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Optical/IP

Luxcore to Demo Optical Switch Advance

Luxcore Networks Inc. is planning to demonstrate a significant development in all-optical switches at the Optical Fiber Communications (OFC) Conference in Anaheim, Calif., next week.

The startup will show a working prototype switch incorporating optical rather than electrical wavelength conversion -- a development that could help carriers slash costs considerably.

Understanding this can be a little tricky, but the argument goes like this:

First-generation, all-optical switches are fairly limited in what they can do. In their simplest form, they act like automated patch-panels, steering all the light from one fiber into another.

In their more sophisticated form, they're integrated with DWDM (dense wavelength-division multiplexing) systems so that light is split into different wavelengths before it’s switched. In this case, the wavelengths coming out of one fiber can be routed into different fibers.

The big catch, however, is that the switch can’t change the wavelength of the light without converting it into electrical signals and retransmitting it -- and this OEO malarkey is exactly what all-optical switches are supposed to eliminate.

Optical wavelength conversion promises to avoid this snag, but that’s only for starters.

Being able to shift light from one wavelength to another can be used to sidestep problems associated with one stream of signals blocking the path of another stream within a switch, according to Gerald Ramdeen, Luxcore’s CEO and CTO. As a result, the same capacity switch needs significantly less switching fabric if optical wavelength conversion is employed, he says. That equates to "less power, less space, less cost -- and that's exactly what customers want."

Luxcore’s way of doing optical wavelength conversion also appears to give its switch another plus. Light signals get a boost of power as they pass through. Ramdeen is cagey about giving details. “We’re using tunable lasers as a programmable pump source,” he says, adding, “We’re doing frequency mixing without all the nasty side effects.”

Our reading of this is that Luxcore’s using semiconductor optical amplifiers (SOAs). The tunable laser pumps different wavelengths of light into the SOA to change the wavelength of the light carrying the actual data.

Now for some details. Luxcore’s switch, called the LambdaXchange, will come in two sizes. The first one will have eight input fibers and eight output fibers and a capacity of 20 terabit/s. The second one will have 16 input fibers and 16 output fibers and a capacity of 120 terabit/s. Both models will incorporate some state-of-the-art DWDM technology: 240 channels, 80 in the C band, 80 in the L band, and 80 in the S band.

The switch is formed from two subsystems. The first one incorporates wavelength multiplexers and wavelength converters, which also amplify light signals, as already noted. This subsystem also incorporates some unspecified components that reshape signals optically.

The first subsystem marshals the different streams of light from the carrier’s fiber infrastructure and feeds them into the second subsystem, the switching fabric. Right now, Luxcore is using MEMS (micro-electro-mechanical system) switching fabric, although Ramdeen points out that his switch “wasn’t engineered around MEMs." It would be straightforward to replace the subsystem with something else, if it seemed appropriate.

Luxcore’s demo at OFC will be of a smaller switch, with just two input and two output fibers. It will support 40 wavelengths per fiber. The startup plans to demonstrate wavelength routing, optical wavelength conversion, add-drop functions, and broadcast functions, according to Ramdeen. “We hope this is going to be the first example of optical wavelength conversion,” he says. “We’ll know on Monday whether it really is."

Luxcore expects to start shipping commercial versions of its switch in the fourth quarter of this year. It has 125 staff. It raised $10 million in series A financing last July (see Luxcore Raises $10m First Round) and is planning to start raising further funding soon. “We purposely delayed our next round until after OFC,” says Ramdeen. Originally, Luxcore was called Synchordia (see Startup Touts "First Optical Router").

-- Peter Heywood, international editor, Light Reading http://www.lightreading.com
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fanfare 12/4/2012 | 8:42:59 PM
re: Luxcore to Demo Optical Switch Advance Yes .. thats right ..oeo switch = grooming. But (and I know I didn't phrase my question well) I'm wondering about the need for electical conversion in order to change the wavelength.

iprsvp 12/4/2012 | 8:42:59 PM
re: Luxcore to Demo Optical Switch Advance Most probably CORV is working on a OEO grooming
switch. So it does makes sense to have OOO and
and a OEO grooming switch.
Belzebutt 12/4/2012 | 8:42:58 PM
re: Luxcore to Demo Optical Switch Advance I'm surprised that you said Corvis still uses OEO for wavelength switching, because this page seems to imply that they do it all optically:

http://www.corvis.com/solution...

"Corvis offers the only carrier class long distance network solution that utilizes an all-optical switch. The Optical Switch switches wavelengths directly through the optical layer, eliminating the intervening electronic layer, while providing 2.4 Tb/s of switching capacity. "

Also this:

http://www.corvis.com/products...

"3 GĒō 6 port configurations with up to 800 Gb/s per port"

Only 6 ports vs. 1000 ports for the OPTera? That says to me Corvis must do wavelength translation because then they can get away with much fewer ports. If the OPTera has 2000 ports, it's probably because they need to put each lambda on a different port to switch them. Also Corvis claims to support 240 lambdas, a 6-port switch would be useless if they had to separate them.

Also this:

"Optical transparency enables intelligent end-to-end wavelength planning and provisioning."

This is kind of neat:

http://www.corvis.com/products...

"6 ports, 160 each per channel"
fanfare 12/4/2012 | 8:42:58 PM
re: Luxcore to Demo Optical Switch Advance "and this OEO malarkey is exactly what all-optical switches are supposed to eliminate."

What are they saying here? Are they implying that CORV's all optical solution does not eliminate the need for oeo in order to convert wavelengths? "Suppose to eliminate" .. see what I mean?
optical illusion 12/4/2012 | 8:42:57 PM
re: Luxcore to Demo Optical Switch Advance That's fiber going into that port, not a line card for a single OC 192 or OC 48 channel.

The corvis switch is an OXC that handles six fiber pair, each on a SONET ring or point to point config.

The switch routes waves among the six fibers, OPTICALLY.


Belzebutt 12/4/2012 | 8:42:56 PM
re: Luxcore to Demo Optical Switch Advance "The switch routes waves among the six fibers, OPTICALLY."

Yes, the question is, does it also do lambda translation or not.
optical illusion 12/4/2012 | 8:42:54 PM
re: Luxcore to Demo Optical Switch Advance
That's a
optical illusion 12/4/2012 | 8:42:54 PM
re: Luxcore to Demo Optical Switch Advance
That's a
optical illusion 12/4/2012 | 8:42:53 PM
re: Luxcore to Demo Optical Switch Advance

As I was saying, that's a Village Networks thing.
fanfare 12/4/2012 | 8:42:52 PM
re: Luxcore to Demo Optical Switch Advance yes .. that IS indeed the question.

Anyone have an answer for that?
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