An all-optical Ethernet switch is a network switch whose service ports are entirely optical, meaning every interface uses fiber rather than copper. This design enables end-to-end optical signal transmission, avoiding the conversion between electrical and optical signals at the switch port level. Every time that light needs to change direction or jump. Switches come in three types: those with purely Ethernet ports, those with purely optical ports, and those with a combination of both. Port types are limited to two: optical and Ethernet.