On Mar 18, 2013, at 11:18 AM, David Landry wrote: > On Mon, Mar 18, 2013 at 10:15 AM, Steve Alligood <[email protected]>wrote: > >> naw, you can get 32+ colors on a pair of single mode fiber, it just isn't >> cheap and has problems with different colors at different distances. >> > > Maybe you can, but a single mode waveguide is designed to allow propagation > of a single mode at a particular wavelength. That wavelength of that mode > can be adjusted by changing core diameter and the index of refraction > profile [0]. > > I suppose you could couple other wavelengths into an evanescent mode along > the cladding over a short enough distance, though. Are you referring to > some particular product?
no, most dwdm and cwdm systems work with multiple colors across SMF. I have a set of Cienna chassis with four colors each from Provo to SLC across a pair of SMF, and a passive WDM system (optics on their own colors, with a shelf that is basically just a prism combining them) that goes the same distance across a pair of SMF. As far as I know, SMF is the norm for most of my vendor's waves they sell us across the country. MMF just doesn't make sense for the distances. I am not an expert on how they combine, or the issues they have amplifying the different colors, etc. BTW, anyone wanting to know more about fiber, read this: http://www.nanog.org/meetings/nanog48/presentations/Sunday/RAS_opticalnet_N48.pdf
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