Fibre Optic Cable

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Optical fibre consists of a core surrounded by a cladding of a different refactive index. Light is launched into the core and propogates down the fibre due to total internal reflection.
This optical fibre can be further ruggedised to protect it in different environments.

Common ruggedisations are :


  • 250um bare fibre
  • 900um buffered fibre
  • 2mm ruggedised
  • 3mm ruggedised

Fibre is also categorised by propogation mode, the most widely employed modes are singlemode and multimode.


Singlemode fibre :

  • Usually 9/125, which denotes the core diameter as 9 micron (um) and the cladding diameter as 125 micron (um)
  • Due to the small core diameter the number of light reflections as the signal travels down the fibre is low allowing the signal to travel faster and longer making it ideal for lnger fibre runs

Multimode fibre :

  • Multimode fibers are described by either their core/cladding diameter or by using a system of classification determined by the ISO 11801 standard — OM1, OM2, and OM3 — which is based on the modal bandwidth of the multi-mode fiber. OM4 (defined in TIA-492-AAAD) was finalized in August 2009 and was published by the end of 2009 by the TIA.
  • Usually 50/125 or 62.5/125, 50 or 62.5 micron (um) core and cladding diameter of 125 micron (um)
  • The larger core results in the fibre been able to transfer more data but the number of reflections increases resulting in reduced signal strength over distance
  • OM1 has a core size of 62.5 micrometers (µm) meanwhile OM2, OM3 and OM4 have a core of 50µm
  • OM3 is backward compatible with OM2 and OM4 is backward compatible with OM3 and OM2

alker stock a range of singlemode and multimode fibres in the different ruggedisations.

If you would like your details printed on the cable jacket or would like a fibre not listed please contact us.

Do you need a Patch Panel?alker offer a full range of Patch Panels Alker Optical Equipment Patch Panels
Do you need an adaptor?alker offer a full range of compatible adaptors Alker Optical Equipment Adaptors

If the product you need is not listed or you need a little technical assistance please contact us and we shall do our best to help you:

Phone number: 01342 870 941
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