Fiber/Optical is taking out any emi rfi and cleaning the signal up.
Similar to using the small green computer optical isolation bundle
Was a thread on this at one point.
- Seamless Conversion of LC Fiber to Copper – This fiber optic to ethernet media converter kit includes a multimode 1000BASE-SX SFP module(850nm), which enables you to convert 1000BASE-SX LC fiber to 10/100/1000 Base-T RJ-45 copper media or vice versa
- Extend Your Transmission Distance – By using this ethernet fiber media converter, you can easily extend link distance up to 550 meters/ 1804 ft via OM3/OM4 multimode fiber (MMF, LC, Duplex)
- Plug and Play – No software installation or configuration required. Hot-swappable design makes this ethernet fiber converter easy to install and troubleshoot
- Reliable Auto-Negotiation Gigabit Connection – 10/100/1000Mbps Auto-Negotiation RJ45 Port supports Auto-MDI/MDIX Crossover and Half-Duplex / Full-Duplex Transfer Mode, bridging different network speeds and devices to a Gigabit fiber network