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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 with either silicon or Indium Phosphide. Given the increas ...

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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 recent blog article, it is clear that in general, development of silicon photonics for active components has for several decades been akin to placing a square p ...

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Absurdity of Stressing Metro 100G Now

January, 2015

A couple of financial analysts have been touting Ciena as the expected big winner for a future contract for a large 100G metro project at Verizon. While there can be little doubt that the vendor would be part of such a deal, it needs to always be remembered that these announced agreements never compel the service provider to buy one dime from any supplier, and so the actual amount of equipment purchased could be far less than initially indicated. Moreover, the conspicuous absence in the current discussion of Fujitsu, a vitally important metro incumbent vendor to Verizon, strongly points to the service provider buying less than a stellar amount of this gear anytime soon. Above all, current expectations for growth in the total 100G market are nothing to write home about – one market research firm, usually among the bullish crowd in general, is only projecting about a 25% increase in terms ...

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Surviving in a 10G World

February, 2015

Given that the lion’s share of the discussion in telecom forums is about vaporware, it is not surprising that a lot people in the industry would probably be amazed to hear that R&D spending on 10G devices is still happening. While the really compelling drama within suppliers is occurring with mature or even declining market situations, including on 1G and on VCSELs, in which substantial revenue is on the line, the obsession on analyzing the accounts of the various futuristic, sexier solutions can sound repetitive, and at the end of the day, they have a tendency to be quite boring. In contrast, the struggle for 10G transport equipment vendors to survive is a captivating narrative involving a data rate, which will remain a mainstay in public and enterprise networks for a very long time -- in which there is still an overabundance of participants (partially because financing going back to th ...

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