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 enable the propagation of multiple modes, treating each as a distinct channel, thereby increasing their capacity compared to single-mode fiber (SMF). SMF supports just one spatial mode. In contrast, multi-mode fibers can operate with two polarization states.