I have a 10Gbps link over single mode fiber and I didn't even have to fiddle with it.
Is this good?
status: link-okauto-negotiation: done
rate: 10Gbps
full-duplex: yes
sfp-type: SFP-or-SFP+
sfp-connector-type: LC
sfp-link-length-sm: 2km
sfp-wavelength: 1310nm
sfp-temperature: 37C
sfp-supply-voltage: 3.223V
sfp-tx-bias-current: 44mA
sfp-tx-power: -0.777dBm
sfp-rx-power: -2.347dBm