DWDM and EDFA and DCM

[swmike at swm.pp.se (Mikael Abrahamsson)]

On Wed, 22 Apr 2015, Rodrigo Augusto wrote:

> Does anyone have some experience to use dwdm monofiber mux/demux ( ex.
> fiberstore ) about 68km using a ADFA ? Have I to use a DCM( for chromatic
> dispersion ) on this distance? When I have to use a DCM ?

You have to use DCM when the chromatic dispersion caused by your distance 
exceeds what your receiver optical module can handle.

So the answer is "it depends". If you're using 1GBASE-DWDM optics then 
you'll be fine, if you use 10GBASE DWDM optics then it depends on the 
distance they were designed to handle, if you buy the 40km ones then you 
should have DCM.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se