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OS1 and OS2

Mode: Singlemode.

Bi-Directional, only one line / cable core needed.

"Only one side can sent at once", used for longer distances.


OM1 / OM2 / OM3 / OM4 / OM5

Mode: Multimode.

"Two lines / cable cores each for 'one way' of data", used for "short" distances.


Simplex vs Duplex fiber

  • Simplex cable are consisting of a single cable strand.
  • Duplex cable are consisting of two cable strands ("glued" together).

Singlemode vs Multimode

  • Singlemode only allows one light mode to pass through at a time.
    • Wikipedia
    • Advantages:
      • Much further distances (e.g., OS2 up to 10 kilometers for 10G).
      • Good for WAN network "applications".
    • Disadvantages:
      • Higher cost (depending on where you buy, up to 6-times more expensive).
  • Multimode have shorter reach though are because of their price better suited, for, e.g., in datacenter usage.
    • Wikipedia
    • Advantages:
      • Lower cost (in comparison with Singlemode).
      • Compatible with many different data protocols, e.g., ethernet.
    • Disadvantages:
      • Nowhere near the distance of Singlemode (e.g., OM4 10G distance is "only" up to 550 meters).