Allied Telesis AT-SP10LRa/I 10GBASE-LR, 1310 nm, 10 km with SMF, I-Temp, TAA Compliant SFP+ Module 5 1

Works fine, price hurts

Does what it says. Linked over SMF at 1310nm and passed traffic immediately. I don't have much to complain about honestly, it's just expensive for a single module, but that's kind of normal with this stuff. So far no drops.

5