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AT&T 400 Gb/s Data Transmission Shatters Old Distance Record:
As network carriers debate the next Ethernet standard, and whether transmission speeds of 400 gigabit per second or 1 terabit per second should be the norm, engineers are working on new ways to squeeze next-generation performance out of current-generation systems.
A team from AT&T has devised a new technique that enables tuning of the modulation spectral efficiency and allows 400 Gb/s signals to be sent over today’s 100 gigahertz-grid optical networks over ultra-long distances.
Spectral efficiency is the information rate that can be transmitted over a given bandwidth, and measures how efficiently the available frequency spectrum is utilized.
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