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New distance record for 400 Gb/s data transmission

Date:
March 12, 2013
Source:
The Optical Society
Summary:
Scientists have devised a new patent-pending technique enabling 400 Gb/s signals to be sent over today's 100 gigahertz-grid optical networks over ultra-long distances for the first time.

Measured optical spectrum of the eight 100GHz-spaced 495Gb/s WDM signals at the launch into the transmission fiber. The insets are measured constellation diagrams before and after transmission. QPSK: quadrature phase shift keying; QAM: quadrature amplitude modulation; WDM: wavelength division multiplexed.
Credit: Image courtesy AT&T Labs

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 measures to squeeze next-generation performance out of current-generation systems.

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To that end, a team from AT&T has devised a new patent pending technique enabling tuning of the modulation spectral efficiency, which allows, for the first time, 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.

The researchers, led by optical transmission system expert Xiang Zhou of AT&T Labs-Research in Middletown, N.J., will describe their work next week at OFC/NFOEC 2013.

In the system, Nyquist-shaped 400Gb/s signals with tunable spectral efficiency were generated using modulated subcarriers. Eight 100 GHz-spaced, 400 Gb/s wavelength-division-multiplexed signals were combined and then transmitted over a re-circulating transmission test platform consisting of 100-km fiber spans.

Using the new modulation technique and a new low-loss, large-effective area fiber from OFS Labs, the team transmitted the signals over a record-breaking 12,000 kilometers (roughly 7500 miles) -- surpassing their own previous distance record (using the 50 gigahertz-grid) by more than 9000 km.

"This result not only represents a reach increase by a factor of 2.5 for 100 GHz-spaced 400 G-class WDM systems, it also sets a new record for the product of spectral efficiency and distance," says Zhou. Compared to modulation techniques currently used, he says, "our method has the unique capability to allow tuning of the modulation spectral efficiency to match the available channel bandwidth and maximize the transmission reach, while maintaining tolerance to fiber nonlinearities and laser phase noise, both of which are major factors limiting performance for high-speed optical systems."


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The above story is based on materials provided by The Optical Society. Note: Materials may be edited for content and length.


Cite This Page:

The Optical Society. "New distance record for 400 Gb/s data transmission." ScienceDaily. ScienceDaily, 12 March 2013. <www.sciencedaily.com/releases/2013/03/130312134652.htm>.
The Optical Society. (2013, March 12). New distance record for 400 Gb/s data transmission. ScienceDaily. Retrieved October 25, 2014 from www.sciencedaily.com/releases/2013/03/130312134652.htm
The Optical Society. "New distance record for 400 Gb/s data transmission." ScienceDaily. www.sciencedaily.com/releases/2013/03/130312134652.htm (accessed October 25, 2014).

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