Moving to 100G Networks Adds New Complexities

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Online video viewing is growing faster than you think. In just the past three years, the number of Americans watching online videos has grown more than 61 percent, reports Pew Internet.

Video’s growth rate along with other data-intensive web applications translates into rigorous capacity demands on current transport networks. To prepare for the data management onslaught, next-generation optical technologies are looking beyond 10 GB/s networks to the scalability of 40 GB/s, 100 GB/s, and even higher-bandwidth networks.

To utilize higher bandwidth effectively, advanced modulation formats and detection schemes, different than on 10 GB/s networks, are necessary to provide resilience against non-linear effects and optical noise. As network rates increase, both factors can significantly affect signal quality.

These high-capacity networks require a field of coherent technologies to manage the complexities of data transport, such as:

Coherent detection technologies – With all signal information now visible, linear distortions are compensated with digital signal processing. Plus, it’s possible to double the transported bits with polarization division multiplexing (PDM).

Improve tolerance to optical noise – Depending on the size of the network and whether managing long-distance transmissions or high-capacity networks, different modulation formats are recommended.

Last year, Alcatel-Lucent performed a field trial of a 112 GB/s transmission with Telefónica in Spain. While the capacity was remarkable, what was more impressive was how smoothly they upgraded to the high-capacity network, loading it with traffic-bearing 10 GB/s channels.

Check out for their recent announcements about 100G.

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