OM5 fibre enhances reach for SWDM

OM5 banner

We've added Nexans LANmark-OF OM5 to our range of warranty modules. OM5 fibre is developed by the cabling industry to address multiple wavelengths. With the increasing need for higher speeds, multiple wavelengths in the 850nm-930nm range are now used for new protocols like Short Wavelength Division Multiplexing (SWDM) and Bi-Directional (BiDi) transmission.

However, after these new protocols were developed, it turned out that the existing and more cost effective OM4 can also support these applications in the majority of cases.


The performance of OM4 and OM5 for advanced multimode protocols is as follows:

  • For parallel optics for 40G (40GBASE-SR4) and 100G (100GBASE-SR4) only one wavelength (850nm) is used. There is no difference in reach between OM4 and OM5.
  • For duplex transmission based on SWDM OM5 has extended reach beyond OM4. The reach of OM4 is sufficiently large to meet most market needs.
  • BiDi is using 2 different wavelengths and DLC connectivity.  The reach of this proprietary protocol for 100G is currently limited to 100m for both OM4 and OM5.



Below table shows the reach for OM4 and OM5 compared to various protocols.



Based on the above table, we advise LANmark-OF OM4 in the majority of projects, and to keep  LANmark-OF OM5 where extended reach is required. Details on reach for more complex channels can be found in our Nexans warranty modules.