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Big Need for MPLS-TP?

August, 2014

At the service providers across the globe, the most widespread and native selection is MPLS and not MPLS-TP. The former has broader acceptance, superior interoperability, and operational intimacy for the engineering folks. In Asia, particularly China, MPLS-TP has taken off in a big way. While some industry observers view that part of the world as exceptionally unpredictable and may suggest that “TP” could even be replaced, it seems that at least one of the large Chinese operators has such a critical mass of deployment that such a move is not imaginable. On its face, one would think customers should want to go with MPLS-TP over MPLS because the former is a newer version. Ordinarily, any supplier that would happen to start product development from scratch would definitely be inclined to begin in the “TP” direction. Theoretically,...

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25G Laser Shortage

August, 2014

We have been told that there is going to be a worldwide shortage of 25G lasers in the coming two years, supposedly due to not enough capacity having been planned by the industry as a whole.  We hadn’t heard anything like this before.  Do you guys know if this is true, and if so, why it happened? A couple of our contacts indicate that supply is down because of unexpected demand by a few data center operators as well as a greater need for customized optics, and that 25G lasers have inherently lower manufacturing yields than is the case, say with 10G devices. Specifically, the 25G DMLs are in short supply, not the EML devices. However, the EMLs are very expensive, especially for short-distance applications. There is also apprehension that expanding production will create a long-term overcapacity situation, once the market gets...

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The Guts of the CFP2

August, 2014

For the next generation of 100G coherent line interface form factor CFP2, will it be a split implementation -- analog CFP2 and separate digital DSP ASIC for the card? Can both parts be integrated into the single package? As far as we know, it will be split. While today, there is one 100G on a card, etc., with CFP2, there will be at least two on a board. There is no question that it would be desirable to use the same DSP for both. However, the industry has gone back to the 1990s in which 100G customers, such as Alcatel-Lucent, Cisco Systems, etc., each have their own DSP, and they believe that to be their secret sauce -- and that is why the DSP is coming out of separate packages. (written by: Alka Swanson)

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Silicon Photonics: Widespread Usage on Active Components Doubtful

September, 2014

While the amount of industry chatter about silicon photonics rose substantially in 2014, partially because of certain market research firms looking to sell more reports, the technological hurdles, especially with insertion loss, make extensive use of active, combined components, such as for modulators and photodetectors, unlikely in the foreseeable future. Although there have definitely been numerous demonstrations of integrating with these CMOS fabrication processes, like with receivers, both the performance and cost are superior with standard methods. Certainly for passive devices, silicon lends itself quite well to integration, including for AWGs. Instead of using micro optics, combining waveguides with attenuators is being accomplished with Si. With 100G receivers, the delay lines are being integrated with the phase combiners...

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Finisar Getting a Raw Deal with Silicon Photonics

September, 2014

When it comes to technology development, some of the leading analysts in the financial community have a tendency to blindly follow a template of conventional wisdom. One of the most egregious examples was during the bubble when there was the widespread notion that the need for bandwidth could not be satiated, and service providers were literally being punished for installing insufficient dark fiber. A similar injustice has occurred with Finisar with the imagined threat to the company by the introduction of silicon photonics. These investment firms talk about the “checks” they conduct in drawing their conclusions. Well, how about spending approximately five minutes checking with an objective optical scientist? As we suggested in a

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