What is the difference between SFP and SFP+?

SFP means Small factor Pluggable, hence from dimensions perspective SFP and SFP+ are the same and visually the same.

The main difference between SFP and SFP+ lies in their speed: SFP+ supports higher data rates, up to 10 Gbit/s. This difference in bandwidth also affects transmission distance — standard SFP modules typically offer longer reach. The SFP+ standard is defined by SFF-8431.

Regarding compatibility, an SFP+ port can usually accept an SFP module, but only at the lower speed of 1 Gbit/s.

For compatibility between your SFP+ port and an SFP or the reverse you need to check the data sheets of your switch and transceiver manufacturer.

SFP network port refers to the Network port of your device where you will put the SFP to enable network communication.

SFP 1G, SFP 1g sx 85, sfp1g-sx-85, 1000Base-LX-31 SFP 1310nm 10km, 1000 Base LX 31 SFP are different names for different models of SFP 1G.