OM5 Fiber: One Pair, Several Wavelengths
Quick answer / TL;DR: Short answer: OM5 behaves like OM4 for standard 10G to 400 m and adds the ability to run SWDM4, carrying 40G or 100G on a single duplex pair. Specify it where fibre count is constrained and SWDM optics are planned. If you are not using SWDM, OM4 is cheaper for the same reach.
Fiber cords: two connector families, two fiber types, three polish options.OM5 is a wideband multimode fibre designed for shortwave division multiplexing: several wavelengths on one pair, instead of parallel fibres.
It is backward compatible with OM3 and OM4, which makes it an upgrade path rather than a fork.
What Is Different
| Property | OM4 | OM5 |
|---|
| Core | 50 micron | 50 micron |
| Standard reach at 10G | 400 m | 400 m |
| Wavelengths | 850 nm | 850 to 953 nm |
| SWDM support | No | Yes |
The extra wavelength window is the whole product: it lets four channels share one pair instead of four pairs.
When It Pays
- Duct or tray space is the constraint
- SWDM4 optics are already specified
- Migration from OM4 without re-pulling
- Data centre links where pair count matters
If none of those apply, the premium buys capability you will not use.
Real-World Applications
A data hall with full trays and a 100G requirement can use OM5 with SWDM4 instead of pulling more fibre. An office backbone at 10G does not benefit and should stay on OM4.
Standards and Verification
| Reference | Relevance |
|---|
| ISO/IEC 11801 | OM5 category |
| TIA-492AAAE | Wideband multimode fibre |
| IEEE 802.3 | Reach by PHY |
SWDM optics availability for a specific platform is not provided in the knowledge base. Confirm with the switch vendor.
References
- ISO/IEC 11801-1, Generic cabling
- TIA-492AAAE, Wideband multimode fibre
- IEEE 802.3, Ethernet
Practical Notes
Order OM5 patch cords in a distinct colour and label them. Mixing them with OM4 loses the only advantage you paid for.
Related reading: fiber cable — blogs/news/fiber-cable
Related reading: powered fiber cable — blogs/news/powered-fiber-cable
Related reading: om3 fiber cable — blogs/news/om3-fiber-cable
Frequently Asked Questions
Is OM5 faster than OM4?
Not on a single wavelength. It adds wavelength capacity.
Is it backward compatible?
Yes, with OM3 and OM4 links.
Do I need it?
Only with SWDM optics or constrained fibre count.
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