi, previously pureVLC, is the original equipment manufacturer (OEM) company founded to commercialize products Li-Fi for seamless integration with existing LED lighting systems.

In October 2011, the company and the industry group formed Consortium of Li-Fi, to promote high-speed optical wireless systems and to address the limited number of radio-based wireless spectrum available by utilizing a completely different part of the electromagnetic spectrum.

A number of companies offer products VLC uni-directional, that is not the same as Li-Fi - a term defined by the IEEE standardization committee 802.15.7r1.

VLC technology exhibited in 2012 using a Li-Fi. In August of 2013, the data rates of more than 1.6 Gbit / s indicated more than one color LED. In September 2013, a press release said that Li-Fi, or VLC system in general, does not require line-of-sight. In October 2013, reported a Chinese manufacturer who is working on the development of Li-Fi kit.

In April 2014, Russian company Stins Coman announced the development of wireless local networks called Li-Fi Beam Caster. during data transfer their modules in 1.25 gigabytes per second, but they predict increasing the speed up to 5 GB / sec in the near future. In 2014 a new record was set by Sisoft (a Mexican company) that is capable of transferring data at speeds up to 10 Gb / s in the spectrum of light emitted by LED lights.

CMOS optical receiver has recently integrated Li-Fi system implemented with avalanche photodiodes (APD), which has a low sensitivity. In July 2015, the IEEE has operated APD in Geiger-mode as single photon avalanche diode (SPAD) to improve the efficiency of energy usage and make the receiver more sensitive. Also this operation can be performed as a quantum limited sensitivity that makes the receiver to detect weak signals from a distance.

How make it work Li-fi?

Li-Fi to make it work, you need two light sources which are at each end of the device. The light source can be used is an LED or a photo detector (Light Sensor). When the LED light is on, the light sensor at the other end of the device will detect it and interpret it as a binary one.

Then what kind of data can be transmitted with a Li-Fi technology this? In particular the number of LED light earlier, a message will be sent and then captured by the detector light on other devices.

Furthermore, Li-Fi technology will use some color on the LED light. If these colors light up together then this will create a huge building information to be sent at once.

Currently it is only with the use of green laser and red laser with the same data can be sent at a speed of 1 Gbps. What if the technology is to use a lot of colors? Of course, the speed will reach many times.

Li-Fi Why so fast?

Li-Fi that has a data rate many times higher than the Wi-Fi is caused by the type of LED is a semiconductor has different properties than other types of lamps. With properties and characteristics such as these make the LED is able to switch on and off within a few nanoseconds, or billionths of a second.

This nanoseconds if converted into a data rate equivalent to 1 Gbits / s. Therefore when Wi-Fi is only up to 100 Mbits / s data rate, then this means that Li-Fi has a speed 10 times faster than Wi-Fi.

The advantages of Li-Fi

The advantage of using Li-Fi is easier for anyone to access the Internet anywhere even in remote areas inaccessible even by optical cable. Besides Li-Fi can also be used to control the traffic conditions by placing this new technology into the car LED.

The same function was also to be applied to the aircraft overhead lights. Another advantage of Li-Fi technology is capable of reducing electromagnetic pollution generated by radio waves.

Weakness of Li-Fi

Although it has many advantages of Li-Fi technology also still has some disadvantages compared to conventional Wi-Fi systems. Li-Fi base station that is applied to the ceiling of this room requires a direct line of sight or "views" directly to the destination device. Direct line, it is also to be equipped with a special receiver, such as infra red connection to the old school gadget.

In addition, the device's purpose must not be transported. Of the existing development, Li-Fi technology also saves a lot of challenges, among others membutuhkanline-of-sight is perfect for sending data. The other major challenge is how to send the data back to the transmitter optimally.