New Internet Speed World Record: 178 Terabits a Second

Fast Internet Concept

Dr. Lidia Galdino’s research team at UCL achieved a mind-boggling data transmission rate of 178 terabits per second, equivalent to downloading the entire Netflix library in less than a second.

The world’s fastest data transmission rate has been achieved by a team of University College London engineers who reached an internet speed a fifth faster than the previous record.

Working with two companies, Xtera and KDDI Research, the research team led by Dr. Lidia Galdino (UCL Electronic & Electrical Engineering), achieved a data transmission rate of 178 terabits a second (178,000,000 megabits a second) – a speed at which it would be possible to download the entire Netflix library in less than a second.

The record, which is double the capacity of any system currently deployed in the world, was achieved by transmitting data through a much wider range of colors of light, or wavelengths, than is typically used in optical fiber. (Current infrastructure uses a limited spectrum bandwidth of 4.5THz, with 9THz commercial bandwidth systems entering the market, whereas the researchers used a bandwidth of 16.8THz.)

To do this, researchers combined different amplifier technologies needed to boost the signal power over this wider bandwidth and maximized speed by developing new Geometric Shaping (GS) constellations (patterns of signal combinations that make best use of the phase, brightness and polarisation properties of the light), manipulating the properties of each individual wavelength. The achievement is described in a new paper in IEEE Photonics Technology Letters.

The benefit of the technique is that it can be deployed on already existing infrastructure cost-effectively, by upgrading the amplifiers that are located on optical fiber routes at 40-100km (25-62mi) intervals. (Upgrading an amplifier would cost £16,000, while installing new optical fibers can, in urban areas, cost up to £450,000 a kilometer.)

The new record, demonstrated in a UCL lab, is a fifth faster than the previous world record held by a team in Japan.

Dr. Lidia Galdino

Dr. Lidia Galdino (UCL Electronic & Electrical Engineering). Credit: UCL

At this speed, it would take less than an hour to download the data that made up the world’s first image of a black hole (which, because of its size, had to be stored on half a ton of hard drives and transported by plane). The speed is close to the theoretical limit of data transmission set out by American mathematician Claude Shannon in 1949.

Lead author Dr. Galdino, a Lecturer at UCL and a Royal Academy of Engineering Research Fellow, said: “While current state-of-the-art cloud data-center interconnections are capable of transporting up to 35 terabits a second, we are working with new technologies that utilize more efficiently the existing infrastructure, making better use of optical fiber bandwidth and enabling a world record transmission rate of 178 terabits a second.”

Since the start of the COVID-19 crisis, demand for broadband communication services has soared, with some operators experiencing as much as a 60% increase in internet traffic compared to before the crisis. In this unprecedented situation, the resilience and capability of broadband networks has become even more critical.

Dr. Galdino added: “But, 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. 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.”

This work is funded by the Royal Academy of Engineering, The Royal Society Research grant, and the EPSRC program grant TRANSNET (EP/R035342/1).

10 Comments on "New Internet Speed World Record: 178 Terabits a Second"

  1. “a speed at which it would be possible to download the entire Netflix library in less than a second.”

    that doesn’t sound right, the whole netflix library is <~22.25TB?

  2. 178 terabits is more than 22TB

  3. wow

  4. Cyan sus, vote him | November 13, 2020 at 2:14 pm | Reply

    So, what if this went commercial, regardless of prices?


    Even a 3 year old estimate puts it around minimum of 80-100TB of content. Definitely not 22TB.

  6. Terabits vs Terabytes. Bandwidth is measured in “bits” per second whereas information storage is “bytes”. Assuming the Netflix library would be around 100 terabytes, at 178 terabits per second (after converting 178 terabits to gigabits which would equal 178000 gigabits) it would take 4 seconds to download the entire library so the article really wouldn’t be too far off (according to

  7. 8 Bits is 1 Byte, so you always divide by 8. Thank me later 🙂

  8. 178 terabits is just crazy i can imagine the largest file in the world in just a second

  9. Abogado DUI Lexington VA | June 12, 2023 at 2:05 am | Reply

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