How many meters is a single multimode optical fiber

A single multimode optical fiber can typically transmit signals over distances ranging from 33 meters to 550 meters, depending on the fiber type and data rate.

Typical Distances by Fiber Type

• OM1 (62.5 µm core): Supports 10 Gigabit Ethernet up to 33 meters and 1 Gigabit Ethernet up to 275 meters. Commonly used for 100 Megabit Ethernet applications within buildings .
• OM2 (50 µm core): Supports 10 Gigabit Ethernet up to 82 meters and 1 Gigabit Ethernet up to 550 meters .
• OM3 (50 µm, laser-optimized): Supports 10 Gigabit Ethernet up to 300 meters, and 40/100 Gigabit Ethernet up to 100 meters .
• OM4 (50 µm, enhanced laser-optimized): Extends 10 Gigabit Ethernet links up to 550 meters, and 40/100 Gigabit Ethernet up to 150 meters .
• OM5 (50 µm, wideband multimode): Similar to OM4 but optimized for shortwave wavelength division multiplexing, supporting high-speed data over comparable distances .

Factors Affecting Distance

The maximum distance a multimode fiber can carry a signal depends on:

• Data rate: Higher speeds reduce the maximum distance due to modal dispersion .
• Fiber core size and type: Larger cores (OM1) have shorter distances at high speeds, while laser-optimized fibers (OM3/OM4) allow longer distances .
• Light source: LEDs are used in OM1/OM2, while VCSEL lasers are used in OM3/OM4/OM5, improving distance and bandwidth .
• Modal dispersion: Multimode fibers support multiple light paths, which can cause signal spreading and limit distance .

Summary

For short-range applications, such as within a building or data center, multimode fibers are ideal for distances up to several hundred meters, with OM3 and OM4 being the most common for modern high-speed networks. For longer distances beyond 500 meters, single-mode fiber is preferred due to its ability to carry signals over kilometers without significant dispersion .