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Cablek industries Services News Technical reference

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.jpg
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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