With 100G now standard in enterprise data centers and 400G deployments accelerating, the multimode fiber upgrade question has sharpened: OM4 or OM5? This guide gives network engineers the definitive technical comparison to make the right infrastructure decision.
OM4 vs OM5: Key Specifications
| Parameter | OM4 | OM5 |
|---|---|---|
| Core/Cladding | 50/125 µm | 50/125 µm |
| Jacket Color | Aqua / Violet | Lime Green |
| Min. EMB @ 850 nm | 4700 MHz·km | 4700 MHz·km |
| Min. EMB @ 953 nm | Not specified | 2470 MHz·km |
| Max. attenuation @ 850 nm | 3.0 dB/km | 3.0 dB/km |
| Max. attenuation @ 953 nm | Not specified | 1.9 dB/km |
| 100G SWDM4 reach | 70–100 m | 150 m |
| 100G SR4 reach | 100 m | 100 m |
| 400G SR4.2 reach | ~50 m | ~50 m |
| Wavelength support | 850 nm only | 850, 880, 910, 953 nm (SWDM) |
The Core Difference: SWDM Technology
OM5 was designed to support SWDM (Short Wavelength Division Multiplexing) — using 4 wavelengths (850/880/910/953 nm) to achieve 100G over a single fiber pair instead of 8 fibers (4 Tx + 4 Rx as in SR4).
When SWDM on OM5 Matters
- High-density LC duplex patching: 100G SWDM4 uses LC duplex (2 fibers) vs 8-fiber MPO for SR4. Can double port density in crowded panels.
- Upgrading legacy LC duplex to 100G: OM5 + SWDM4 avoids re-pulling to MPO.
- Extended reach: OM5 reaches 150m on 100G SWDM4 vs OM4’s 70–100m on the same topology.
When OM5 Advantage Disappears
- MPO-based SR4 deployments: For 100G SR4, 400G SR4.2, or 800G SR8 — OM5 offers zero reach advantage over OM4.
- New builds with MPO infrastructure: OM4 is adequate and costs less.
- 400G and 800G: Current 400G/800G standards (DR4, FR4, SR8) don’t benefit from OM5’s SWDM properties.
100G Application Reach Comparison
| Application | OM4 Reach | OM5 Reach | Verdict |
|---|---|---|---|
| 100G SR4 (MPO) | 100 m | 100 m | Tie |
| 100G SWDM4 (LC duplex) | 70 m | 150 m | OM5 wins |
| 25G SFP28 SR | 70 m | 70 m | Tie |
| 40G SR4 | 150 m | 150 m | Tie |
| 400G SR4.2 | 50 m | 50 m | Tie |
Price Premium Analysis
OM5 assemblies carry a 15–30% premium over equivalent OM4 products. The premium is justified when SWDM4 adoption is in your roadmap. It is not justified for pure MPO-based deployments where SWDM will not be used.
The 400G “Future-Proofing” Question
OM5 is often cited for “future-proofing” 400G. The reality:
- 400G SR4.2 (QSFP-DD): Uses 850 nm only — same reach on OM4 and OM5 (~50m). No OM5 advantage.
- 400G SWDM8: Under development, not yet commercially deployed.
- 800G: Current standards use SR8 or 2×SR4 on MPO-16 — no SWDM equivalent exists today.
Bottom line: OM5 “future-proofing” for 400G is speculative. If your 400G roadmap is MPO-based (which most enterprise data centers use), OM4 is adequate.
Decision Matrix
| Scenario | Recommended | Reason |
|---|---|---|
| New data center, MPO cabling | OM4 | No SWDM benefit, lower cost |
| Upgrade legacy LC duplex to 100G | OM5 | SWDM4 maximizes existing infrastructure |
| High-density 100G, LC duplex | OM5 | SWDM4 doubles port density vs SR4 |
| 400G MPO deployment | OM4 | Same reach, 20–30% cost savings |
| Campus backbone ≤100m | OM4 | All 100G standards satisfied on OM4 |
ABPTEL OM4 and OM5 Assemblies
- MPO-12/MPO-16/MPO-24 trunk cables (OM4 and OM5), 1m–300m
- LC duplex and MPO fanout harness assemblies
- Pre-terminated breakout cables, custom lengths
- Elite low-loss MPO connectors (≤0.35 dB IL, ≥65 dB RL)
Share your data center layout and ABPTEL will recommend the optimal fiber type and connector configuration.
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FAQ
Can I mix OM4 and OM5 fiber in the same network?
Yes. The link performance is limited by the lower-grade fiber. OM4 and OM5 share the same 50/125 µm geometry and identical connectors — they are physically compatible. For SWDM applications, any OM4 segment eliminates the OM5 advantage.
Are OM5 and OM4 connectors the same?
Yes. OM5 uses the same LC, SC, MPO connectors as OM4. The only visual difference is the lime green jacket color vs aqua for OM4.
Talk to ABPTEL
Looking for the right optical hardware for your AI data center, GPU cluster, or FTTA project? ABPTEL ships from Shenzhen with OEM/ODM support, fast lead times, and engineering-level pre-sales advice.
- 🔥 400G & 800G OSFP / QSFP-DD Transceivers — for AI training fabrics and hyperscale spine-leaf
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- ⚡ AOC & DAC Cables — short-reach GPU interconnects, OEM compatible
- 🧩 SFP / SFP+ / SFP28 / QSFP28 Modules — 1G to 100G optical transceivers
- 📋 Data Center Cabling Solutions — end-to-end design guide
- ❓ Read our FAQ — compatibility, polarity, lead time, MOQ
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