Multimode fibers are identified by the OM (optical mode) designation as outlined in the ISO/IEC 11801 standard.
OM1, for fiber with 200/500 MHz*km overfilled launch (OFL) bandwidth at 850/1300nm (typically 62.5/125um fiber)
OM2, for fiber with 500/500 MHz*km OFL bandwidth at 850/1300nm (typically 50/125um fiber)
OM3, for laser-optimized 50um fiber having 2000 MHz*km effective modal bandwidth (EMB, also known as laser bandwidth), designed for 10 Gb/s transmission.
OM4, for laser-optimized 50um fiber having 4700 MHz*km EMB bandwidth designed for 10 Gb/s, 40 Gb/s, and 100 Gb/s transmission.
Reach and modal bandwidth
Fiber Types and Reach
Product (MHz*km or GHz*m)
10GBASE-SR Distance (meters)
40GBASE-SR4 and 100GBASE-SR10 Distance (meters)
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