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. To recap Optical Fiber can be divided into Multimode Fiber (MMF) and Single-Mode optical fiber (SMF). 5 µm—allowing multiple light modes to propagate simultaneously. This makes multimode fiber ideal for: Typical distance capabilities include: Multimode fiber pairs naturally with VCSEL-based transceivers, which are cheaper, consume less. R&M offers the full range of multimode fibers for all its cables, whether for installations or assemblies.