Unlike copper cables, fiber optic cables are immune to electromagnetic interference (EMI). Electromagnetic interference (EMI) can severely affect copper cabling systems, causing noise, errors, and network instability. This article explains what EMI is, how it occurs, and effective mitigation strategies like shielding, grounding, and filtering. These light pulses are not affected by electromagnetic interference, such as radio frequency interference, which can disrupt electrical signals in copper. Q: Is there and electromagnetic interference with optic cables? A: The fiber is glass and the cable is plastic, neither of which are affected by electromagnetic interference.