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Researchers Speed Fiber Lines Up Significantly
Twin Light Beams Reach 400 Gbps Over 8k Miles
by Karl Bode 08:49AM Thursday Jul 11 2013
Last month researchers posted to Nature Photics (via the BBC) stating that they've discovered a new approach to sending data via light fiber strands that could speed things up significantly for fiber lines. According to researchers at Bell Laboratories, they've found a way to achieve 400 Gbps over distances as long as 8,000 miles by sending twin pairs of phase-conjugated light beams down fiber strands. Their solution helps counter the Kerr nonlinearity limit that has restricted fiber speeds previously. "This concept, looking back, is quite easy to understand, but surprisingly, nobody did this before," insists Bell researcher Xiang Liu.

topics flat nest 



Too bad the ISPs will still have caps

Is Iceland still looking to be the datacenter capitol of the world?

Can FTTH finally go up to 1Gbps symmetrical as the standard speed?



Re: Too bad the ISPs will still have caps

The interesting thing about FTTH is that it's not all created equal. You probably understand this from your comment. Many don't.

In a passively split FTTH deployment, the one fiber going back to the ISP's switch may be a 1 Gbps port, but it is passively split amongst however many subscribers they've decided upon, 1, 4, 8, 16, 32, 64, etc. So just because an ISP runs fiber to your premise, doesn't mean it is able to support 1 Gpbs.

Then again, most ISP's will tell you that nobody even wants anything more than 3 Mbps, otherwise they'd offer it.



Re: Too bad the ISPs will still have caps

Just because the fiber is running multiple waves does NOT mean its capacity is decreased. Just the opposite. (This of course assumes you mean actually using a wave per customer and not a PON-type solution.)
Warner Robins, GA
1. Probably not, as they might not have the electrical production capability to support such an operation unless they destroy the environment of the country.

2. Not in the near term, as the switches and other installed gear in existence do not support it. LUSFiber, for example, only offers 1Gbps symmetrical to new customers, who are capable of being connected to the network in certain locations, as the older fiber modems can only reliably handle 100Mbps symmetrical, and not all service areas support 1Gbps. As the network gear fails or ages out, it will be replaced with newer gear that can properly support 1Gbps to each potential customer. Much of the existing gear has several years of useful life ahead, so it will not be replaced just to build a dedicated capacity 1Gbps symmetrical FTTH network to every potential customer. In addition,for many cable companies, getting all customers on a consistently reliable 100Mbps symmetrical service may prove to be more important than the mystical 1Gbps. The upcoming DOCSIS 3.0 cable modems are supposed to be able to handle this.


Limestone, ME

8000 MILES

Very NICE...
This makes getting to that pesky last mile a lot easier.

Too bad nobody cares much about the last mile.


Arlington, TX

Re: 8000 MILES

said by buzz_4_20:

Very NICE...
This makes getting to that pesky last mile a lot easier.

Too bad nobody cares much about the last mile.

capacity vs. cost? it is not about the capacity is the problem it is the fact that the ISP's don't want to remove all of their gear installed during the 90s especially for the cable company as going fiber only would kill of SDV and require all boxes to be replaced if they wanted to offer unlimited channels.


Flanders, NJ

Re: 8000 MILES

And thus why broadband penetration is still atrocious in the US.

Profits, profits, profits, continuing to ruin the world.