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IJD 12/5/2012 | 5:05:59 PM
re: Infinera Races the Clock on 100G

Agreed 100% about what really matters -- I was only talking about 40G/100G coherent receivers for long-haul, for other applications simpler solutions may indeed be more appropriate right now.


But I'm pretty sure that Infinera's PIC solution is *not* single-carrier DP-QPSK, their own material (which Craig referred to) says that it's dual carrier like Nortel/Ciena -- though this technical information is very well hidden, and somewhat contradicted by the often-repeated "500G PIC=5*100G" marketing claims.


As far as I know, the only single-carrier 100G coherent system in the field right now is the Alcatel-Lucent one announced last year. Others on the way presumably include the Fujitsu one announced this week, since it uses their 65Gs/s ADCs:


http://www.lightwaveonline.com...

Mark Sebastyn 12/5/2012 | 5:05:56 PM
re: Infinera Races the Clock on 100G

Deployed fiber infrastructure is the best generic term, I like that. The Chinese guys don't even use Metro WDM in some areas because the "deployed fiber infrastructure" doesn't require it.

furious_george 12/5/2012 | 5:05:56 PM
re: Infinera Races the Clock on 100G

Andrew,


I would modify your what really matters at the end to state something like:


"The only thing that matters is $ per bit per km per Hz. How much does it cost to send a quantity of bits (typically 100G or 10G) a given distance over the deployed fiber infrastructure a certain amount of optical spectrum."


The deployed fiber infrastructure captures the fiber differences, xOADM differences, channel mangement philosophy, amplifier differences plus the need for spectral efficiency.


I agree with most of what you commented with the exception that I have also heard that INFN is dual carrier. &nbsp;Note that for the PIC this might be the right approach even though it is not optimized for the OIF based ecosystem which supports more traditional optics packaging &amp; partitioning. &nbsp;I'm of the opinion that INFN will be on the losing end of this transition, but then I didn't believe that they would do so well at 10G.&nbsp;


Furious_George


&nbsp;

sigint 12/5/2012 | 5:05:55 PM
re: Infinera Races the Clock on 100G

Craig:CEO Tom Fallon made an interesting point about 40G at the end of the earnings call. A lot of the 40G opportunity is in China and therefore closed to Infinera (he didn't specify why, but obviously it's because of Huawei and maybe ZTE).


__________________________________________________________________________


Could it have something to do with US export restrictions?


IJD 12/5/2012 | 5:05:55 PM
re: Infinera Races the Clock on 100G

I agree with George that dual-carrier could be a good (or less bad?) way to go with a PIC, compared to non-PIC where the big advantage of single-carrier is that you only need one set of optics (including laser and MZM); these do have to be 25Gb/s (which is a lot more difficult) but I expect will eventually be cheaper/simpler/smaller than two separate sets of 12.5Gb/s optics.


If you can put everything inside a single PIC then the picture changes somewhat, you still need twice as many components inside the PIC as for single-carrier but the marginal cost of this is presumably less with a PIC, and design is easier because the bit rate is halved.


Whether this leads to lower overall cost is debateable -- and to be blunt, the reason people do 100G dual-carrier is usually because they haven't got or can't do single-carrier yet (or want to use legacy components developed for 40G) rather than any real technical/cost advantage, this is why Nortel/Ciena went this way.


I'd still like to know how Infinera propose to get 10 x 50G ADC/DSP chips close enough to their 500G PIC to avoid losses in PCB/connectors, while not ending up with a huge power density by having 500G total in a very small area -- if a single OIF 100G module has 80W power budget then the equivalent of 5 of these (or 10 x 50G, total DSP processing power needed is the same) could be up to 400W...

Pete Baldwin 12/5/2012 | 5:05:53 PM
re: Infinera Races the Clock on 100G

&gt; Could it have something to do with US export restrictions?

Actually, I wasn't thinking along those lines. I throught he was talking about in-country favoritism -- Chinese carriers tending to work with the Chinese vendors.



I do like Seven's point that the same arguments could be made for 100G.


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