The short answer is no — but its role is shrinking. OM2 multimode fiber still supports cost-effective 1 Gbps and short-reach 10 Gbps deployments, yet OM3 and OM4 now dominate new data center and high-speed Ethernet builds. It just seems incredibly stupid to put the time and labor to lay a line that may be outdated within 10 years. Single mode has near unlimited bandwith multimode maxes out. With. Most multimode fiber types used today are OM3/OM4 and OM5, but there are still older network infrastructures, where cables inside buildings were laid a long time ago that use OM1, OM2 multimode fiber. It offers compatibility with modern 50 µm systems but is not ideal for high-density or high-speed. OM1 (Optical Multimode 1) fiber optic cabling is considered an older and less capable multimode fiber type compared to more recent generations.