Intel Details Thunderbolt Spec: New Chips Coming Next Year, But What About Fiber Optic Cables?

This is my next reports on an Intel presentation at IDF yesterday detailing specifications for the Thunderbolt connectivity standard, demonstrating the company's commitment to the platform. The presentation reveals a long list of details on the standard, including the use of a Mini DisplayPort-compatible plug as found on Apple's Thunderbolt-enabled Mac models, officially disapproving of Sony's plans to utilize USB as the connector for Thunderbolt.

idf thunderbolt spec
The report notes that Thunderbolt cable lengths are currently limited to three meters due to their reliance on electrical connections. Thunderbolt, which began under the codename "Light Peak", was originally intended to offer fiber optic cables, but Intel is continuing to work on that technology to bring it to consumers. The company is apparently planning to make fiber optic Thunderbolt cables available beginning next year, but they will run at the same speeds as with the current copper wire cables.

What about active optical Thunderbolt cables? Intel says that they will be released “sometime next year” and enable lengths of “tens of meters.” Unfortunately, the first round of active optical cables will operate at the exact same speed as current cables, 10Gbps. Intel says that is necessary because it wants those cables to conform to the current spec, but that faster speeds are certainly possible into the further future. All cables have two channels and can work as a Displayport cable (but not, obviously, vice versa).

IDG News takes an opposing view based on an interview with Intel executive Dadi Perlmutter, seeing optical cables as still being years away from being competitive with the copper cables.

The trend of using copper wires could continue, and it could be many years before fiber optics are used in Thunderbolt.

"It's going to be way out," Perlmutter said. "At the end of the day it's all about how much speed people need versus how much they would be willing to pay."

The cost of implementing fiber optics is significantly higher than copper, and copper can transfer data at adequate speeds at this stage, Perlmutter said. There is still more room for data transfers to jump on copper.

"Copper will continue to improve, which happens. There have been many technologies that had been predicted dead 20 years ago that are still making good progress. We'll see," Perlmutter said.

Meanwhile, Intel continues to advance the technology used in its controller chips for Thunderbolt, planning for the successors to its four-channel Light Ridge chip used in the MacBook Pro, Mac mini, and iMac and its scaled-down two-channel Eagle Ridge chip used in the MacBook Air. According to AnandTech, Intel's 2012 Thunderbolt chip is known as Cactus Ridge, and will also be offered in four-channel and two-channel versions. No details on pricing or other improvements have yet been disclosed, but the Intel is said to be planning to offer Cactus Ridge in packages measuring in as 12 mm by 12 mm.

Top Rated Comments

BornAgainMac Avatar
120 months ago
I want to see Wireless Thunderbolt. I see it in nature all the time.
Score: 5 Votes (Like | Disagree)
cult hero Avatar
120 months ago
Thank goodness they're ditching USB-style connections...

USB has got to be the worst design for a connector ever as far as the shape. There's no easy way to see which way the thing should be inserted. I don't even care if it's Apple's standard that's adopted so long as it's a standard where I can simply look and see which way the cable should be inserted.

(Oh, and Firewire 800 also deserves similar mention as a poorly designed connection type.)
Score: 5 Votes (Like | Disagree)
Consultant Avatar
120 months ago
There's no need to have fiber at the same as copper, when copper can provide power.
Score: 4 Votes (Like | Disagree)
nemanjaj Avatar
120 months ago


This presents a problem if you're trying to attach a hard drive or some other future device, and from what I read a display has to be last in the chain, so you need to plug it thru an external drive case if you have one...


Display has to be last in the chain only in the case it is not a thunderbolt compatible display. Otherwise - you can daisy chain devices behind your display.

For this reason - I really do like the fact it is combined together with the display cable, because now display can be a docking station for a laptop.
Score: 3 Votes (Like | Disagree)
sporadicMotion Avatar
120 months ago

Not so facetious as you might think. I worked at a CompUSA when the original iMac was released. Windows PCs had had USB ports for a few years at that point (since early in the Win95 cycle), and Windows (as bought on a PC) had basic USB support since Win95 OSR3, OSR3.1 and OSR3.5. It was the release of the iMac that brought USB devices into the mainstream. About 90% of the USB devices came in 'bondi blue and/or frosted white' color schemes. (Including a number of printers!)

Believe, me I remember the complaints from the beige-box crowd about the color scheme on so many mice and joysticks. This was, of course, back before the 'everything has to be black!' craze hit the PC side of the market, when an internal CD-ROM drive with a black faceplate cost $5-15 more than the identical beige faceplate version.


How do you figure the iMac brought anything to the mainstream at that point in time? The market was 99.9% pc at that point. PC users made USB mainstream, the iMac just brought it to mac users.
Score: 2 Votes (Like | Disagree)
coder12 Avatar
120 months ago

"But What About Fiber Optic Cables?"


I dunno, MacRumors, what about fiber optic cables?
Score: 2 Votes (Like | Disagree)

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