Li-Fi TECHNOLOGY

Source: Moneycontrol

Disclaimer: Copyright infringement not intended.

Context

• Velmenni, a telecom startup, received a grant from the Ministry of Defence (MoD) under the Innovations for Defence Excellence (iDEX) initiative.
• Objective: To strengthen wireless communication specifically for the Indian Navy, addressing unique communication challenges in harsh environments.

Details

Advantages for the Indian Navy

• Enhanced Data Transmission:
  • Speed: Provides high-speed connections, essential for real-time communication and data transfer.
  • Bandwidth: Offers a broader spectrum than radio frequencies, reducing congestion.
• Security:
  • Physical Barriers: Operates using visible light, ensuring data transmission even in shielded or underground areas where radio frequency (RF) signals cannot penetrate.
  • Interference: Immune to electromagnetic interference, maintaining secure communications in electronic warfare environments.
• Operational Efficiency:
  • Mission-Critical Operations: Enables seamless communication and coordination during critical missions, enhancing overall operational efficiency.
  • Connectivity: Ensures uninterrupted connectivity in areas where RF communication is challenging or compromised, such as underwater or in secure facilities.

Strategic Alignment with Government Initiatives

• iDEX Programme:
  • Designed to foster innovation within India’s defense sector by incorporating advanced technologies like Li-Fi.
  • Aligns with Make in India, Startup India, and the Atal Innovation Mission (AIM) to stimulate homegrown technological advancements.

Light Fidelity (Li-Fi)

• Li-Fi (Light Fidelity) is a wireless communication technology that uses light to transmit data.
• Origin: Coined by Professor Harald Haas from the University of Edinburgh during a TED Talk in 2011.
• Unlike Wi-Fi, which uses radio waves, Li-Fi uses visible light from LEDs to transmit data.

How Li-Fi Works

• Basic Principle: Data is transmitted through light by modulating the intensity of the LED light bulb, which is then received by a photodetector.
• Components:
  • LED Light Bulb: Acts as a transmitter by modulating light intensity.
  • Photodetector: Receives the modulated light and converts it back to electrical signals.
  • Processor: Decodes the electrical signals into data.
• Data Transmission: High-speed on/off switching of LEDs at nanosecond speeds allows the transmission of data.

Advantages of Li-Fi

• Speed: Capable of speeds up to 224 Gbps under laboratory conditions.
• Bandwidth: Utilizes the visible light spectrum, which is 10,000 times larger than the radio spectrum.
• Security: Light cannot penetrate walls, reducing the risk of unauthorized access.
• Interference: No electromagnetic interference, making it suitable for environments like hospitals and airplanes.
• Energy Efficiency: LEDs are energy-efficient and can serve dual purposes of lighting and communication.

Limitations of Li-Fi

• Line of Sight: Requires a direct line of sight between the LED and the receiver.
• Distance: Limited range compared to Wi-Fi due to light diffusion.
• Infrastructure: Requires installation of LED light bulbs and photodetectors, which may be costly.

Applications of Li-Fi

• Internet of Things (IoT): Facilitates communication between IoT devices.
• Healthcare: Provides secure and interference-free data transmission in hospitals.
• Aviation: Offers high-speed internet in airplanes without causing interference.
• Underwater Communication: Enables data transmission underwater, where radio waves are less effective.
• Smart Lighting: Integrates data communication with lighting infrastructure in smart cities.

Comparison of Various Wireless Communication Technologies

Sources:

Moneycontrol