Re: [802.3BA] Discussion on 40G for => 10 km SMF
> -----Original Message-----
> From: Chris Cole [mailto:chris.cole@xxxxxxxxxxx]
> Sent: Friday, August 08, 2008 6:17 PM
> To: STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
> Subject: Re: [802.3BA] Discussion on 40G for => 10 km SMF
>
> Mikael,
>
> Your proposal for an easy to develop 40GE 8 wave transport
> might benefit from additional technical due diligence.
>
> With 20nm spacing, it is not possible to get 8 wavelengths
> into the 1310nm window; there are only 5 wavelengths
> available. In any case, other then for the 1311nm wavelength,
> all other CWDM wavelengths (in all
> bands) have severely limited reach because of 40G dispersion effects.
To put this into context, a 40G serial solution running in the 1550nm
window is (dispersion) limited to a distance of only 3-4km
(significantly less than even the 10km Mikael is looking for). This
compares to a distance of 80+km at 10G .
Bottom line is that 40GE colored optics will require something other
than a simple serial solution (as Chris pointed out in an earlier
email).
Gary ....
>
> Chris
>
> -----Original Message-----
> From: Mikael Abrahamsson [mailto:swmike@xxxxxxxxx]
> Sent: Friday, August 08, 2008 2:55 PM
> To: Chris Cole
> Cc: STDS-802-3-HSSG@xxxxxxxxxxxxxxxxx
> Subject: Re: [802.3BA] Discussion on 40G for => 10 km SMF
>
> On Fri, 8 Aug 2008, Chris Cole wrote:
>
> > There is nothing about any approach being considered for
> 40GE 10km SMF
> > that helps DWDM better then the other being considered.
>
> I am not primarily talking about DWDM, I am talking about
> 10km (and perhaps up to 40km) SMF light with CWDM wave
> spacing (20nm) for metro applications.
>
> Enabling fairly easy development of 40GE 8 wave transport
> without transponders (colored optics directly into external
> CWDM mux) tips the balance for me in favor of 40GE serial, if
> cost projections are similar for 40GE serial vs 4x10GE CWDM.
>
> --
> Mikael Abrahamsson email: swmike@xxxxxxxxx
>