Path: EDN Asia >> News Centre >> Communications/Network >> Alcatel-Lucent, BT tout speed of core fibre connection
Communications/Network Share print

Alcatel-Lucent, BT tout speed of core fibre connection

27 Jan 2014

Share this page with your friends

Alcatel-Lucent and BT said a field trial yielded speeds of up to 1.4Tb/s, with a record spectral efficiency of 5.7 bits per second per Hertz (b/s/Hz), for an existing core fibre connection. The companies said this is the fastest speed ever achieved in commercial grade hardware in a real-world setting and is tantamount to transmitting 44 uncompressed HD films in one second.

The field trial, conducted over an existing fibre link between the BT Tower in London and BT's Adastral Park research campus in Suffolk, used a new 'flexible grid' infrastructure (Flexgrid) to vary the gaps between transmission channels, usually set at 50GHz. By increasing the density of channels on the fibre, this approach achieved up to 42.5 per cent greater data transmission efficiency compared to today's standard networks.

The trial demonstrated that use of the Flexgrid approach can increase BT's core network capacity using existing optical fibres, potentially reducing the expense of laying more fibre as bandwidth demands grow. This could allow BT to more easily scale its core network capacity to meet consumer and business demands for more bandwidth-hungry services such as streaming video, whilst more efficiently using its existing core fibre infrastructure.

The trial was conducted through the overlaying of an "Alien Super Channel" comprised of seven 200 Gb/s channels bundled together to provide a combined capacity of 1.4Tb/s. By reducing the spectral spacing between the channels from 50GHz to 35GHz using the 400 Gb/s Photonic Services Engine (PSE) technology on the 1830 Photonic Service Switch (PSS), spectral efficiency is enhanced by almost 43 per cent. The 1830 PSS can be used as an optical extension shelf of the 7750 Service Router (SR) and the 7950 Extensible Routing System (XRS). Flexgrid is the key to creating high-capacity, spectrally efficient super channels. The super channel is "alien" because it operates transparently on top of BT's existing optical network.

Dr Tim Whitley, BT's MD of Research and Innovation said: "BT has a long history of leading innovation in telecommunications, from the earliest days of the electric telegraph to today's global fibre networks. These trials continue that tradition, as we work with Alcatel-Lucent to push the boundaries of fibre technology, allowing us to support the ever increasing bandwidth required by our customers, and deliver new and exciting services which rely on fast, data-hungry applications."




Want to more of this to be delivered to you for FREE?

Subscribe to EDN Asia alerts and receive the latest design ideas and product news in your inbox.

Got to make sure you're not a robot. Please enter the code displayed on the right.

Time to activate your subscription - it's easy!

We have sent an activate request to your registerd e-email. Simply click on the link to activate your subscription.

We're doing this to protect your privacy and ensure you successfully receive your e-mail alerts.


Add New Comment
Visitor (To avoid code verification, simply login or register with us. It is fast and free!)
*Verify code:
Tech Impact

Regional Roundup
Control this smart glass with the blink of an eye
K-Glass 2 detects users' eye movements to point the cursor to recognise computer icons or objects in the Internet, and uses winks for commands. The researchers call this interface the "i-Mouse."

GlobalFoundries extends grants to Singapore students
ARM, Tencent Games team up to improve mobile gaming


News | Products | Design Features | Regional Roundup | Tech Impact