The IEEE 802.3ae committee ratified the 10 Gigabit Ethernet standard and along with the general specification, defined a number of fiber optic interfaces. These standard interfaces attempted to satisfy a number of different objectives including support for MMF and SMF compatibility.
10GBASE-SR transceivers are used in a data center to interconnect two Ethernet switches or to link an end-device (e.g. 10 Gigabit Ethernet servers or NAS device) to an Ethernet switch
10GBASE-LR transceivers are most commonly deployed in inter-building single mode connections
10GBASE-ER transceivers are most commonly deployed in between sites or locations of 40 kilometers
10GBASE-ZR transceivers are most commonly deployed in between sites or locations of 80 kilometers
TUNABLE DWDM SFP+
Increases capacity of fiber links through dense wave division multiplexing
10GBASE-Copper cables are most commonly deployed in data centers between two devices in the same rack (server to switch or switch to switch)