Gigabit fiber optic cable specifications

Gigabit fiber optic cables support 1 Gbps Ethernet over multimode or single-mode fiber, with distances ranging from hundreds of meters to tens of kilometers depending on fiber type and standard.

Fiber Types and Standards

Multimode Fiber (MMF) is commonly used for shorter distances in LANs and data centers. Key types include: OM1: 62. 5 µm core, LED source, supports 1 Gbps up to ~275 m.

OM2: 50 µm core, LED source, supports 1 Gbps up to ~550 m. OM3: 50 µm core, laser-optimized, supports 1 Gbps up to 1 km, 10 Gbps up to 300 m. OM4: 50 µm core, laser-optimized, supports 1 Gbps up to 1 km, 10 Gbps up to 550 m.

OM5: 50 µm core, wideband multimode, supports multiple WDM channels at 28 Gbps per channel, backward compatible with OM4.

Single-

Mode Fiber (SMF) is used for longer distances: 1000BASE-LX/LH: Operates over SMF up to 10 km; can also run on MMF up to 550 m with mode-conditioning patch cables. 1000BASE-EX: SMF up to 40 km. 1000BASE-ZX: SMF up to ~70 km, depending on fiber quality and link budget.

Gigabit Ethernet Standards1000BASE-SX: Short-wavelength MMF, typically 850 nm, distances up to 550 m on 50 µm fiber. 1000BASE-LX: Long-wavelength SMF, typically 1310 nm, distances up to 10 km. 1000BASE-EX: Extended distance SMF, 1310 nm, up to 40 km.

1000BASE-ZX: Extra-long distance SMF, 1550 nm, up to 70 km. Connectors and ModulesSFP (Small Form-Factor Pluggable) modules are widely used for Gigabit fiber connections, allowing hot-swappable installation on switches and routers.

GBI

C modules are older, larger alternatives. Common connectors include LC, SC, and ST types, depending on the module and fiber type.

Performance Considerations

Encoding: 1000BASE-X standards use 8b/10b encoding, adding ~25% overhead for DC balance and clock recovery. Attenuation and link budget: Fiber quality, splices, and connectors affect maximum achievable distance. Mode-conditioning patch cables: Required when running LX over legacy MMF to reduce differential mode delay.

Summary

Gigabit fiber optic cables provide flexible deployment options: Short-range LANs: OM2/OM3/OM4 multimode fiber with 1000BASE-SX. Medium-range campus networks: 1000BASE-LX over SMF or laser-optimized MMF. Long-range metropolitan or inter-building links: 1000BASE-EX or 1000BASE-ZX over SMF.

Choosing the right fiber type, standard, and SFP module ensures reliable 1 Gbps performance while optimizing cost and distance requirements.