[NANOG] DWDM More Details

Alex Pilosov alex at pilosoft.com
Fri Apr 25 12:58:09 CDT 2008


On Fri, 25 Apr 2008, John Lee wrote:

> In your talk, I agree that the CAN with your CWDM is not that expensive
> but you also mention that the tighter DWDM with long haul optics is
> expensive ie "Everybody knows how to do (active) xWDM by giving a lot of
> money to (insert vendor of choice]:"
> 
> When you talk about the tighter itu spacing for "real" DWDM and the
> lasers with fiber that can handle the power, jitter, chromatic
> dispersion et al. the optics you mention will not handle that.
> 
> We have all duct taped optical systems on campus for the lab "and across
> the state of Georgia" see the Peach Net map.
> 
> What is the largest number of lambdas you have actually run on a single
> fiber with your duct tape system and how bad was the optical cross talk?
I'd be curious to ask reverse question, did anyone *have* real problems
deploying duct tape systems, or power jitter chromatic dispersion is
vendor mumbo jumbo designed to make you buy their gear?

(within the distance limits spec'd, 80km dwdm etc)

-alex





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