The LED light sources sometimes used with multi-mode fiber produce a range of wavelengths and these each propagate at different speeds. This chromatic dispersion is another limit to the useful length for multi-mode fiber optic cable.OverviewMulti-mode optical fiber is a type of mostly used for communication over short distances, such as within a building or on a campus. Multi-mode links can be used for data rates up to 800 Gbit/s. Multi-mode fiber has a f. The equipment used for communications over multi-mode optical fiber is less expensive than that for. Because of its high capacity and reliability, multi-mod.