Multi-mode fibers are fibres designed to allow multiple modes to propagate through it where each mode is considered as separate channel enhancing its capacity in contrast to single mode fibre (SMF) that only supports single spatial mode, however MMF has two polarizations.
Multi-mode fibers are engineered to support multiple modes for transmission, which contrasts with single-mode fiber (SMF), which accommodates only a single spatial mode. Multi-mode fibers have the capability of operating in two polarization states.