Multimode fiber optic module specifications and models

Multimode fiber optic modules are designed to support high-speed data transmission over short to medium distances using OM1, OM2, OM3, OM4, or OM5 fibers, with common models including SFP, SFP+, and QSFP modules.

Multimode Fiber Types and Compatibility

Multimode fibers (MMF) are classified into OM1, OM2, OM3, OM4, and OM5, each with distinct core sizes, bandwidths, and maximum link distances: OM1: 62. 5 µm core, LED source, supports 10 GbE up to 33 meters, typically orange jacket. OM2: 50 µm core, LED source, supports 10 GbE up to 82 meters, orange jacket.

OM3: 50 µm core, laser-optimized for VCSELs, supports 10 GbE up to 300 meters, 40/100 GbE up to 100 meters, aqua jacket. OM4: 50 µm core, enhanced laser-optimized, supports 10 GbE up to 550 meters, 40/100 GbE up to 150 meters, aqua jacket. OM5: 50 µm core, wideband multimode fiber supporting multiple wavelengths for shortwave WDM, suitable for high-speed data centers, lime green jacket.

Common Multimode Fiber Optic Modules

Multimode modules are typically available in SFP, SFP+, and QSFP form factors, designed for different data rates and distances: SFP (Small Form-factor Pluggable): Supports 1–10 GbE over multimode fiber, commonly used for short-range connections in enterprise networks. SFP+: Supports 10–25 GbE, optimized for OM3/OM4 fibers, with link distances up to 300–400 meters for 10 GbE and shorter for higher speeds.

QSF

P (Quad Small Form-factor Pluggable): Supports 40–100 GbE, often using parallel multimode fiber (MPO connectors). For example, Cisco QSFP-100G modules support 100GBase-SR4 over OM3 up to 70 meters and OM4 up to 100 meters, and 100GBase-SL4 for shorter links (20–30 meters),.

Key Considerations for Module Selection

Fiber Type: Ensure the module matches the multimode fiber type (OM3/OM4/OM5) for optimal performance. Data Rate: Choose modules that support the required Ethernet speed (10G, 40G, 100G). Link Distance: Verify the module's maximum supported distance over the selected fiber type.

Connector Type: Modules may use LC or MPO connectors depending on single or parallel fiber applications. Laser Source: VCSELs are commonly used for OM3/OM4/OM5 fibers, while LEDs are used for OM1/OM2.

Summary

For modern enterprise and data center networks, OM3, OM4, and OM5 fibers paired with SFP+, QSFP, or QSFP28 modules are the most common choices, providing high-speed, cost-effective, and reliable multimode optical links. Older infrastructures may still use OM1 or OM2 fibers with LED-based SFP modules for lower-speed applications. Proper selection ensures compatibility, optimal link performance, and future-proofing for network upgrades.