What is Li-Fi Technology – How it Works, Applications, And Future

Learn to explore the fascinating world of Li-Fi technology. Discover how it works, its applications, and its potential for the future.
Wireless technology has become an incredibly useful part of our daily life. We have depended on wireless connectivity even in our homes since the popularity of cell phones. However, the traditional Wi-Fi system has some security issues and a limited range. We're hearing and reading a lot about Li-Fi technology right now. Li-Fi technology is a wireless technology that communicates or exchanges data via visible light. In this article, we will look at the fundamentals of Li-Fi, how it works, its advantages and disadvantages, and its application and future.
Li-Fi technology
Source: pureLiFi and EPT.CA

How Does Li-Fi Technology Work?

Li-Fi technology communicates with visible light by using LED bulbs. LED bulbs contain modules that emit information light signals. The data is encoded into the light signal using a technique known as orthogonal multiplexing of frequencies (OFDM). OFDM is a method of encoding data across multiple carrier frequencies, which helps to provide reliability while maintaining high data rates.

Li-Fi technology can function in a variety of lighting conditions, including complete darkness within the room. However, because Li-Fi technology requires direct contact between the transmitter and receiver, it cannot pass through solid objects such as walls, furniture, or bones.

Advantages of Li-Fi Technology

Li-Fi technology has several advantages over traditional Wi-Fi technology, including the following:
  1. High-Speed Data Transmission: Compared to traditional Wi-Fi technology, Li-Fi technology can transmit data at speeds up to 100 times faster. Data transmission rates of up to 10 Gbps are possible with Li-Fi technology, which is significantly faster than traditional Wi-Fi technology.
  2. Increased Bandwidth: Li-Fi technology transmits data using the visible light spectrum, which provides more bandwidth than traditional Wi-Fi technology.
  3. Secure Communication: Because light signals cannot penetrate walls and can be confined within a specific area, Li-Fi technology provides secure communication, making it more difficult for hackers to intercept data.
  4. No interference: Because Li-Fi technology does not interfere with radio signals, it is an excellent choice for environments prone to radio frequency interference.
  5. Energy-efficient: Li-Fi technology consumes less power compared to traditional Wi-Fi technology, as it uses LED lights for data transmission, which are energy-efficient.

Disadvantages of Li-Fi Technology:

Li-Fi technology also has some drawbacks, including:
  1. Limited Range: Li-Fi technology has a limited range when compared to traditional Wi-Fi technology because light signals cannot penetrate walls and are best used in confined areas such as a room or a building.
  2. Line-of-Sight Communication: Li-Fi technology requires line-of-sight communication, which means that the transmitter and receiver must have a direct line of sight, which can be obstructed by objects such as walls, furniture, and people.
  3. Expensive Infrastructure: Li-Fi technology necessitates the purchase of costly infrastructure, such as LED bulbs and photodetectors.
  4. Light-sensitive: Li-Fi technology is light-sensitive and can be influenced by external light sources such as sunlight and other artificial light sources.
  5. Incompatibility with existing devices: Li-Fi technology is not compatible with existing Wi-Fi devices, and therefore requires the installation of new devices that are compatible with Li-Fi technology.

Potential Applications of Li-Fi Technology

Li-Fi technology also has some drawbacks, including:
  • Automotive: Li-Fi technology can be used in vehicles to provide high-speed and secure communication between the vehicle and its nearby area, such as traffic signals and other vehicles.
  • Education: Li-Fi technology can be used in schools and universities to provide students and teachers with high-speed, secure communication.

The future of Li-Fi technology

Li-Fi technology has the potential to provide data transmission speeds of up to 100 Gbps, which is significantly faster than traditional Wi-Fi. This could lead to new applications in fields like virtual reality, telemedicine, and self-driving cars. Li-Fi technology has a bright future because it has several advantages over traditional Wi-Fi technology. Here are some examples of potential future applications and improvements:
  1. Enhanced security: When compared to traditional Wi-Fi, Li-Fi technology provides a higher level of security because data is transmitted via light waves that cannot pass through solid objects such as walls. This means that only devices in the same room as the transmitter can access the data and reducing the risk of unauthorized access.
  2. Integration with the Internet of Things (IoT): Li-Fi technology is easily integrated with Internet of Things (IoT) devices, allowing for faster and more efficient data transfer between devices. This could open up new possibilities for smart homes, smart cities, and industrial automation.
  3. Improved energy efficiency: Because Li-Fi technology requires fewer components to transmit data, it consumes less energy than traditional Wi-Fi. This could result in lower energy consumption, making it a more environmentally friendly technology.
  4. New infrastructure opportunities: Li-Fi technology can be integrated with existing lighting infrastructure, making the technology more cost-effective and efficient to deploy. This means that Li-Fi could be used in places where traditional Wi-Fi would be impractical, such as hospitals, airplanes, and underwater.


When compared to traditional Wi-Fi technology, Li-Fi technology uses light waves to transmit data rather than radio waves, resulting in a higher data transmission rate, greater bandwidth, and improved security. While some limitations remain, such as the need for a direct line of sight and the installation of new infrastructure, Li-Fi technology has the potential to revolutionize the way we communicate and access information.

Some of the limitations of traditional Wi-Fi technology can be addressed by Li-Fi technology. While some challenges remain, such as limited range and high infrastructure costs, the potential applications of Li-Fi technology are vast and exciting. It will be fascinating to see how this technology evolves and impacts our lives in the future.


Q. Is Li-Fi technology better than Wi-Fi technology?

A. Li-Fi technology has a number of advantages over Wi-Fi technology, including faster data transmission, more bandwidth, and secure communication. It does, however, have some limitations, such as limited range and communication in line of sight.

Q. How fast is Li-Fi technology?

A. The speed of Li-Fi technology is astounding. It has data transfer rates of up to 224 Gbps (gigabits per second), which is significantly faster than traditional Wi-Fi networks. This makes Li-Fi ideal for use in environments requiring high-speed data transfer, such as medical facilities, research labs, and financial institutions.

Q.Is light fidelity (Li-Fi) possible in reality?

A. Yes, light fidelity (Li-Fi) is real and has been proved in a wide range of study environments. Li-Fi technology transmits data using visible light, which is completed by modulating the intensity of light emitted by Lighting systems. A photodetector receives the modulated light and converts it into an electrical signal.

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