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Re: [Semi-OT] Public FiberOptic Network (Manufacturers)

On Thu, 02 Apr 2009, Michelle Konzack wrote:
> > You can do with a lot less fiber when using DWDM, but DWDM that you
> > can count on to keep your backbone working with a decent number of
> > nines is _very_ expensive.  It is good for long hauls (like inter-city
> > ones), though.
> I have already read a bunch of this technology, but it is very  new  and
> currently I do not know...

No, DWDM is not new.  It is proven tech, but it is expensive, and usually
you do _not_ talk DWDM in switches, etc.  You use the DWDM equipment in the
middle of the path, like multiplexers and demultiplexers, and also as taps
in the street.

It is VERY nice if you have just one pair of fiber from city A to city B
(maybe under water, or inside the power grid cables), and you'd like to
have, say, 4, 8, or even 80 pairs instead :-)  It does wavelength-based
multiplexing, so each channel has a huge ammount of bandwidth, depending
only on how the DWDM multiplexers/demultiplexers are built.  It is also much
easier to laser-pump, etc.

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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