[c-nsp] [External] Re: Support for CFP2

[Hunter Fuller]

I know when we are talking about DWDM my usual expectation these days
is to use a "0km optic" (aka one that is meant to launch just far
enough to make it into an amp)... so one of those (from anyone, e.g.
fs.com, whatever) followed by an amp might be doable? I would advise
you to contract someone to work that out though (I myself don't even
fully understand the intricacies).

the point of the 0km optic is that it fits in QSFP+ generally. It's a
lot to ask, to get a precisely tuned DWDM wave coming out of a lil
QSFP+ at ZR levels.

The other option of course being to send it LR and then use a
transponder closer to the DWDM gear, as Nick suggested.

-- 
Hunter Fuller (they)
Router Jockey
VBH M-1C
+1 256 824 5331

Office of Information Technology
The University of Alabama in Huntsville
Network Engineering

On Fri, Jan 19, 2024 at 9:07 AM Nick Hilliard via cisco-nsp
<cisco-nsp at puck.nether.net> wrote:
>
> Shawn L via cisco-nsp wrote on 19/01/2024 14:58:
> > The pluggable optic must be DWDM 1530 to 1563 nm with QPSK modulation that
> > fits 50Ghz (~31 to 35Gbaud) and a launch power of ZR+ 0dBm. The customer
> > channel should have Rx: Max <-10 dBm/Ch and Tx: Min: >–5 dBm/Ch to Max: <+
> > 6.5dBm/Ch in order to meet the GOSNR margin of 2.5dBm or more.
>
> right, so DWDM alien wave requirement then. That's very non-portable and
> kit specific.
>
> Depending on the application, you might be better off ditching the
> requirements that they're imposing and simply using 100G transponders
> (i.e. 100G as a service).  Or something like the smartoptics open line
> system with PAM4 QSFP28 transceivers.
>
> It really depends on what's between you and the other end.  D/F has
> simple options open for single 100G. If you're connecting into something
> more complicated, it can get messy and expensive.
>
> Nick
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