The world's largest capacity submarine cable data transmission speed may be 20% faster than theoretically imagined. Recently, an experiment using 16QAM modulation achieved a record transmission speed of 26.2 Terabits on a 4,000-mile transatlantic cable jointly owned by Facebook and Microsoft, which means that the theoretical performance of 20Tbps for each of the 8 fibers of each pair of cables has increased by 20%.
These speeds have been proven on the MAREA cable, which is currently the world's largest submarine cable with a total theoretical volume of 160 Tbps. The cable is operated by Telxius and runs between Bilbao, Spain, and Virginia Beach, Virginia, which has become a popular node in the new data center.
This test has a double meaning. First, the new method has been proven on existing cables, and capacity upgrades may be possible without having to spend hundreds of millions of dollars laying new cables. The second is to prove the speed increase on such a long distance cable.
However, it will take some time before we see such a speed spread. Although the transmission speed of 20Tbps was previously considered to be possible on this line, the actual average transmission speed of the Marea cable is currently only 9.5 Tbps, which indicates that there are more practical obstacles to be overcome.
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