Article Overview
Multimode optical fibers (OM1–OM5) support data rates from 100 Mb/s up to 400 Gb/s over short distances, with standards defined by ISO/IEC 11801 and IEEE 802.3.
Overview of Multimode Fiber Types and Data Rates
Multimode fiber (MMF) is designed for short-distance communication, typically within buildings or campuses, and has a larger core (50–62.5 µm) that allows multiple light modes to propagate . The main types of multimode fiber, standardized under ISO/IEC 11801, are:
- OM1: 62.5 µm core, orange jacket, LED source; supports 100 Mb/s up to 2 km and 10 Gb/s up to 33 m .
- OM2: 50 µm core, orange jacket, LED source; supports 1 Gb/s up to 600 m and 10 Gb/s up to 82 m .
- OM3: 50 µm core, laser-optimized, aqua jacket, VCSEL source; supports 10 Gb/s up to 300 m, 40/100 Gb/s up to 100 m .
- OM4: 50 µm core, laser-optimized, aqua jacket, VCSEL source; supports 10 Gb/s up to 550 m, 40/100 Gb/s up to 150 m .
- OM5: 50 µm core, wideband multimode fiber (WB-MMF), lime green jacket; supports short-wavelength division multiplexing (SWDM) for 40/100/400 Gb/s over 150 m, with modal bandwidth of 4700 MHz·km at 850 nm and 2470 MHz·km at 953 nm .
Key Standards
- ISO/IEC 11801: Defines OM1–OM5 classifications, core size, modal bandwidth, and optical source requirements .
- IEEE 802.3: Specifies Ethernet data rates (10G, 40G, 100G, 400G) and corresponding maximum distances for multimode fiber .
- ITU-T G.651.1: Defines the most widely used forms of multimode optical fiber .
Practical Considerations
- Distance vs. Data Rate: Higher data rates reduce maximum transmission distance due to modal dispersion. For example, OM3 supports 10 Gb/s up to 300 m, but 100 Gb/s only up to 100 m .
- Cost and Deployment: Multimode fiber is less expensive than single-mode fiber for short distances and is widely used in enterprise LANs and data centers .
- Future-Proofing: OM4 and OM5 are recommended for new installations to support high-speed Ethernet and emerging SWDM technologies . In summary, multimode fiber standards define the maximum data rates and distances for each fiber type, with OM3–OM5 being the preferred choice for modern high-speed networks, while OM1 and OM2 remain in legacy installations.
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