100G over 100 km of dark fiber

Fri Oct 30 14:27:40 UTC 2020

Hi Jared,

If it’s just a single 100G channel needed you could try 100GBASE-ZR4. Specified for 80km, 30db power budget they could actually reach more the 80km.
Dispersion should also be „no" problem in the 1310nm length. I have to say that I never tried this on 100km distance without coherent solutions.

Best regards,
Vincentz
PS: https://www.flexoptix.net/en/transceiver/q-161hg-80.html?co10728=100306

> Am 30.10.2020 um 15:19 schrieb Jared Brown <nanog-isp at mail.com>:
> 
> 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

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