I've been looking into 40/100gbps options for fibre runs over 40km. It seems there's currently a big gap in the reach available between 10gbps and 40/100gbps optics for QSFP+ / QSFP28 interfaces.
As best I can tell, the only real option is to look at hardware with CFP/CFP2 interfaces.
I found an article from a few years back where Inphi seemed close to releasing 80km PAM4 modules (colorZ), but can't find them for sale.
Interested to know how other people are approaching the longer-haul metro runs. Has anyone got any idea when we'll see 40/100g optics with longer ranges in the QSFP form factors?
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