Team in Denmark breaks data transmission rate over single fiber cable—43 terabits per second

July 31, 2014 by Bob Yirka report
Team in Denmark breaks data transmission rate over single fiber cable—43 terabits per second

A team at Denmark's Karlsruhe Institute for Technology has broken the data transmission rate record previously set by a team in Germany (32 terabits per second). In this new effort, the team (with the High-Speed Optical Communications Group) achieved a rate of 43 terabits per second using just one laser and one fiber cable.

The researchers note that increasing for digital data is becoming increasingly important as the Internet continues to grow at a blazing pace. They also note that the Internet infrastructure has been found to contribute to more than two percent of global emissions of carbon dioxide. This suggests, they note, that if higher transmission rates are not achieved, Internet related activities will contribute an increasingly larger share of global emissions and associated planetary warming. To prevent that from happening, more data needs to be sent over the same number of lines as exist today (or better yet, fewer).

In their announcement describing their achievement, the team notes that they have also in the past achieved transfer rates of 1 petabit (1000 terabits) when using multiple (hundreds) of lasers.

To break the record, the team used a new type of developed by Japanese telecom giant NTT—instead of a single glass core, the new cable has seven. Data is sent over the fiber from a single laser, which means the signal must be split prior to transmission and then reassembled once received.

For a bit of perspective, sending 43 of data in one second would be like backing up the contents of five full 1 TB hard drives—in just one second (excluding reading, writing, etc., of course).

Internet users shouldn't get their hopes up just yet, however, there is still more research to be done on higher rate fiber transfer, and once that happens, the international standards body will have to pick a winner, and then, hardware makers will have to create new hardware—all of which means, it's likely to be a while before such fast transfer rates make it to the Internet backbone, much less our individual devices.

The achievement by the team has been verified by an independent group and their findings have been detailed and presented as a "post-deadline paper" at the International Conference CLEO 2014.

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1 / 5 (1) Jul 31, 2014
It doesn't seem fair to compare apples with oranges. If this system is using 7 fiber cores, then it really isn't a single line. It is 7. Did the Germany solution use 1 or more?

5 / 5 (3) Jul 31, 2014
The Karlsruhe Institute of Technology is in ... Karlsruhe, which is a city in the southwest of GERMANY. So either a Danish team broke the record at the German Institute or you guys got the name of the respective institution wrong. Please clarify! Also: Link to source?
5 / 5 (5) Jul 31, 2014
Good catch:
The record breakers were from the technical university of Denmark
(The former record holders were the guys from KIT which is the Karlsruhe institute of technology)
5 / 5 (3) Jul 31, 2014
43 tbit with a single laser, does that mean no bundling of wavelengths?

And how do they get more bandwidth, just by splitting a signal from a single source?

More details please!

Or link to source in case you (the writer) does not understand anything of this.
5 / 5 (1) Jul 31, 2014
Just out of curiosity, how do they detect the signal when it's being modulated at such an insane rate? It's hard to imagine how you would capture and encode a light signal that varies on a scale less than 1 picosecond.
5 / 5 (1) Jul 31, 2014
From their site
I glean that they us an "on-chip SDM Coupler" (where I suppose SDM stands for "space division multiplexer")

Here's a neat site that has an image of what type of encoding strategies are used (halfway down)

They seem touse the whole bag of tricks
- phase
- frequency
- orthogonal carrier wave
- amplitude
- quadrature
- and space (i.e. parallelization into 7 sub-areas of the fiber which they call 'multi core' alternative approach to the regular multi-mode)

Hollow core seems to be able to push this even higher - if they get the transmissionloss issue fixed.
not rated yet Aug 04, 2014
Must be DTU (Danmarks Tekniske Universitet) in Lyngby, Denmark.
not rated yet Aug 04, 2014
And in English here:

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