【光纤速度突破1Tbps 每秒传输30部蓝光片】

【光纤速度突破1Tbps  每秒传输30部蓝光片】据悉,诺基亚贝尔实验室、团队T-Labs以及慕尼黑工业大学联手实现了1Tbps的光纤传输速度,以使光网络操作更接近香农极限。诺基亚首席技术官表示:“这样的光网络支持大量数据中心互联,能为现代网络提供所需的灵活性和性能,从而为服务供应商和企业提供了极大的便利。”

光纤

Sure, researchers have been showing off terabit data speeds in fiber opticsfor years, but they've seldom been practical. That exotic technology may work over long distances, but it can quickly fall apart when you throw typical network loads in the mix. However, it's about to become much more practical. Nokia Bell Labs, Deutsche Telekom and the Technical University of Munich have shown off 1Tbps data speeds in a field trial that involved "real conditions," with varying channel conditions and traffic levels.

The secret was a new modulation technique, Probabilistic Constellation Shaping. Instead of using all the networking's constellation points (the "alphabet of the transmission") equally, like typical fiber, it prefers those points with lower amplitudes -- the ones that are less susceptible to noise. That helps transmissions reach up to 30 percent further, since you can adapt the transmission rate to fit the channel. It's so effective that the team got close to the theoretical peak data speeds possible for the fiber connection.

You're likely not going to see these terabit fiber lines in regular use for a while, since there's a large gap between a field test and making commercially available lines. The timing might be ideal, mind you -- 5G cellular data is just gathering momentum, and telecoms will need gobs of bandwidth to cope with the increased demands. A realistic 1Tbps fiber option would make sure that the internet's wired backbones don't collapse under the load.

https://www.engadget.com/2016/09/18/nokia-terabit-fiber-optic-speeds/


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