[TriLUG] The next Arpanet? 10 Billion bits per second?
kjohnson at northcarolina.edu
Thu Mar 4 12:52:12 EST 2004
At 09:25 PM 3/3/2004 -0500, you wrote:
>crimsun at fungus.sh.nu wrote:
>>On Wed, Mar 03, 2004 at 04:42:39PM -0500, Joshua Gitlin wrote:
>>>Just saw this in the News and Observer. [
>>>http://newsobserver.com/business/story/3385140p-3011134c.html ]. Thought
>>>it might interest some people here. I'd love to learn more about it. I
>>>can't tell if it's IP based, or what. Sounds cool though!
>>Take a look at http://www.nationallambdarail.org/architecture.html
>If you read the fine print at this link, you may come to the realization
>that I have: It's not 10Gb, it's 400Gb. They're using DWDM (Dense
>Wavelength Division Multiplexing) - which from my fiber experience (many
>years ago) sounds like the big brother to multi-mode fiber. With the
>obvious differences being it works over distances previously only possible
>via single-mode fiber (i.e. only one beam of light down one tube of
>glass), and it's a heckuva' lot more transmission paths (beams of light
>down one tube of glass).
WDM and DWDM both use single mode fiber. The modes in MM fiber are there
only because of the multiple injection angles of a single wavelength light
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