What are the markings on a multimode optical module

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Multimode optical modules are typically marked with the fiber type (OM1, OM2, OM3, OM4, OM5), connector color, and sometimes manufacturer, part number, and performance specifications.

Fiber Type and OM Classification

Multimode modules are labeled with OM designations to indicate the fiber type and performance characteristics. Common markings include:

OM1 – 62.5/125 µm core, legacy fiber for older networks.
OM2 – 50/125 µm core, suitable for 1G Ethernet and limited 10G applications.
OM3 – Laser-optimized 50/125 µm fiber for 10G/25G links up to 300–400 meters.
OM4 – Enhanced laser-optimized 50/125 µm fiber for higher-speed links up to 550 meters.
OM5 – Wideband multimode fiber supporting shortwave wavelength division multiplexing (SWDM) for high-speed data centers ( ).

Connector Color Coding

ANSI/TIA-598-C and industry conventions use connector colors to indicate fiber type:

Orange – Standard multimode (OM1/OM2)
Aqua – Laser-optimized multimode (OM3/OM4)
Lime Green – OM5 wideband multimode These colors help quickly identify the module type and ensure compatibility with the fiber cabling ( ).

Additional Markings

Modules and cables often include:

Manufacturer name and part number for traceability.
Fiber count (e.g., 12F, 24F) for multi-fiber cables.
Fire rating (OFNR, OFNP, LSZH) indicating compliance with safety standards.
Compliance standards such as ISO, IEC, or UL.
Date of manufacture for warranty and lifecycle tracking ( ).

Summary

By reading the markings on a multimode optical module, you can determine the fiber type, connector type, performance capabilities, and compliance information, which is essential for proper installation, network planning, and ensuring high-speed data transmission compatibility.

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