Feeds

Bell Labs sets distance record for optical transmissions

2.56Tbps over 4,000km

  • alert
  • submit to reddit

HP ProLiant Gen8: Integrated lifecycle automation

Boffins at Bell Labs, the research and development arm of Lucent Technologies, have doubled the distance record for high-bandwidth, ultra long-distance transmission by sending 2.56 terabits of information per second over a distance 4,000km.

The previous transmission record was 1.60 terabits of information per second over 2,000 km.

The transmission record was achieved using a 64-channel dense wavelength division multiplexing (DWDM) system, where each channel carried information at 40 gigabits per second. DWDM makes it possible to send multiple streams of information down the same optical fibre, using different wavelengths of light.

The increase in speed was achieved using a new coding scheme for high-capacity communications, called differential phase shift keying (DPSK), which was developed by Bell Labs. When coupled with other leading-edge Bell Labs technologies - such as extended L-band amplifiers, Raman amplifiers, forward error correction and optimal dispersion compensation - DPSK allowed boffins to achieve error-free transmission over 4,000 km.

Tim Sullivan, president of Lucent's optical networking group, said that the breakthrough in transmission speeds will ultimately enable lower capital and operational costs for carriers.

A technical paper detailing the advance was presented last week at the Optical Fibre Communications (OFC) conference in Anaheim, California.

This long-distance transmission advance comes after the recent introduction of Lucent's LambdaXtreme Transport optical networking system, which is being field tested by Deutsche Telekom and is generally available to customers. The LambdaXtreme Transport was the first system to enable transmission speeds of up to 40Gbps over at distance up to 1,000km.

Disappointing sales of its earlier generation of 10Gbps optical kit a significant factor in Lucent's recent poor financial performance. It hopes 40Gbps kit will prove to be an attractive proposition for its cash strapped telecoms customers. ®

Related stories

Routers 'best platform for WAN connectivity'
Optical transport market in decline
Nortel touts the light fantastic
Deutsche Telekom takes 40Gbps kit for a spin
Intel buys optical networking trio

Reducing security risks from open source software

More from The Register

next story
Sysadmin Day 2014: Quick, there's still time to get the beers in
He walked over the broken glass, killed the thugs... and er... reconnected the cables*
Amazon Reveals One Weird Trick: A Loss On Almost $20bn In Sales
Investors really hate it: Share price plunge as growth SLOWS in key AWS division
Auntie remains MYSTIFIED by that weekend BBC iPlayer and website outage
Still doing 'forensics' on the caching layer – Beeb digi wonk
SHOCK and AWS: The fall of Amazon's deflationary cloud
Just as Jeff Bezos did to books and CDs, Amazon's rivals are now doing to it
BlackBerry: Toss the server, mate... BES is in the CLOUD now
BlackBerry Enterprise Services takes aim at SMEs - but there's a catch
The triumph of VVOL: Everyone's jumping into bed with VMware
'Bandwagon'? Yes, we're on it and so what, say big dogs
Carbon tax repeal won't see data centre operators cut prices
Rackspace says electricity isn't a major cost, Equinix promises 'no levy'
prev story

Whitepapers

Designing a Defense for Mobile Applications
Learn about the various considerations for defending mobile applications - from the application architecture itself to the myriad testing technologies.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Seven Steps to Software Security
Seven practical steps you can begin to take today to secure your applications and prevent the damages a successful cyber-attack can cause.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.