How many meters of multimode fiber should be selected

Multimode fiber supports distances ranging from 33 meters to 550 meters depending on fiber type and data rate.

Distance Limits by Fiber Type and Data Rate

• OM1 (62.5 µm core, 200 MHz·km): Supports up to 275 meters at 1 Gbps and 33 meters at 10 Gbps, typically used for short-distance, low-speed LAN applications .
• OM2 (50 µm core, 500 MHz·km): Can transmit up to 550 meters at 1 Gbps and 82 meters at 10 Gbps, suitable for medium-speed networks .
• OM3 (50 µm laser-optimized, 2000 MHz·km): Supports 10 Gbps up to 300 meters, 40 Gbps up to 100 meters, and is commonly used in larger private networks or data centers .
• OM4 (50 µm laser-optimized, 4700 MHz·km): Extends distances to 550 meters at 10 Gbps and 150 meters at 40 Gbps, offering improved performance for high-speed applications .
• OM5 (50 µm laser-optimized, wideband for WDM): Supports 40 Gbps up to 150 meters and 100 Gbps up to 100 meters, enabling multiple wavelength signals for future-proof data center deployments .

Factors Affecting Multimode Fiber Distance

1. Data Rate: Higher speeds reduce maximum distance due to modal dispersion and signal spreading .
2. Light Source: LEDs are used for lower-speed OM1/OM2 fibers, while VCSEL lasers are used for OM3/OM4/OM5, allowing longer distances .
3. Fiber Quality and Components: Using standard-compliant connectors, transceivers, and bend-insensitive patch cables helps maintain signal integrity and maximize distance .
4. Modal Dispersion: Multimode fibers carry multiple light paths, and differences in arrival times limit distance, especially at high data rates .

Summary

For short-distance, low-speed networks, OM1 and OM2 are sufficient. For high-speed data centers, OM3, OM4, and OM5 are preferred, with OM5 offering the highest bandwidth and support for wavelength-division multiplexing. Maximum distances range from 33 meters for OM1 at 10 Gbps to 550 meters for OM4 at 10 Gbps, depending on fiber type, data rate, and network design .