Since light does not interact with electromagnetic fields, fiber optic sensors and cables are inherently immune to Electromagnetic Interference (EMI), Radio Frequency Interference (RFI), and High-Voltage surges. 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. In modern communication networks, signal. Fiber optics play a pivotal role in modern communication systems by providing unparalleled bandwidth, security, and resistance to electromagnetic interference. Fibre optic cables are non-metallic. The light signals propagate to the receiver through the fiber optic cable.