1. Home
  2. Блог
  3. Data Center
  4. Multimode (OM1, OM2, OM3, OM4, OM5) and Single Mode (OS1, OS2) Fiber

Blog

Multimode (OM1, OM2, OM3, OM4, OM5) and Single Mode (OS1, OS2) Fiber

What are OM and OS type fiber optic cables?
In ANSI/TIA-568.3-D, the TIA adopted the nomenclature for fiber found in the international standard ISO/IEC 11801. The multimode fiber is prefixed with “OM” and the singlemode mode “OS”.

The new designation in ANSI/TIA-568.3-D should alleviate some of the confusion associated with application support distance issues. Each “OM” has a minimum Modal Bandwidth (MBW) requirement.

Bandwidth and attenuation comparison between different OM fiber optic cables

Multimode Fiber Overfilled launch bandwidth (MHz.km) Laser Launch Attenuations (dB/km)
Fiber Type TIA Fiber Standard Core diameter (um) 850 nm 1300 nm 850 nm 850nm 1300nm
OM1 492-AAAA 62.5 200 500 Not specified 3.5 1.5
OM2 492-AAAB 50 500 500 Not specified 3.5 1.5
OM3 492-AAAC 50 1500 500 2,000 2.3 0.6
OM4 492-AAAD 50 3500 500 4,700 2.3 0.6
OM5 492-AAAE 50 3500 500 4,700 2.4 0.6

Attenuation refered to YOFC Multimode Fiber.

Maximum channel length comparison between different OM fiber optic cables

 Fiber Mode 100BASE 1000BASE 10GBASE 40GBASE 100GBASE
850nm 1300nm 850nm 1300nm
OM1 up to 2000m 275m 550m 33m up to 300m Not specified Not specified
OM2 up to 2000m 550m 550m 82m up to 300m Not specified Not specified
OM3 up to 2000m 550m 550m 300m up to 300m 100m 100m
OM4 up to 2000m 1000m 550m 550m 400m* 150m 150m
OM5 up to 2000m Not specified Not specified Not specified 400m* 150m 150m

Attenuation comparison between different OS fiber optic cables

  1310 nm 1383nm 1550 nm
OS1(EN50173-1:Ed.2: 2010) 1.0 dB/km 1.0 dB/km 1.0 dB/km
OS2(EN50173-1:Ed.2: 2010) 0.4 dB/km 0.4 dB/km 0.4 dB/km
OS1(ISO/IEC11801Ed.2.2:2010) 1.0 dB/km Not specified 1.0 dB/km
OS2(ISO/IEC11801Ed.2.2: 2010) 0.4 dB/km 0.4 dB/km 0.4 dB/km
OS2(ISO/IEC24702: 2006) 0.4 dB/km 0.4 dB/km 0.4 dB/km

Related Posts

  • Types of Fiber and Fiber Optic Cable Construction - FTTA Fundamentals 2

    Types of Fiber An optical fiber transmits light through a flexible, transparent strand of pure glass not much wider than a human hair. It functions as a waveguide, or “light pipe,” to direct the light. On a cell tower, an optical transceiver module inside the towermounted radio converts the optical…

  • What is the difference Among OM1, OM2, OM3, OM4 and OM5

    Multimode fibers are identified by the OM (“optical mode”) designation as outlined in the ISO/IEC 11801 standard. OM1, for fiber with 200/500MHz*km overfilled launch (OFL) bandwidth at 850/1300nm (typically 62.5/125um fiber) OM2, Type A1a.1 , for fiber with 500/500MHz*km OFL bandwidth at 850/1300nm (typically 50/125um fiber) OM3, Type A1a.2, for…

  • OM4 fiber optic cabling

    What is OM4 ? Based on The New TIA/EIA Standard, OM4 is a laser-optimized, high bandwidth 50µm multimode fiber. In August of 2009, TIA/EIA approved and released 492AAAD, which defines the performance criteria for this grade of optical fiber. While they developed the original “OM” designations, IEC has not yet…

  • FAQ about 100G Ethernet Transmission

    What standard addresses 100G, and when will this standard be complete? The IEEE 802.3ba technical requirements were ratified in the recent April 2010 sponsor ballot. The document has been forwarded for approval to RevCom and is expected to be released in June 2010. When is customer implementation of 100G expected?…

  • Fiber Optic Connector Types for data center

    LC and MPO Fiber Optic connectors were defined for data center applications in accordance with ISO/IEC 24764, EN 50173-5 and TIA-942 standards for fiber optic cabling systems. MPO Connector (IEC 61754-7) MPO (multipath push-on) is based on a plastic ferrule that provides the ability to house up to 24 fibers…

Data Center, Fiber Optic Cable
WhatsApp TARLUZ