Common types of multimode fiber include
The main multimode fiber types are OM1, OM2, OM3, OM4, and OM5, each differing in core size, bandwidth, distance, optical source, and typical applications.
Overview of Multimode Fiber (MMF)
Multimode fiber is designed for short-distance data transmission, typically within buildings or campus networks. It has a larger core diameter (50–62.5 µm) than single-mode fiber, allowing multiple light modes to propagate simultaneously. This enables cost-effective use of LED or VCSEL light sources and supports high data rates over short distances, though modal dispersion limits its maximum reach compared to single-mode fiber .
Multimode Fiber Types
| Fiber Type | Core Size | Jacket Color | Optical Source | Max Distance (10G Ethernet) | Typical Use |
|---|---|---|---|---|---|
| OM1 | 62.5 µm | Orange | LED | 33 m | Legacy 100 Mb/s networks, older buildings |
| OM2 | 50 µm | Orange | LED | 82 m | 1 Gb/s Ethernet, limited 10G applications |
| OM3 | 50 µm | Aqua | Laser-optimized (VCSEL) | 300 m | 10G Ethernet, moderate-distance 40G/100G links |
| OM4 | 50 µm | Aqua | Laser-optimized (VCSEL) | 550 m | High-speed 10G/25G/40G/100G, data centers |
| OM5 | 50 µm | Lime Green | Laser-optimized, SWDM | 150 m+ (100G) | Wideband multimode fiber for SWDM, future-proof 100G/200G/400G short-range applications |
Key Differences and Evolution
- Core Size: OM1 has a larger 62.5 µm core; OM2–OM5 use 50 µm cores, reducing modal dispersion and increasing bandwidth .
- Bandwidth: Increases from OM1 (200 MHz·km) to OM5 (28,000 MHz·km for SWDM), supporting higher data rates and longer distances .
- Optical Source: OM1/OM2 use LEDs, limiting speed and distance. OM3–OM5 are laser-optimized for VCSELs, enabling high-speed applications .
- Jacket Color: OM1/OM2 are orange, OM3/OM4 are aqua, and OM5 is lime green to indicate wideband capability .
- Backward Compatibility: OM4 is fully compatible with OM3, allowing upgrades without replacing existing cabling .
- Applications: OM1/OM2 are mostly legacy networks; OM3/OM4 are standard in modern data centers; OM5 is designed for short-wavelength division multiplexing (SWDM) to support multiple wavelengths on a single fiber strand .
Practical Considerations
When selecting multimode fiber, consider: distance requirements, data rate, budget, and future scalability. OM3 and OM4 are widely used today for 10G–100G networks, while OM5 is emerging for high-density, multi-wavelength applications. Proper installation and testing are critical to ensure network reliability and performance .
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