Essay:

Essay details:

  • Subject area(s): Science
  • Price: Free download
  • Published on: 15th October 2019
  • File format: Text
  • Number of pages: 2

Text preview of this essay:

This page is a preview - download the full version of this essay above.

LIGHT THROUGH INTERNET

  Chinese researchers from the Institute of Technical Physics in Shanghai have handed remote network information Internet through light rather than the traditional use of radio waves (wireless). Using a LED lamp emitting light of a watt, the team got four computers were connected to the Internet. This small bulb can achieve data streams up to 100 times faster than the speed of access. This new technology is already known as the LIFI.

Do you know any other different wireless network to Wi-Fi? Well, today we talk about the LI-FI or LIFI, a concept that will be talking about the new era of wireless connections, an alternative to known Wi-Fi concept. We will explain what is Li-Fi, how it works, what advantages and disadvantages compared to WiFi and the future that awaits this promising term. Everything simply explain that you understand well.

What IS LI-FI?

Li-Fi refers to the term Light Fidelity in English, or what would be the same in Spanish Fidelity of Light, is communication by visible light, yes, visible light. This light is what makes ultra-fast data transmitted light is received by an optical router.

It is a wireless communication system like the Wi-Fi but using visible light as a means instead of electromagnetic waves. Surely you know that light travels incredibly fast, Can you imagine connect to the Internet and navigate with such speed? But…

HOW DOES LI-FI TECHNOLOGY?

Li-Fi communication means through visible light pulses by which information is transferred, that is, transmitting information via light.

 To get to enjoy this technology we image a light bulb that has a transmitter chip or transmitting mini antenna (similar to wearing traditional routers for wifi) makes it a bright router so that bulb is capable of emitting waves Li-Fi to be captured by the light receptors such as phones, cameras, televisions, computers or other smart appliances. Waves or light pulses emitted by the bulb only issued when the bulb is on and are imperceptible to the human eye.

Logically, it is essential to have an internet connection to the antenna of the bulb forward information to other recipients of a home or office.

The good thing about this technology is that the infrastructure for Lifi technology already exists. There are thousands of lights everywhere, it is estimated that 14 billion.

All we need do is fit a small microchip to every lighting device (LED bulb). Then combine two basic functions: illumination and wireless data transmission.

The founder of this technology and explains how it works:

"When a constant current to a [emitting-diode] LED bulb, a steady stream of photons are emitted from the lamp is observed as visible light is applied. If the current is varied gradually, the output of the light dims up and down (also varies). Because LED bulbs are semiconductor devices, the current, and thus the optical output can be modulated at extremely high speeds that can be detected by a photodetector device and transforming of back into electrical current. the intensity modulation is imperceptible to the human eye, and therefore communication is as transparent as RF [radio frequency technology]. Using this technique, the high-speed information can be transmitted from an LED bulb a receiver ".

 To get to enjoy this technology we image a light bulb that has a transmitter chip or transmitting mini antenna (similar to wearing traditional routers for wifi) makes it a bright router so that bulb is capable of emitting waves Li-Fi to be captured by the light receptors such as phones, cameras, televisions, computers or other smart appliances. Waves or light pulses emitted by the bulb only issued when the bulb is on and are imperceptible to the human eye.

Logically, it is essential to have an internet connection to the antenna of the bulb forward information to other recipients of a home or office.

The good thing about this technology is that the infrastructure for Lifi technology already exists. There are thousands of lights everywhere, it is estimated that 14 billion.

All we need do is fit a small microchip to every lighting device (LED bulb). Then combine two basic functions: illumination and wireless data transmission.

The founder of this technology and explains how it works:

"When a constant current to a [emitting-diode] LED bulb, a steady stream of photons are emitted from the lamp is observed as visible light is applied. If the current is varied gradually, the output of the light dims up and down (also varies). Because LED bulbs are semiconductor devices, the current, and thus the optical output can be modulated at extremely high speeds that can be detected by a photodetector device and transforming of back into electrical current. the intensity modulation is imperceptible to the human eye, and therefore communication is as transparent as RF [radio frequency technology]. Using this technique, the high-speed information can be transmitted from an LED bulb a receiver ".

 ADVANTAGES AND DISADVANTAGES. WI-FI vs LI-FI

Although Lifi technology is still in the experimental phase include promises to be the wireless network in the near future and eventually replace the known Wi-Fi wireless system. Let's see why and what are the advantages and disadvantages of the Li-Fi technology.

ADVANTAGES vs LI-FI WI-FI

- It can provide speeds of 500 mbps (megabits per second), ie, almost 10 times faster than the optical fiber used by Wi-Fi.

- It is cheaper than Wi-Fi, is said to be up to 10 times cheaper.

- Any bulb or lamp can become a hotspot or bright router cheaply and easily, putting a single issuer Li-Fi.

- The light is not through walls, is much safer than Wi-Fi. It can be used in places very concerned about security and banks.

- Does not require radio frequency listed requiring Wi-Fi. Radio frequency communication requires radio circuits, antennas and complex receivers, while Li-Fi is much simpler and uses methods similar to those used in communications devices infrared inexpensive, such as remote controls direct modulation .

- Absence of cables.

- The electric light does not disturb or interfere with communication, it does not cause interference with other systems.

- No saturates the frequency bands used for transmitting information via Wi-Fi.

- It is more energy efficient than Wi-Fi

 DISADVANTAGES LI-FI vs WI-FI

- It does not work under direct sunlight.

- No through partitions or walls.

- It does not work with the light off which can lead to an increase in your rate of light.

- Only it works with those devices (tablets, phones, etc.) having a receiver for such technology, ie, that have a receiver capable of decoding the signal light.

...(download the rest of the essay above)

About this essay:

This essay was submitted to us by a student in order to help you with your studies.

If you use part of this page in your own work, you need to provide a citation, as follows:

Essay Sauce, . Available from:< https://www.essaysauce.com/essays/science/2016-5-2-1462208486.php > [Accessed 11.12.19].