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. ®

Choosing a cloud hosting partner with confidence

More from The Register

next story
Spies, avert eyes! Tim Berners-Lee demands a UK digital bill of rights
Lobbies tetchy MPs 'to end indiscriminate online surveillance'
Inequality increasing? BOLLOCKS! You heard me: 'Screw the 1%'
There's morality and then there's economics ...
How the FLAC do I tell MP3s from lossless audio?
Can you hear the difference? Can anyone?
Google hits back at 'Dear Rupert' over search dominance claims
Choc Factory sniffs: 'We're not pirate-lovers - also, you publish The Sun'
While you queued for an iPhone 6, Apple's Cook sold shares worth $35m
Right before the stock took a 3.8% dive amid bent and broken mobe drama
4chan outraged by Emma Watson nudie photo leak SCAM
In the immortal words of Shaggy, it wasn't me us ... amirite?
prev story

Whitepapers

Providing a secure and efficient Helpdesk
A single remote control platform for user support is be key to providing an efficient helpdesk. Retain full control over the way in which screen and keystroke data is transmitted.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.
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.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
Secure remote control for conventional and virtual desktops
Balancing user privacy and privileged access, in accordance with compliance frameworks and legislation. Evaluating any potential remote control choice.