Yes, multimode fiber can support 10 Gigabit Ethernet, but the maximum distance depends on the fiber type.

10G Support by Multimode Fiber Type

• OM1 (62.5 µm core): Supports 10G speeds only up to 33 meters due to limited modal bandwidth and higher signal dispersion, making it suitable only for very short connections .
• OM2 (50 µm core): Can handle 10G up to 82 meters, slightly better than OM1 but still limited for most enterprise networks .
• OM3 (50 µm, laser-optimized): Supports 10G up to 300 meters, making it suitable for most data center and LAN applications .
• OM4 (50 µm, enhanced laser-optimized): Extends 10G reach to 550 meters, ideal for longer intra-building connections and high-performance networks .
• OM5 (50 µm, wideband multimode): Backwards compatible with OM4, supports 10G up to 550 meters, and adds multi-wavelength support for future high-speed applications .

Key Considerations

• Distance Limitations: The maximum distance for 10G over multimode fiber is constrained by modal dispersion and attenuation. OM1 and OM2 are generally insufficient for typical 10G deployments beyond short patch runs .
• Transceiver Compatibility: Not all 10G transceivers work with older fiber types. 10GBASE-SR transceivers are commonly used for multimode fiber, but performance varies with OM1 and OM2 .
• Upgrading Fiber: For reliable 10G performance over longer distances, upgrading to OM3, OM4, or OM5 is recommended. These fibers are optimized for laser-based transmission and higher bandwidth .
• Cost vs. Performance: Multimode fiber is generally less expensive than single-mode fiber and is suitable for short-haul applications, but single-mode fiber is preferred for distances beyond 550 meters at 10G .

Summary

Multimode fiber does support 10G Ethernet, but the achievable distance depends heavily on the fiber type: OM1 and OM2 are limited to very short runs, while OM3, OM4, and OM5 provide sufficient reach for most enterprise and data center applications. For optimal performance and future-proofing, OM3 or higher is recommended for 10G deployments.