Re: 100GbE beyond 40km

[Dan Murphy <dmurphy () pilotfiber com>]

> Looking at EDFA options... they are all ~1500nm as far as I can tell. Is
there a specific model you are talking about?

Yeah, that is a consequence of how the EDFA technology works. It really
only works in the C-band and sometimes the L-band, depending on how it's
manufactured. If you contact one of the manufacturers on this list they
should be able to help you with solutions engineering.
You would essentially be looking at a 10x 10G LAG *or* a single 100G
channelized optic (which are a thing, just pay attention to how they
achieve that, and that it runs at 100GHz)

There are other amplifier systems, like the one Brandon mentioned, which
operates via another mechanism. Personally, I would recommend the EDFA
system for two reasons, it's more commoditized, and depending on the model
you purchase, you will have some. spare DWDM channels. You might not need
it today, but man is it nice to have that extra capacity sitting there.

If you do go for a super extended range optic (like what Brandon
mentioned), make sure the pluggable power draw is within range of your
gear. No point in burning out an expensive optic and your gear.

I could go on about chromatic dispersion for days, I think that is so
interesting, but a little outside the scope of this chain. Whatever
manufacturer you engage with will help with that. Thankfully this tech has
gotten to the point where we can just slap that module in and not worry
about what is actually going on behind the scenes.

- Dan

On Mon, Sep 27, 2021 at 3:43 PM Pierre LANCASTRE <pierre.lancastre () gmail com>
wrote:

> Hi
>
> +1 for SmartOptics products. Got M-1601 + optics, did the job very well
>
> Pierre
>
> Le lun. 27 sept. 2021 à 20:52, Kevin Menzel via NANOG <nanog () nanog org> a
> écrit :
>
> > We’ve had DCP-M boxes in service for a few years now on our +40km links,
> > with their PAM4 100Gb optics. It’s been SO easy.
> >
> > If I had the money, we’d throw DCP-M boxes at every link we have.
> >
> >
> >
> > -Kevin Menzel
> >
> >
> >
> > *From:* NANOG <nanog-bounces+kevin.menzel=sheridancollege.ca () nanog org> *On
> > Behalf Of *Joe Freeman
> > *Sent:* September 24, 2021 17:07
> > *To:* Randy Carpenter <rcarpen () network1 net>
> > *Cc:* nanog <nanog () nanog org>
> > *Subject:* Re: 100GbE beyond 40km
> >
> >
> >
> > This message was sent from outside of Sheridan College. Please be careful
> > when opening attachments, clicking links, or responding to requests for
> > information.
> >
> >
> >
> > Open Line Systems can get you to 80K with a 100G DWDM Optic (PAM4) -
> >
> >
> >
> > I've used a lot of SmartOptics DCP-M40 shelves for this purpose. They
> > also have transponders that allow you to go from a QSFP28 to CFP to do
> > coherent 100G out to 120Km using the DCP-M40, without a need for regen or
> > extra amps in line.
> >
> >
> >
> > The DCP-M40 is a 1RU box. It looks like a deep 40ch DWDM filter but
> > includes a VAO, EDFA amp, and a WSS I think.
> >
> >
> >
> > On Fri, Sep 24, 2021 at 4:40 PM Randy Carpenter <rcarpen () network1 net>
> > wrote:
> >
> >
> > How is everyone accomplishing 100GbE at farther than 40km distances?
> >
> > Juniper is saying it can't be done with anything they offer, except for a
> > single CFP-based line card that is EOL.
> >
> > There are QSFP "ZR" modules from third parties, but I am hesitant to try
> > those without there being an equivalent official part.
> >
> >
> > The application is an ISP upgrading from Nx10G, where one of their fiber
> > paths is ~35km and the other is ~60km.
> >
> >
> >
> > thanks,
> > -Randy

-- 
Daniel Murphy
Senior Data Center Engineer
(646) 698-8018