BY OPTICA OCTOBER 7, 2024
Collected at: https://scitechdaily.com/revolutionizing-space-communication-424gbit-s-achieved-with-cutting-edge-plasmonic-tech/
High-speed free-space data transmission could improve connectivity for space missions.
Researchers at ETH Zurich have achieved record-breaking data transmission speeds using plasmonic modulators, promising advancements in space communication and potential global high-speed internet access. With speeds potentially reaching 1.4 Tbit/s, this technology could change how the world connects.
Scientists have achieved data rates as high as 424Gbit/s across a 53-km (33-mile) turbulent free-space optical link using plasmonic modulators—devices that use special light waves called surface plasmon polaritons to control and modify optical signals. This new research establishes the foundation for high-speed optical communication links that transmit data through open air or space.
Enhancing Space Missions With Faster Data Transfer
Free-space-optical communication networks could benefit space exploration by providing high-speed, high-capacity data transmission with lower latency and less interference than traditional radio frequency communication systems. This could result in more efficient data transfer, improved connectivity, and enhanced capabilities for space missions.
Laurenz Kulmer from the Leuthold group of ETH Zurich presented this research at Frontiers in Optics + Laser Science (FiO LS).
“High-speed free-space transmission is an option to connect the world, or it may serve as a backup if underwater cables break,” said Kulmer. “Nevertheless, it is also a step towards a new cheap high-speed internet that may connect all locations across the world. This way it may contribute towards a stable, high-speed internet for millions of people who are currently unconnected.”
Advantages and Future Prospects of Plasmonic Modulators
Plasmonic modulators are ideal for space communication links because they are compact while also operating at high speeds over a wide temperature range with low energy consumption.
In free-space optical outdoor experiments, the researchers achieved information rates of up to 424 Gbit/s below a 25% SD FEC threshold — the point at which a system can still fix errors in transmitted data despite interference or noise. Experiments using a plasmonic IQ modulator in a standard fiber system achieved an even higher throughput of up to 774 Gbit/s/pol while staying below a 25% SD FEC threshold.
Based on these results, the researchers say that combining plasmonic modulators with coherent free-space optical communication could help increase overall throughput, with speeds potentially reaching 1.4 Tbit/s. The findings also show that it is favorable to operate free-space optical links at the highest speeds, rather than using higher order modulation formats and low speeds. With additional improvements in device design and photonic integration, the researchers say it should be feasible to reach polarization multiplexing data rates above 1 Tbit/s for each polarization channel.
“In a next step we are going to test the long-term reliability of our devices,” said Kulmer. “High-speed performance has been shown, but we have to make sure they can operate for years to come in the harshest of environments, space.”
Meeting: Frontiers in Optics + Laser Science Conference
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