Print 16 comment(s) - last by Chemical Chris.. on Nov 9 at 12:52 AM

Super fast networking gear promises 2000 times faster downloads  (Source: BBC)
2000 times faster downloads with little extra cost sounds pretty darn good

A team of researchers from Bangor University in the UK believes that they can create broadband speeds about 2000 times faster than we have today without a massive increase in costs. The team has managed to reach speeds of 20 GB of data downloaded every second. With that data throughput, you could download a full-length HD movie in about 10 seconds.

The team is now involved in a three-year project with the goal of making the technology commercially viable. The technology the researchers have developed uses fiber-optic cable. The problem with fiber-optic networks is that as the length of the cable increases, errors become more common in an effect known as dispersion.

While many in the industry have been investigating simply adding more physical fiber-optic strands inside cables to allow for the carrying of more data, increasing the size of fiber-optic cable gets expensive.

"The trouble is, that can all cost a lot of money," said Dr Roger Giddings, one of the team running the Ocean project in north Wales. "So the focus for the Ocean project is really to find out if we can do it in a cost-effective way, and is it a viable way of doing it in a commercial setting?

The method the researchers have devised to be able to send more data without introducing errors down a fiber-optic strand is called Optical Orthogonal Frequency Division Multiplexing, or OOFDM. The key breakthrough in the technology was the development of a piece of electronics that can encode and decode optical signals on the fly.

So far, the team has been able to reach data speeds of 20 Gb per second, but they believe they can reach speeds as high as 40 Gb per second. The team of researchers is also working with major industry partners, including Fujitsu, the Fraunhofer Heinrich Hertz Institute, Finisar Israel, and VPIsystems.

Source: BBC

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Doesn't matter
By titanmiller on 11/7/2012 11:36:27 AM , Rating: 4
It doesn't matter because nobody is going to run fiber to every home in rural areas. The only wires coming into my house are telephone and electricity, neither of which carry broadband. I'm stuck on 3G wireless for my home broadband.

RE: Doesn't matter
By mackx on 11/7/2012 11:59:19 AM , Rating: 5
yea, but for those of us who don't like in the middle of nowhere this would be sweet!

RE: Doesn't matter
By kattanna on 11/7/2012 1:05:27 PM , Rating: 1
yeah.. but at those speeds talked about.. by the time you have come back from the bathroom you have reached your cap for the month


RE: Doesn't matter
By mackx on 11/7/2012 3:29:46 PM , Rating: 2
i don't have any caps on my broadband. TBs every month for the last few years :D

RE: Doesn't matter
By wifiwolf on 11/7/2012 2:42:24 PM , Rating: 2
And not only that, but we are screwed with broadband here in UK, which can hardly be called broadband. on average 6 Mbit... sigh and highly unreliable.

RE: Doesn't matter
By Argon18 on 11/8/2012 3:21:24 PM , Rating: 2
You choose to live where you do. If high speed internet to your home is so important to you, move. Personally, I'm in the opposite boat. I have 100 Mbit service to my home, but I'm tired of all the city noise and traffic. I would love to buy a house on some land away from everything, where my closest neighbors are miles away. I don't do facebook or twitter or youtube. I'm fine with 56k dial-up. Hey, wanna trade? ;)

RE: Doesn't matter
By Chemical Chris on 11/9/2012 12:52:49 AM , Rating: 2
When electricity and phone first came out, it took many, many decades for the wires to get to essentially every house in rural areas.

ofdm isn't new...
By sixteenornumber on 11/7/2012 11:35:57 AM , Rating: 2
Since when is ofdm new? Next they are going to say they came up with a new technology called ORS - optical reed solomon

RE: ofdm isn't new...
By amanojaku on 11/7/2012 12:31:46 PM , Rating: 2
Exactly. Frequency or wavelength division multiplexing are old concepts. In fact, George Owen Squier created muxing back in 1910.

Most carriers use muxing already at the core for SONET/SDH (40Gbit x 40 or 80 wavelength DWDM), T-carrier (64Kbit x 24, 96, 672, 4032 or 5760 frequency TDM), or (6, 7 or 8MHz x N channels FDM). That means ISPs, telcos and cable television.

And this technology is misnamed. Frequency division multiplexing is for copper cabling, where radio wave frequencies are transmitted. Wavelength division multiplexing is for optical cabling, where light wave wavelengths are transmitted. They're effectively the same thing, but you'd be offending scientists by referring to light frequencies and radio wavelengths. Not DT's fault, since the researchers are the ones who coined the phrase. And they aren't the first, either. This particular implementation of the technology was first introduced as early as 2006.

RE: ofdm isn't new...
By jdietz on 11/7/2012 1:47:12 PM , Rating: 2
Aren't wavelength and frequency two sides of the same coin? I think you're trying to say that people in this industry usually say "wavelength" rather than frequency.

RE: ofdm isn't new...
By Bad-Karma on 11/7/2012 4:10:31 PM , Rating: 2
Aren't wavelength and frequency two sides of the same coin?

Frequency is how often the wave repeats in a given time period.

Wavelength is the duration of the wave or pulse. Or in better terms it is measuring two points of the same phase on a sine wave. ie... by the distance between the 50% point (or zero crossing) of the leading and trailing edges.

If a sinusoidal wave is moving at a fixed speed then wavelength is inversely proportional to frequency. or Pulse Repetition Interval (PRI) over Pulse Repetition Frequency(PRF) --PRI/PRF

But once the wave has been modulated away from a pure sine wave then far more calculations come into play.

However, a far less accurate yet often used "wavelength" is referring to the modulation of several sinusoidal waves together.

If you were talking to an Electronic Signals Intelligence analyst(SIGINT or ELINT) you'd need to be far more precise and use the first reference, else you would certainly get lost in the communication. General "layman" use would work well enough with the second.

RE: ofdm isn't new...
By Solandri on 11/7/2012 4:51:52 PM , Rating: 2
Frequency or wavelength division multiplexing are old concepts.

This is different. In frequency division multiplexing, you just assign one transmission to one frequency. Adam gets 100 MHz, Bob gets 101 MHz, Charlie gets 102 MHz. So each person gets one 1 MHz band.

In orthogonal frequency division multiplexing, multiple transmissions occur simultaneously at the same frequencies. Each individual transmission uses a orthogonal set of frequencies though, so even if transmissions overlap you can back out which transmitted what.

e.g. Adam gets 100 and 101 MHz. Bob gets 101 and 102 MHz. Charlie gets 100 and 102 MHz.

If Adam and Bob transmit a 1 at the same time, you see:
100: 1
101: 2
102: 1

Where as if Bob and Charlie transmit a 1 at the same time, you see:
100: 1
101: 1
102: 2

And if Adam and Charlie transmit at the same time you see:
100: 2
101: 1
102: 1

Based on the signal strengths, the receiver can then figure out who transmitted what. Obviously it gets more complex as you increase the number of simultaneous transmissions and frequency bands, but you get the idea.

The beauty of orthogonal multiplexing is that you don't have to split up your bandwidth into n equal slices for n users. You can over-commit the bandwidth you give to each user. The maximum bandwidth available to each user ends up limited by the noise floor. If all three people are transmitting at the same time, then the noise floor increases, and each person's transmission is limited to 1 MHz of bandwidth (1/3rd of the 3 MHz). OTOH if two of them are transmitting, they effectively get 1.5 MHz each. And if only one of them is transmitting, they get a full 2 MHz (that's a limitation of my simplified example - in more complex coding, the lone transmission would get closer to having all 3 MHz bandwidth to itself).

So whereas in FDM you're limited to your small pre-allocated bandwidth, in OFDM the bandwidth you have available scales automatically depending on how many others are transmitting. Lots of people transmitting and your bandwidth is pretty much the same as FDM. But if fewer people are transmitting, you get more bandwidth. Potentially you could use all the bandwidth available if nobody else is using it.

CDMA does the same thing except using orthogonal codes, which is why it wiped the floor with GSM when it came to data service. (GSM used TDMA, or timeslices instead of frequency slices. It scaled so badly in bandwidth that they had to add CDMA data service to the GSM spec. If you use HSPA+ on AT&T or T-Mobile, you're using wideband CDMA.)

This is for backbones...
By JohnThacker on 11/7/2012 6:37:56 PM , Rating: 2
At least at the moment, this is for backbones. Note all the discussion of current optical fiber and long distances? 10 Gb/s fiber is common, 40 Gb/s and 100 Gb/s are coming, though this may be a different way of handling it.

RE: This is for backbones...
By Milliamp on 11/7/2012 9:08:08 PM , Rating: 2
40G and 100G is already here and backbones have the capability to run multiple 100G channels on fiber up to 5TB or more. Products that do 5TB over hundreds of miles are already on the market.

I don't see the opportunity...
By bupkus on 11/7/2012 1:04:10 PM , Rating: 2
If a pair of ISPs were providing broadband to my neighborhood I could see where my attention to their services and willingness to switch would ultimately result in aggressive competition to the cutting edge of technology.
With only one cable provider to choose from why in the world would Comcast invest against a nonexistent competitor?
Consider too, just as alternate energy attracts investors when the price of oil skyrockets and OPEC periodically drops the price of oil to make alternate energy unviable, an existing ISP would drop prices just long enough to discourage a second cable company and encourage it to go elsewhere.
The ploys would only fail against a determined investor with very deep pockets and one that had secured an exclusive to advanced technology.

OFDM is used in 4G and LTE now
By Milliamp on 11/7/2012 9:04:58 PM , Rating: 2
It is also used in 802.11a/b/g/n etc. This is just implementing it on fiber. 50G over fiber itself is far from new, this just implements a modulation algorithm more commonly seen on platforms that deal with more interference than fiber and applies it to fiber because it does forward error correction (FEC) well.

Current DWDM systems do ~5 terabits over fiber already but the point of this would be to do 40 GigE /PON to the home maybe where plant conditions are less tightly controlled (like with wireless).

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