Multimode optical cables (OM1–OM5) vary by core size, bandwidth, maximum distance, and data rate, with OM3, OM4, and OM5 optimized for high-speed data center applications.

Multimode Fiber Types and Specifications

Notes on Specifications:

• OM1 and OM2 are legacy fibers, primarily using LED sources, suitable for short-distance LAN applications .
• OM3, OM4, and OM5 are laser-optimized multimode fibers (LOMMF), designed for VCSEL sources and high-speed data center links .
• OM4 and OM5 support higher bandwidth and longer distances for 40/100 GbE applications, making them ideal for modern enterprise and cloud computing environments .
• OM5 supports shortwave wavelength division multiplexing (SWDM), allowing multiple wavelengths over a single fiber for increased capacity .

Multimode Trunk Cable Optical Specifications

• Attenuation: Measured in dB/km according to EIA 455 FOTP standards (e.g., FOTP 58, 164, 167) and varies by wavelength and fiber type .
• Link Loss: Total link loss must not exceed calculated specifications; typical values are provided for planning purposes .
• Bend-Insensitive Fibers: Modern multimode fibers (OM3–OM5) often incorporate bend-insensitive technology for improved macro-bending performance, reducing signal loss in tight installations .
• Wavelengths: Standard operation at 850 nm and 1300 nm; suitable for LED, VCSEL, and Fabry-Perot laser sources .
• Core/Cladding: Standard 50 µm core for OM2–OM5, 62.5 µm for OM1, with 125 µm cladding for all types .

Summary

For enterprise and data center applications, OM3, OM4, and OM5 are recommended due to their high bandwidth, laser optimization, and support for 10–100 GbE. OM1 and OM2 remain relevant for legacy networks. Trunk cables should be selected based on attenuation, bend-insensitivity, and link loss requirements, ensuring compliance with EIA and ISO/IEC standards for reliable multimode optical performance .