Re: 100G over 100 km of dark fiber

[Jared Brown <nanog-isp () mail com>]

The 100 km leg completes a ring.
 

Jared
 

Sent: Friday, October 30, 2020
From: "Ben Cannon" <ben () 6by7 net>
To: "Jared Brown" <nanog-isp () mail com>
Cc: nanog () nanog org
Subject: Re: 100G over 100 km of dark fiber

You could break this into 10x 10g coherent lanes, but you’re going to end up back close to coherent 100g prices.
 
You’re at the threshold distance where you’re past all the short range tech and are seriously pushing it - whereas the 
100g coherent tech is just taking off.  
 
How important is this link?
 

Ms. Benjamin PD Cannon, ASCE
6x7 Networks & 6x7 Telecom, LLC 
CEO 
ben () 6by7 net[mailto:ben () 6by7 net]
"The only fully end-to-end encrypted global telecommunications company in the world.”
FCC License KJ6FJJ

 On Oct 30, 2020, at 7:19 AM, Jared Brown <nanog-isp () mail com> wrote:
 
Hello NANOG!

I need to push 100G over 100 km of dark fiber. Since there are no 100G pluggable optics with this reach (~25 dB), I 
have been offered coherent transport systems to solve my problem. This is all good and well, except total system costs 
start from high five figures.

So, my question is, do I have any other options?

I can't help noticing that you can break out a 100G QSFP into four 25G QSFPs. 25G DWDM systems are relatively 
inexpensive (low five figures), but can you make 25G DWDM go 100 km?

I only need the one 100G, so I don't really need a highly scalable DWDM system. I can't put anything midspan, or if I 
could it would cost more than just going with a coherent system.


Jared