Longest communication distance of multimode fiber

The maximum distance of multimode fiber depends on the fiber type and data rate, with OM5 supporting up to 400 meters at lower speeds and 100 meters at 100 Gbps.

Multimode Fiber Types and Maximum Distances

Multimode fibers are classified as OM1, OM2, OM3, OM4, and OM5, each with different core sizes, bandwidths, and distance capabilities: OM1 (62. 5 µm core): Supports 1 Gbps up to 275 meters and 10 Gbps up to 33 meters, typically used for short-distance LANs with LED light sources. OM2 (50 µm core): Extends 1 Gbps up to 550 meters and 10 Gbps up to 82 meters; under optimal conditions, 1 Gbps can reach up to 2 km.

OM3 (50 µm laser-optimized): Supports 10 Gbps up to 300 meters, 40 Gbps up to 100 meters, and 100 Gbps up to 100 meters, using VCSELs for improved performance. OM4 (50 µm laser-optimized): Offers longer distances than OM3 due to higher modal bandwidth (4700 MHz/km), supporting 10 Gbps up to 400 meters, 40 Gbps up to 150 meters, and 100 Gbps up to 100 meters. OM5 (50 µm wideband multimode fiber): Designed for short-wavelength division multiplexing (SWDM), OM5 supports 40 Gbps up to 150 meters and 100 Gbps up to 100 meters, with potential for longer distances using multiple wavelengths.

Factors Affecting Maximum Distance

Data Rate: Higher speeds reduce maximum distance due to increased signal attenuation and modal dispersion. Light Source: LEDs are suitable for short distances, while VCSELs enable longer reach and higher bandwidth. Fiber Quality and Installation: High-quality connectors, minimal splices, and proper cable management reduce losses and maintain signal integrity.

Wavelength: Shorter wavelengths (850 nm) generally support longer distances in multimode fibers.

Summary

For long-distance multimode fiber applications, OM4 and OM5 are preferred, especially in data centers requiring high-speed Ethernet. While single-mode fiber can achieve much longer distances, multimode fiber remains cost-effective for short- to medium-range high-bandwidth networks, with OM5 offering the most future-proof solution for multi-wavelength, high-speed transmission.