D'oh, need to re-read what I send before I send it. On Mon, Mar 18, 2013 at 12:24 PM, David Landry <[email protected]> wrote:
> On Mon, Mar 18, 2013 at 11:50 AM, Steve Alligood <[email protected]>wrote: > >> >> 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. >> > Thanks for clarifying. Thinking about it some more, I realized I misspoke. > Keeping other things constant, you should be able to transmit wavelengths > at least up to the V < 2.4 cutoff (above that, you might still be able to > transmit, but it would definitely not be *multi-mode* anymore). I suppose > the hard cutoffs are material-based. > I meant "single-mode". > BTW, anyone wanting to know more about fiber, read this: >> >> >> http://www.nanog.org/meetings/nanog48/presentations/Sunday/RAS_opticalnet_N48.pdf > > > +1 > > Nice set of slides, though I cringed a little where he said that > "intensity" and "power" were the same; intensity has units of power per > area (e.g. W/m^2). > --- > David Landry > /* PLUG: http://plug.org, #utah on irc.freenode.net Unsubscribe: http://plug.org/mailman/options/plug Don't fear the penguin. */
