As military organisations experiment with different technologies, communication has started to become an essential battlefield. One such technology that has been grabbing headlines recently is Li-Fi, which stands for light fidelity and involves using light rather than radio signals to transfer information. Now, it has been argued that the future of warfare may lie not in weaponry, but in communication.
What is Li-Fi and how it works
Li-Fi is a communication technology that utilises visible light to transmit data. It has a frequency range of around 400 to 800 terahertz (THz). Li-Fi uses LED or laser light sources that can be modulated at high speeds by turning them on and off in nanosecond intervals. Because the light pulses carry data, Li-Fi can transmit large quantities of data in this manner without being visible in the electromagnetic spectrum.
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Li-Fi operates in physical space rather than relying on radio frequency (RF) signals like traditional Wi-Fi. Li-Fi cannot transmit through walls, so there are very minimal opportunities for signals to leak through walls. This characteristic makes Li-Fi well-suited for secure, short-distance communications, in a controlled setting.
Why militaries are testing it
As technology continues to evolve, the communication systems we use have become increasingly at risk of becoming compromised. With increased numbers of people targeting communication systems on battlefields and many different ways to disrupt communications systems (jamming, intercepting, or spoofing), RF communications systems are subject to disruption in today's military environment.
In these situations where multiple different locations exist, there are options such as utilizing Li-Fi technology, which transmits using optical signals rather than RF signals, allows for secure communication in a confined area and cannot be intercepted by using a listener outside the area of transmission. Li-Fi also does not interfere with RF transmissions, therefore allowing communication in environments with strict radio silence or electromagnetic control.
In early experiments performed by researchers and defence agencies in the 2010s, Li-Fi technology was effective in restricted environments such as command and control centers, bunkers, and storage depots. Recently, Li-Fi technology is being adapted for use in various defence industries, including drone swarming, underwater missions, and ground vehicles.
Role in contested environments
Contested environments are battle spaces where communication systems are constantly under threat. In such conditions, RF networks may fail due to jamming or limited reach, particularly in urban zones, underwater regions, or electronic warfare theatres.
Li-Fi provides a secure and interference-resistant option in these scenarios. Its line-of-sight nature limits exposure while ensuring high-speed data transfer over short distances. This makes it useful for mission-critical operations where maintaining secure links is essential.
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India's push towards Li-Fi adoption
India has also reportedly begun exploring Li-Fi for defence applications. Studies conducted by the National Research and Education Network of India in collaboration with IIT Madras highlighted the need for such systems in sensitive areas like border regions and naval bases.
Several initiatives are being supported by organisations such as the Defence Research and Development Organisation (DRDO) and the Defence Innovation Organisation (DIO). Programmes like iDEX (SPARK), iDEX Prime, and the Technology Development Fund are encouraging the development of indigenous Li-Fi systems.
One project involves deploying Li-Fi for secure indoor communication in naval and tactical environments.
DRDO has developed a secure optical communication system designed for use in submarines, bunkers, missile facilities, and forward bases. The system includes a transmitter, a confined optical channel, and a receiver.
Data is first encrypted and converted into light pulses using LEDs or laser diodes. These pulses travel through controlled optical paths such as fibres or sealed corridors, reducing the chance of signal leakage. At the receiving end, the signals are captured, decoded, and delivered to operational systems.
The organisation has also developed a secure Li-Fi backhaul node to link communication points such as command centres and mobile units. This system reduces reliance on RF channels and helps maintain covert communication.
Field trials are currently underway to test performance under varying conditions, including changes in ambient light and physical movement.
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As modern warfare evolves, secure and reliable communication is becoming increasingly important. Li-Fi represents a shift towards technologies that prioritise stealth, speed and resistance to interference.
