Re: 100GbE beyond 40km

[Randy Carpenter <rcarpen () network1 net>]

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

thanks, 
-Randy 

----- On Sep 27, 2021, at 10:25 AM, Dan Murphy <dmurphy () pilotfiber com> wrote: 

> > Are you saying we could use normal QSFP28 LR4 or ER4 modules with an amplifier
> > in between?
> Yes, that is the idea from 30,000 ft. Fun fact, the ER4 optics you mention are
> amplified inside the pluggable in a very similar manner to how these EDFA
> systems work.

> Basically: QSFP28 100G ER <-> EDFA Amp <-> OSP/dark fiber <-> EDFA Amp <->
> QSFP28 100G ER
> Very simple, and from the Juniper gear's POV, there is no funny business. All
> the magic happens down at layer 0.

> The systems are commoditized and pretty easy to find. I saw a few people on this
> thread mention Solid Optics, personally I have not heard of them, but I would
> trust LB's recommendation. I've used systems by other manufacturers in the past
> and wasn't crazy about them. I don't want to flame that manufacturer since they
> read this mailer, and who knows, the issues I saw might have been isolated to
> manufacturing issues, but I still wouldn't recommend them.

> The learning curve is pretty low, and the manufacturers of this gear are
> ~usually~ very eager to guide basic implementation. However, ping me off list,
> or on here, if you have any deeper questions about this.

> Have a good week everyone!

> On Sun, Sep 26, 2021 at 12:17 AM Lady Benjamin Cannon < [ mailto:lb () 6by7 net |
> lb () 6by7 net ] > wrote:

> > My guess is that he was talking about the difference between a 100gbit/sec
> > stream of ethernet frames with no error correction, and a 112gbit/sec (or so,
> > depending on scheme) stream of transport with FEC (Forward Error Correction -
> > which is essentially just cramming extra bits in there incase they are needed.

> > Ethernet has to re-transmit instead, and that can cause performance degradation
> > and jitter, until it just quits working altogether. Systems implementing FEC
> > are much

> > (This is a guess, there’s a chance something else was meant by this)

> > -LB.

> > > On Sep 25, 2021, at 1:55 AM, Etienne-Victor Depasquale via NANOG < [
> > > mailto:nanog () nanog org | nanog () nanog org ] > wrote:

> > > Bear with my ignorance, I'm genuinely surprised at this:

> > > > Does this have to be Ethernet? You could look into line gear with coherent
> > > > optics.

> > > Specifically, do you mean something like: "does this have to be
> > > IEEE-standardized all the way down to L1 optics?" Because you can transmit
> > > Ethernet frames over line gear with coherent optics, right ?

> > > Please don't flame me, I'm just ignorant and willing to learn.

> > > Cheers,

> > > Etienne

> > > On Fri, Sep 24, 2021 at 11:25 PM Bill Blackford < [ mailto:bblackford () gmail com
> > > | bblackford () gmail com ] > wrote:

> > > > Does this have to be Ethernet? You could look into line gear with coherent
> > > > optics. IIRC, they have built-in chromatic dispersion compensation, and
> > > > depending on the card, would include amplification.

> > > > On Fri, Sep 24, 2021 at 1:40 PM Randy Carpenter < [ mailto:rcarpen () network1 net
> > > > | 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

> > > > --
> > > > Bill Blackford

> > > > Logged into reality and abusing my sudo privileges.....

> > > --
> > > Ing. Etienne-Victor Depasquale
> > > Assistant Lecturer
> > > Department of Communications & Computer Engineering
> > > Faculty of Information & Communication Technology
> > > University of Malta
> > > Web. [ https://www.um.edu.mt/profile/etiennedepasquale |
> > > https://www.um.edu.mt/profile/etiennedepasquale ]

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