Multimode fiber has a larger core (typically 50 or 62. 5 microns) and can carry multiple light signals, usually LEDS, at once. While that's great for short distances, those overlapping signals can bump into each other and cause distortion over longer distances. There are two main types of fiber optic cables: single mode and multimode. That makes picking between single mode and multimode fiber optic cables an. Single mode fiber has a very narrow core (around 8–10 microns in diameter), so it only allows one light signal (or "mode") to pass through at a time. It has a narrow core diameter of 8-10 microns and uses a laser or. Whether data is being moved between facilities, connected to a data centre, or integrated into a broader communications system, the type of optical fiber in use has a direct impact on speed, reliability, and long-term scalability.