What is the difference between OM1, OM2, OM3, OM4

2018.05.22 07:31

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What is the difference between OM1, OM2, OM3, OM4
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
Fiber Type
Bandwidth*Length
Product (MHz*km or GHz*m)
10GBASE-SR Distance (meters)
40GBASE-SR4 and 100GBASE-SR10 Distance (meters)
OM1
160-200
33
N/A
OM2
400-500
82
N/A
OM3
2000
300
100
OM4
4700
400
150
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