Nokia and Facebook Are Touting Their Undersea Exploits
The two companies' submarine cable is setting spectral efficiency records
Nokia and Facebook are setting speed records under the sea.
The two companies revealed the results of multiple field trials of their 5,500-kilometer (3,418-mile) submarine cable between New York and Ireland, saying that the cable used new probabilistic constellation shaping from Nokia Bell Labs and shaped 64-QAM (quadrature amplitude modulation), setting a spectral efficiency record of 7.46 b/s/Hz (bits per second per Hertz) and boosting the system’s capacity by nearly 2.5 times.
Nokia and Facebook also tested an 11,000-kilometer (6,835-mile) round-trip submarine transmission using shaped 64-QAM, and the two companies reported a record spectral efficiency of 5.68
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