(1×9 package--welding optical module, the general speed is not higher than gigabit, and SC interface SFF package is mostly used--soldering small package optical module, the general speed is not higher than gigabit, and LC interface GBIC package is mostly used-thermal Plug-in Gigabit interface optical module, using SC interface SFP package -- hot-plug small package module, currently the highest data rate can reach 4G, mostly using LC interface XENPAK package -- used in 10 Gigabit Ethernet, using SC interface XFP package --10G optical module, can be used in 10 Gigabit Ethernet, SONET and other systems, mostly using LC interface)