A lot of technical jargon in this article but the gist of it is in this paragraph:

This world's first demonstration of the Bell Labs' pioneered MIMO-SDM technique has the potential to increase today's 10 to 20 Terabit-per-second fiber capacities to Petabit-per-second capacity - the equivalent of 1,000 Terabits/s. The successful 6x6 MIMO-SDM real-time experiment using six transmitters and six receivers in combination with real- time digital signal processing was conducted over a 60-km-long coupled-mode fiber in Bell Labs' global headquarters in New Jersey.

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