OM4 fiber is an upgraded version of OM3 multimode fiber, offering superior performance. For example, the effective bandwidth of OM4 fiber is more than double that of OM3 fiber, and it is backward compatible with OM3 fiber, with an aqua outer jacket. In Ethernet networks above 10 Gbps, OM4 fiber supports longer transmission distances than OM3, reaching up to 400 meters. OM4 (50/125 μm) graded‑index multimode fiber meets or exceeds the requirements of the ISO/IEC 11801-1 OM1 specification, the IEC 60793-2-10 A1-OM1 specification, and the TIA-492AAAF A1-OM1 specification.
• Optimized for 850nm VCSEL
• Compatibility with current OM4 multimode fibre
• Superior geometry uniformity
• Low attenuation
• High bandwidth
• Low differential mode delay (DMD)
• High resistance to micro-bending
• Optimized performance in tight-buffer cable applications
• Stable performance over a wide range of environmental conditions
| Characteristics | Conditions | Specified Values | Units |
|---|---|---|---|
| Geometry Characteristics | |||
| Core Diameter | -- | 50±2.5 | [μm] |
| Core Non-Circularity | -- | ≤5.0 | [%] |
| Cladding Diameter | -- | 125.0±1.0 | [μm] |
| Cladding Non-Circularity | -- | ≤0.6 | [%] |
| Coating Diameter | -- | 245±7 | [μm] |
| Coating/Cladding Concentricity Error | -- | ≤10.0 | [μm] |
| Coating Non-Circularity | -- | ≤6.0 | [%] |
| Core/Cladding Concentricity Error | -- | ≤1.0 | [μm] |
| Delivery Length | -- | Up to 8.8 | [km/reel] |
| Optical Characteristics | |||
| Attenuation | 850nm | ≤2.4 | [dB/km] |
| 1300nm | ≤0.6 | [dB/km] | |
| -- | -- | OM4 Bend Insensitive | -- |
| Overfilled Modal Bandwidth | 850nm | ≥700/≥1500/≥3500 | [MHz·km] |
| 1300nm | ≥500/≥500/≥500 | [MHz·km] | |
| Effective Modal Bandwidth | 850nm | ≥950/≥2000/≥4700 | [MHz·km] |
| Application support distance on | -- | -- | -- |
| 40GBASE-SR4 / 100GBASE-SR10 | 850nm | -/140/170 | [m] |
| 10GBASE-SR | 850nm | 150/300/550 | [m] |
| 1000BASE-SR | 850nm | 750/1000/1100 | [m] |
| DMD Specification | Compliant with and more stringent than the requirements of IEC60793-2-10 | -- | -- |
| Numerical Aperture | -- | 0.200±0.015 | -- |
| Group Refractive Index | 850nm | 1.482 | -- |
| 1300nm | 1.477 | -- | |
| Zero Dispersion Wavelength(λ₀) | -- | 1295-1340 | [nm] |
| Zero Dispersion Slope(S₀) | 1295nm≤λ₀≤1310nm | ≤0.105 | [ps/(nm²·km)] |
| 1310nm≤λ₀≤1340nm | ≤0.000375(1590-λ₀) | [ps/(nm²·km)] | |
| Macrobending Loss | -- | -- | -- |
| 2 Turns @ 15 mm Radius | 850nm | ≤0.1 | [dB] |
| 1300nm | ≤0.3 | [dB] | |
| 2 Turns @ 7.5 mm Radius | 850nm | ≤0.2 | [dB] |
| 1300nm | ≤0.5 | [dB] | |
| Backscatter Characteristics 1300nm | |||
| Step（Mean of Bidirectional Measurement） | -- | ≤0.10 | [dB] |
| Irregularities Over Fibre Length and Point Discontinuity | -- | ≤0.10 | [dB] |
| Attenuation Uniformity | -- | ≤0.08 | [dB/km] |
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