Their bandwidth is relatively comparable to singlemode fiber cables, delivering between 1Gbps and 10 Gbps depending on cable length. At lower data rates, such as 1G, multimode fiber can support longer distances compared to higher data rates. 5 microns that enables multiple light modes to be propagated. The LED. It has a core diameter of 50 µm and a modal bandwidth of 2000 MHz/km. Its main advantage is that it uses laser-optimized multimode fiber (LO-MMF), which is designed to work with vertical-cavity surface-emitting lasers (VCSEL) and was made to support faster networking speeds such as 10G, 40G, and. Multimode fiber (MMF) is an optical fiber designed to carry multiple light propagation paths—or modes—simultaneously. The wider core accepts light from. OM1 fiber through OM5 fibe show steady improvements in multimode fiber optics. Core Size Evolution OM1 has a 62.