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

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 …

[Antidisestablishmentarianist]

Capacity isn't the bottleneck in NZ it's price. More links are being added by different companies not to add needed capacity but to bring competition and lower prices. It'll be a long time before these sorts of speeds are needed down there.

[E 2]

"tyranny of distance"

What the hey are all those people doing out there in the south south-Pacific, acting like Europeans?!?!

Join Asia like God meant ya to!

[Surreal]

Ours is bigger.

It wasn't over anything like 10K kilometers, but we've recently documented a 19Tbps data transmission. http://www.youtube.com/watch?v=BKE4HRsMBVE

[Woodgie]

That is truly awesome

I think I can implement that between floors in my building with minimal loss in bandwidth merely by sending larger packets!

[Mage]

So

Given that a fibre cable in a duct is actually many of these 4Tbps fibres, that means one street cabinet with only a SINGLE cable could be equivalent to a Million Mobile phone masts.

[Bob H]

There are about 5600 phone exchanges in the UK, I believe there are about 70-80 cabinets per exchange and that means 420,000 nodes. So, if a 4Tbit/sec link is desired that needs two ends, so 840000 adaptors. Assuming you could get the adaptors for £500 each (which is ridiculous because that is the cost of a 10G adaptor) then the cost could be £420m. But as the adaptors are likely to be well over £10,000 each that would actually be £8.4bn plus cabling...

[Dazed and Confused]

Yes, but ...

When can I have it as a home broadband service?

And how fast can I download Blurays @ 1Tb ? :-)

[Anonymous Coward]

1 Tb/s / 50GB =

About 2.5 dual layer discs per second.

[Anonymous Coward]

Yeah but No but

What about disk I/O ?

[TeeCee]

Easy. Just get a big drum of fibre and keep it going round in circles on there 'til you can stream it off........

[Jock in a Frock]

Disk I/O ?

Never mind that, I need to hook it up to my 5-unit punch tape unit for permanent backup.

50bps FTW!

I work as an engineer for a major UK telco, commissioning DWDM systems, and even I find these number mind-boggling.

[Babai]

FYI (only)

optical multi-tone generation -> multiple freq generation (for WDM)

large core -> large diameter of light carrying portion of optical fiber (generally single tone requires narrow core, and multi-tone requires wider core to propagate all wavelength properly)

ultra low-loss fiber -> usual

digital coherent detection -> receiver side reconstructs clock freq/phase from the incoming signal itself. So receiver would not require to generate a separate & discrete clock for synchronization.

digital equalization-> different wavelength gets attenuated differently based on its freq/wavelength. So equalization will make all wavelength with same amplitude (as for multi-tone signal)