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

[Shawn L]

Thanks - we don't really understand the intricacies either.  This is our
first adventure in this area.

The distances are quite large (800+ Km).  It's a dark wave service, though
we don't have to worry about anything in the middle, just the 2 end points.

I'm told Adva / Adtran will be releasing a ZR+ 0dBm QSFP28 that would (or
should) work in Q2 2024, but I'm looking for other options.  I did check
out FS.com, but they're telling me the only option they have available uses
a 200Gig CFP2 and 2 100gig QSFP28s.

Any idea where else we might look?  We'd be happy to engage someone to help
us design a solution, we're just not sure where to turn.

Shawn

On Fri, Jan 19, 2024 at 1:25 PM Hunter Fuller <hf0002 at uah.edu> wrote:

> 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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