Feeds

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

High capacity for oceanic links

3 Big data security analytics techniques

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. ®

Combat fraud and increase customer satisfaction

More from The Register

next story
Dropbox defends fantastically badly timed Condoleezza Rice appointment
'Nothing is going to change with Dr. Rice's appointment,' file sharer promises
Audio fans, prepare yourself for the Second Coming ... of Blu-ray
High Fidelity Pure Audio – is this what your ears have been waiting for?
MtGox chief Karpelès refuses to come to US for g-men's grilling
Bitcoin baron says he needs another lawyer for FinCEN chat
Record labels sue Pandora over vintage song royalties
Companies want payout on recordings made before 1972
Zucker punched: Google gobbles Facebook-wooed Titan Aerospace
Up, up and away in my beautiful balloon flying broadband-bot
Apple DOMINATES the Valley, rakes in more profit than Google, HP, Intel, Cisco COMBINED
Cook & Co. also pay more taxes than those four worthies PLUS eBay and Oracle
Number crunching suggests Yahoo! US is worth less than nothing
China and Japan holdings worth more than entire company
prev story

Whitepapers

Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Top three mobile application threats
Learn about three of the top mobile application security threats facing businesses today and recommendations on how to mitigate the risk.
Combat fraud and increase customer satisfaction
Based on their experience using HP ArcSight Enterprise Security Manager for IT security operations, Finansbank moved to HP ArcSight ESM for fraud management.