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Researchers at University College London Set a New World Record for Fastest Internet

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Cables on servers at a data center of the internet exchange point DE-CIX (Deutscher Commercial Internet Exchange) in Frankfurt am Main, western Germany, July 25, 2018.
Cables on servers at a data center of the internet exchange point DE-CIX (Deutscher Commercial Internet Exchange) in Frankfurt am Main, western Germany, July 25, 2018.
Photo: Yann Schreiber/AFP (Getty Images)

Imagine being able to download every single movie and TV show on Netflix in less than a second. Thousands of titles in a literal snap. Researchers at University College London have the ability to do that with a new world record they set for fastest internet—178 terabits a second, or 178,000 Gbps. Lecturer and Royal Academy of Engineering Research Fellow Dr. Lidia Galdino and team collaborated with Xtera and KDDI Research on the project.

According to UCL’s announcement, that speed is “double the capacity of any system currently deployed in the world.” To get that insanely fast speed, UCL researchers used a greater range of wavelengths than what’s typically used in fiber-optic cables and different amplifier technologies to boost the signal. Fiber-optic cables tend to absorb signals (well, the photons that are transmitted through the cable to make the signal) after a few miles because of the material the cables are made out of. Repeaters, which are like a wifi extender, are needed to re-transmit those signals so they can travel for a longer distance. So what the researchers managed to do is not only extend the signal, but also massively amplify it.

Current infrastructure uses a limited spectrum bandwidth of 4.5THz and 9THz commercial bandwidth is just starting to enter the market. 5G on the high-band or millimeter wave spectrum operates on 24 GHz and above and can transmit data up to at rate of 1 to 3 Gbps. But the internet speed Dr. Galdino and team achieved uses a 16.8THz bandwidth to get 178,000Gbps. Makes 5G seem rather slow when you put those numbers side by side.


This kind of system would be cheap to integrate with our existing internet infrastructure, too. According to UCL, upgrading amplifiers at certain intervals would be a fraction of what it would cost to install new optical fiber cables, roughly $21,100 every 25-62 miles (40-100 km) versus $594,000 every 0.62 miles (1 km), based on today’s conversation rate of £1 to $1.32). This sounds like it could be a worthwhile solution to help shrink the digital divide, something that the current pandemic has further illustrated the seriousness of.

“Independent of the covid-19 crisis, internet traffic has increased exponentially over the last 10 years and this whole growth in data demand is related to the cost per bit going down,” Dr. Galdino said to UCL. “The development of new technologies is crucial to maintaining this trend towards lower costs while meeting future data rate demands that will continue to increase, with as yet unthought-of applications that will transform people’s lives,”


Internet traffic has surged due to many now working or attending school from home, in addition to a higher demand of digitally-delivered entertainment like streaming movies and playing videogames online. The internet is holding strong for now, but its clearer than ever that it’s woefully inadequate because many do not have reliable or affordable access to it—an issue long before the current pandemic.

The entire published paper, “Optical Fibre Capacity Optimisation via Continuous Bandwidth Amplification and Geometric Shaping,” is available to read at IEEE Photonics Technology Letters.