Alcatel-Lucent and BT announce 1.4Tb/s trials

Share this on social media:

Alcatel-Lucent and BT have announced trial speeds of up to 1.4Tb/s with a record spectral efficiency of 5.7 bits per second per Hertz (b/s/Hz) on an existing core fibre connection. The companies say this is believed to be the fastest speed ever achieved in commercial grade hardware in a real-world environment, and is equivalent to transmitting 44 uncompressed HD films in a single 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 50 gigahertz (GHz). 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 was conducted through the overlaying of an 'alien super channel' comprised of seven 200 gigabits per second (Gb/s) channels bundled together to provide a combined capacity of 1.4Tb/s. Reducing the spectral spacing between the channels from 50GHz to 35GHz using the 400Gb/s Photonic Services Engine (PSE) technology on the 1830 Photonic Service Switch (PSS), meant that spectral efficiency was 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). The super channel is 'alien' because it operates transparently on top of BT’s existing optical network.

BT says the trial has demonstrated how flexgrid could increase the company’s core network capacity using the existing infrastructure, reducing the expense of laying more fibre.

 

Recent News

19 July 2021

A team of researchers from NICT in Japan has set a new world record for internet speed at 319Tb/s.

16 July 2021

UK operator Openreach has conducted the UK’s first trials of a new 25G PON technology from Nokia.

08 July 2021

A team of researchers has developed a temporal compression system that allows an equivalent increase in the number of bits transmitted by light in a fibre network.

14 June 2021

A team of researchers at The Cambridge Research Laboratory of Toshiba Europe have demonstrated quantum communications over 600km of optical fibres.