Light Receiver For Secure Communication

The light receiver fixes signals in weather, helping send messages in places where networks don’t work, like remote areas.

Researchers from Polytechnic University of Milan have developed a new type of optical receiver capable of restoring chaotic signals in free-space optical communication links disrupted by atmospheric turbulence. This breakthrough uses a system of optical micro-antennas embedded in a programmable photonic chip, allowing the receiver to adapt in real time and preserve the integrity of the signal, even in challenging environmental conditions.

The study demonstrates a key advancement in chaos-based encryption, a method where a message is hidden within a light signal that appears random and nearly impossible to decode. While this approach is highly secure in theory, real-world applications have struggled due to the unpredictable nature of the atmosphere, which distorts the signal and undermines the chaos needed for secure transmission.

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To overcome this, the new receiver captures the incoming light from multiple angles using its array of micro-antennas. These components act like multiple viewpoints, feeding data to the photonic chip, which then recalibrates itself on the fly to reconstruct the original chaotic signal. This real-time adaptability allows the system to maintain performance even in the presence of rain, wind, or airborne particles.

This innovation opens the door for reliable, high-speed, and secure optical communications in environments where traditional systems are often unreliable or unavailable. It holds particular promise for use in remote areas, disaster zones, and other scenarios where secure, wireless links are critical. By fully restoring the complex characteristics of chaos in optical signals, the system offers a powerful new tool for communication in hostile conditions.

As Francesco Morichetti, head of the Photonic Devices Lab at the Politecnico di Milano, pointed out, “In remote areas or emergency zones, places where traditional networks fail, a chaos-based, turbulence-resistant system could provide a secure connection when it’s most needed.”