Sorting Rules for Multimode Fiber Types
Multimode fibers are classified into OM1, OM2, OM3, OM4, and OM5 based on core size, bandwidth, maximum distance, optical source, and application suitability.
Overview of Multimode Fiber
Multimode fiber (MMF) has a larger core diameter (50–62.5 µm) than single-mode fiber, allowing multiple light modes to propagate simultaneously. This makes MMF ideal for short- to medium-range applications, such as within buildings, campuses, or data centers, using lower-cost optical sources like LEDs or VCSELs . The ISO/IEC 11801 standard defines the five generations of multimode fiber: OM1, OM2, OM3, OM4, and OM5 .
Classification of Multimode Fiber Types
| Fiber Type | Core Size | Optical Source | Jacket Color | Bandwidth / Modal Bandwidth | Max Distance (10G Ethernet) | Typical Applications |
|---|---|---|---|---|---|---|
| OM1 | 62.5 µm | LED | Orange | 200 MHz·km at 850 nm | 33 m | Legacy 100 Mb/s to 1 Gb/s LANs |
| OM2 | 50 µm | LED | Orange | 500 MHz·km at 850 nm | 82 m | 1 Gb/s Ethernet, limited 10G |
| OM3 | 50 µm | VCSEL (Laser-Optimized) | Aqua | 2000 MHz·km at 850 nm | 300 m | 10G Ethernet, 40G/100G short-range |
| OM4 | 50 µm | VCSEL (Enhanced Laser-Optimized) | Aqua | 4700 MHz·km at 850 nm | 550 m | 10G/25G/40G/100G Ethernet, data centers |
| OM5 | 50 µm | SWDM (Short-Wavelength Division Multiplexing) | Lime Green | 4700 MHz·km at 850 nm, 2470 MHz·km at 953 nm | 150 m+ at 100G | High-speed, multi-wavelength data center applications, future-proofing for 400G+ |
Key Points
- OM1 and OM2 are legacy fibers, primarily using LED sources, suitable for older networks and lower-speed applications .
- OM3 and OM4 are laser-optimized fibers using VCSELs, supporting higher bandwidth and longer distances, making them the mainstream choice for modern enterprise and data center networks .
- OM5 is designed for wideband SWDM, allowing multiple wavelengths to transmit simultaneously, enhancing scalability for high-speed short-range applications, though adoption is still growing due to cost and module availability .
- Jacket color coding helps identify fiber type: OM1/OM2 (orange), OM3/OM4 (aqua), OM5 (lime green), .
- Backward compatibility: OM4 is compatible with OM3, but OM5 requires SWDM-capable transceivers to utilize its full potential .
Practical Considerations
When selecting multimode fiber, consider:
- Distance and data rate requirements: OM3/OM4 for 10G–100G, OM5 for future 400G+ short-range networks.
- Budget constraints: OM1/OM2 are cheaper but limited in performance.
- Optical source compatibility: Ensure transceivers match fiber type (LED vs VCSEL vs SWDM).
- Future-proofing: OM5 offers scalability for multi-wavelength applications, ideal for high-density data centers . Understanding these classifications ensures cost-effective, reliable, and scalable network design for enterprise and data center environments.
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