Feeds

NEC claims terabit-plus record with 10,000 km hop

High capacity for oceanic links

Internet Security Threat Report 2014

NEC has demonstrated a single fibre link – with no repeaters – running at 1.5 terabits per second over 10,000 km. The company says this is the first time that a single laser source has sent a terabit channel over such a distance.

The lab setup achieved an aggregate of 4 Tbps by binding four “superchannels” together using wavelength division multiplexing (WDM), with a spectral efficiency of 3.6 bits per second per Hertz.

The company says optical superchannels use OFDM (orthogonal frequency division multiplexing) to independently modulate phase-locked carriers. The spectral efficiency of such a setup allows each laser to deliver a higher data rate, NEC claimed.

This next bit is quite a mouthful: “optical multi-tone generation, large-core/ultra low-loss fiber, intradyne digital coherent detection, and digital equalization at higher oversampling, along with well-established technologies such as EDFAs and DP-QPSK modulation. The experiment yielded a 2-dB system margin above the hard decision FEC threshold without using processing-intensive MAP or MLSE algorithms.”

The result was published at the recent Asia Communications and Photonics conference in Shanghai.

Higher capacity on transoceanic links is particularly important for countries like Australia and New Zealand, for whom the “tyranny of distance” creates bottlenecks of speed, price and capacity on international connections. ®

Intelligent flash storage arrays

More from The Register

next story
I'll be back (and forward): Hollywood's time travel tribulations
Quick, call the Time Cops to sort out this paradox!
Musicians sue UK.gov over 'zero pay' copyright fix
Everyone else in Europe compensates us - why can't you?
Megaupload overlord Kim Dotcom: The US HAS RADICALISED ME!
Now my lawyers have bailed 'cos I'm 'OFFICIALLY' BROKE
MI6 oversight report on Lee Rigby murder: US web giants offer 'safe haven for TERRORISM'
PM urged to 'prioritise issue' after Facebook hindsight find
BT said to have pulled patent-infringing boxes from DSL network
Take your license demand and stick it in your ASSIA
Right to be forgotten should apply to Google.com too: EU
And hey - no need to tell the website you've de-listed. That'll make it easier ...
prev story

Whitepapers

Seattle children’s accelerates Citrix login times by 500% with cross-tier insight
Seattle Children’s is a leading research hospital with a large and growing Citrix XenDesktop deployment. See how they used ExtraHop to accelerate launch times.
5 critical considerations for enterprise cloud backup
Key considerations when evaluating cloud backup solutions to ensure adequate protection security and availability of enterprise data.
Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
High Performance for All
While HPC is not new, it has traditionally been seen as a specialist area – is it now geared up to meet more mainstream requirements?
Beginner's guide to SSL certificates
De-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.