100G over 100 km of dark fiber

Jared Brown nanog-isp at mail.com
Tue Nov 3 18:16:11 UTC 2020

Turns out I was wrong, again.

There is at least one vendor that offers pluggable 100G QSFP28 optics that can reach 120 km with amplification.

Thanks to everybody that reached out! I appreciate all the input and lessons learned.



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.


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