A: The transmission distance of multimode fiber depends on the fiber type and data rate. Multi-mode optical fiber is a type of optical fiber mostly used for communication over short distances, such as within a building or on a campus. Multi-mode fiber has a fairly large core diameter that enables multiple light modes to be. This is a key factor affecting single mode fiber distance. 5 micrometers, while singlemode fiber has a much smaller. Multimode fibers (MMFs) have been a key component in short-reach transmission systems for over 50 years and remain the predominant transmission medium for Vertical Cavity Surface-Emitting Laser (VCSEL)-based short links in data centers. 5 µm, which makes it possible to move in several light modes or paths.