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Thursday, January 27, 2022

Li Fi Technology, An Amazing Innovation Indeed

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Talking about Li Fi technology and using of the internet, there are currently 4.3 billion people using the internet. According to the Central Intelligence Agency (CIA) Factbook, there were around 62.9 million internet users in the United Kingdom alone.

According to a survey published by Global Market Insights, the Li-Fi market would be worth £59.2 billion by 2023. Because of technical improvements and rising demand for high-speed data and communication network, the Li-Fi market is expected to grow rapidly throughout the projected period.

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Li Fi Technology

The Li-Fi sector is being boosted by energy-efficient LEDs and the availability of a secure wireless network. The increased use of the internet via smartphones and other electronic devices is fueling the expansion of the Li-Fi market. Other factors driving the growth of the Li-Fi market include increased demand for innovations technology and technical improvements.

What Is LiFi

LiFi is a wireless optical networking system that transmits data using light-emitting diodes (LEDs).

LiFi is made to work with LED light bulbs, which are comparable to those found in many energy-conscious homes and offices. LiFi bulbs, on the other hand, are equipped with a chip that modulates light invisibly for optical data communication. The LED lamps send LiFi data, which photoreceptors receive.

The first LiFi prototypes were capable of 150 megabits per second (Mbps). There have been some commercial kits made that enable that speed. Researchers have enabled 10 gigabits per second (Gbps) in the lab, which is faster than 802.11ad, using stronger LEDs and other technologies.

How does Li-Fi work?

Li-Fi is light-based data communication that is high-speed, bidirectional, and completely networked. A Li-Fi network is made up of multiple light bulbs that work together to generate wireless network adapters.

A stream of light (photons) is emitted from an LED light bulb when an electrical current is passed through it. Because LED bulbs are semiconductor devices, the brightness of the light passing through them can vary at incredibly fast rates. The signal is conveyed by changing the rate of light modulation. A detector receives the signal and interprets the changes in light intensity (the signal) into data. You also broadcast a digital 1 when the LED is turned on, and a 0 when it is turned off.




Technology IrDA compliant devices WLAN 802.11a/b/g/n/ac/ad standard
Operating Frequency 10,000 times frequency spectrum of radio 2.4 GHz, 4.9 GHz, and 5 GHz
Coverage Around 10 meters Around 32 meters and varies on power /antennae type
Data Density Works in a high dense environment Works in a less dense environment
Privacy Light is blocked by walls, hence more secured. RF signal cant be blocked by walls, hence less secured
Data Transfer Speed Faster transfer speed (>1 Gbps) Slower transfer speed (150 Mbps)
Medium of Data Transfer Light as the carrier Radio spectrum is a carrier
Spectrum Range Light has spectrum 10000 times broader than radio frequency Radiofrequency spectrum is much less than light spectrum
Cost Cheaper than Wifi due to –

1 – No license required for light band

2 – Lower installation cost

Cheaper than Wifi due to –

1 – License required for radio band

2 – Higher installation cost

Ecological impact Low Medium
Market Maturity Low High
System components Lamp driver, LED bulb (lamp), and photodetector will make up a complete LiFi system. requires routers to be installed, subscriber devices(laptops, PDAs, desktops) are referred to as stations
Applications Used in airlines, undersea explorations, operation theaters in the hospitals, office and home premises for data transfer and internet browsing Used for internet browsing with the help of wifi kiosks or wifi hotspots
Merits(advantages)  Interference is less, can pass through salty seawater, works in densely region Interference is more, can not pass through seawater, works in less densely region


The following are some of the benefits of LiFi technology.

Li Fi Technology

1 The principle of LiFi (Light Fidelity) is based on VLC (Visible Light Communication).

1 A LED lamp and a Li-Fi dongle are the two fundamental components that drive the internet.

  • Light intensity modulation (LiFi) is used to convey data.
  • At the transmit end, LEDs are used, and at the receive end, photo-detectors are used.
  • The LiFi technology has three different modes: peer to peer, star, and broadcast.
  • OOK, VPPM, and CSK modulation techniques are used in LiFi systems.
  • The IEEE 802.15.7-2011 standard defines the PHY and MAC layers of a LiFi system.
  • LiFi technology is utilized in a variety of applications, including as street lights, billboards, and the internet.
  • The LOS (Line of Sight) operation of optical communications allows it to convey data quickly and securely.

The following are some of the benefits of WiFi technology.

  • It comprises two key components: a Wi-Fi router modem or access point (AP), as well as a Wi-Fi dongle and Wi-Fi stations.
  • A WiFi access point vs extender or router is connected to the internet via a broadband cable or cellular network, as depicted. To access the internet, all wifi-enabled mobile phones, tablets, and laptops are connected to an AP (or router).
  • A WiFi network can operate in one of two modes: adhoc (i.e. BSS-Basic Service Set) or infrastructure (i.e. BSS-Basic Service Set) (i.e. ESS-Extended Service Set).
  • Stations that are BSS WLAN compatible (i.e. STAs) communicate directly. To access the internet, ESS WLAN compatible STAs communicate with APs (Access Points).
  • Different speeds and coverage ranges are supported via WiFi, depending on the devices’ implemented standards (STAs, APs). 802.11ac wave-1 supports up to 1.3 Gbps (80MHz, 3 streams, 256QAM), 802.11ac wave-2 supports up to 3.5 Gbps (160MHz, 4 streams, 256QAM), and so on. It is possible to cross a distance of 70 meters (inside) to 250 meters (outside).
  • The WiFi network uses two frequency bands: 2.4 GHz and 5 GHz.

The IEEE 802.11 standards define the PHY and MAC layers of WiFi systems. 802.11 comes in a variety of flavors, including 11a, 11b, 11g, 11n, and 11ac.

Li Fi Technology

The two main components of a Li-Fi network are

LED Light Source

In Li-Fi, light sources, such as light fixtures already in use for illumination as well as unique light sources built specifically for the purpose, are utilized to transmit data. Because of their dependability and efficiency, LED lights mirror are ideal for data transmission network.

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Both uplink and downlink are possible thanks to infrared detectors that detect signals from devices. Power over Ethernet  devices(POE) or Power-Line Communication can be used to power and supply data to the light fixtures, which operate as data access points (PLC).

The light source sends out pulses of light to transfer data, which a receiver may collect and decipher. So, wouldn’t having flashing lamps all around the place be creepy? Not at all. The problem is that the pulses would be emitted at a rate of over a million times per second, which is far too fast for our eyes to detect.

It’s also not necessary for the lighting to be overly bright. They can even be dimmed to the point of falling below the visible spectrum while still serving their purpose. So just because you turn out the light in your bedroom to go to sleep doesn’t mean you have to disconnect from the internet as well.

Li-Fi Enabled Devices

A receiver, which is a photodiode, is used to detect the signal contained inside the light generated by the transmitter in a Li-Fi enabled device. The modulated pulses are captured by the detector and converted into data in the same way as morse code is translated.

The gadgets are also equipped with infrared transmitters for sending data back up to the light source, allowing data to flow in both directions.

Li Fi Technology

Advantages Of Lifi Technology

The following are some of the advantages or benefits of LiFi technology:

1 It has a higher data transfer rate for internet applications, and it gives a high level of security because data communication is done in line of sight (LOS). 

2 Furthermore, the lifi signal only covers a small area and does not travel through walls. Unauthorized persons will not be able to access the wifi signal as a result of this.

3 As a result of its low power consumption, lifi devices are commonly employed in IoT applications.

4 It operates in the optical spectrum, avoiding the already congested RF spectrum.

5 It works on optical bands, which are less hazardous than the RF spectrum. As a result, the LiFi-based technology poses no health risks.

6 The lighting business, which employs LiFi-based equipment, saves a significant amount of energy.

7 It is simple to set up.

Li Fi Technology

Disadvantages Of LiFi Technology

 1 Only where the source device’s light is available can the Internet be used.

Furthermore, light cannot pass through barriers and can only act in a line of sight path. This restricts internet access option to where it is needed. It also has a limited range.

3 It is not suitable for usage in an outside area, as is the case with RF signals. This is due to interference from adjacent light sources and other optical sources. Furthermore, if used outside, it can be intercepted by undesirable parties.

4 Despite its ease of installation, the Lifi system necessitates a completely new infrastructure. This will increase the cost of LiFi Internet access for businesses and individuals.

5 Despite the fact that it consumes little energy, lights must be turned on at all times of the day and night in order to use lifi internet services. Because the internet is so important these days, this system will squander more energy than any other internet system.

 Before sleeping in the bed, one cannot view games and movies on the internet in the dark.

Thank you for reading!!

We will be sharing to you the applications of Li-Fi in our next post,do well to connect with us.

For now you can comment and share this post with your friends ,

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