OM2 fiber refers to multimode fiber that, at the 850/1300 nm windows, provides overfilled launch bandwidth of 500/500 MHz·km or higher. It uses LED light sources, has a core diameter of 50 μm, and typically features an orange outer jacket. It can be used in Ethernet networks below 10 Gbps and is most commonly deployed in Gigabit Ethernet. Compared with OM1 fiber, OM2 fiber has a reduced core diameter, which effectively lowers the modal dispersion of multimode fiber, increases bandwidth, and reduces manufacturing costs by one‑third. OM2 (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.
• Superior geometry uniformity
• Low attenuation
• High bandwidth at wavelengths of 850nm and 1300nm
• Manufactured by PCVD process
• Extremely refined refractive index profile
• 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 | -- | ≤1.0 | [%] |
| Coating Diameter | -- | 245±7 | [μm] |
| Coating/Cladding Concentricity Error | -- | ≤10.0 | [μm] |
| Coating Non-Circularity | -- | ≤6.0 | [%] |
| Core/Cladding Concentricity Error | -- | ≤1.5 | [μm] |
| Delivery Length | -- | Up to 17.6 | [km/reel] |
| Optical Characteristics | |||
| Attenuation | 850nm | ≤2.3 | [dB/km] |
| 1300nm | ≤0.6 | [dB/km] | |
| Overfilled Modal Bandwidth | 850nm | ≥500 | [MHz·km] |
| 1300nm | ≥500 | [MHz·km] | |
| 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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