I didn't realize QSFP don't have a ZR analogue, guessing it's power budget. So I'm trying to figure if a 40/100gb ER4 rated for 40km will be fine with doing 42.5-44km (depending on what tool you're using to measure) It's just slightly out of spec and am not sure on the quality of the glass, but am pretty sure it's carrier grade corning for most of it.
I'm guessing there will be less errors on 40gb at that distance than 100gb so wanted to see what others might think of it.
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