Fiber optic converters (also known as media converters) are devices that convert the electrical signal used in copper wiring such as Ethernet or serial data into light waves for transmission via fiber optic cable.

Connectivity: Fiber SFP Module vs Fiber Media Converter

An SFP module is a Small Form-Factor Pluggable. Simply put, it's a small transceiver that can send and receive data over fiber. SFPs connect to the network switch or media converter. We have SFP, SFP+, SFP28, QSFP+, QSFP28, 10-Gigabit Ethernet SFP, 25G SFP and 100G SFP.
A fiber media converter is a simple network device that makes it possible to connect two different media types as a twisted pair with fiber optic cabling.