What does OM3-3 mean in fiber optic patch cord

OM3 refers to a type of laser-optimized multimode fiber (LO-MMF) with a 50-micron core, designed for high-speed data transmission over short to medium distances.

Definition and Core Features

OM3 is a multimode fiber (MMF) standard defined by ISO/IEC 11801, optimized for use with vertical-cavity surface-emitting lasers (VCSELs) at an 850 nm wavelength . It has a 50 µm core diameter and a modal bandwidth of 2000 MHz·km, which allows it to support high-speed Ethernet connections efficiently . The fiber jacket is typically aqua-colored, distinguishing it from older OM1 and OM2 fibers .

Performance and Applications

OM3 fiber is designed for 10 Gigabit Ethernet (10G) over distances up to 300 meters, and it can also support 25G Ethernet up to 70 meters and 40G/100G Ethernet up to 100 meters when using MPO connectors . Its laser-optimized design reduces modal dispersion, enabling higher data rates compared to older multimode fibers like OM1 and OM2 . OM3 is widely used in data centers, local area networks (LANs), and storage area networks (SANs) due to its cost-effectiveness and ease of installation .

Comparison with Other Multimode Fibers

• OM1: 62.5 µm core, LED-based, supports 10G Ethernet up to 33 meters.
• OM2: 50 µm core, LED-based, supports 10G Ethernet up to 82 meters.
• OM3: 50 µm core, laser-optimized, supports 10G Ethernet up to 300 meters.
• OM4: 50 µm core, laser-optimized, higher bandwidth (4700 MHz·km), supports 10G Ethernet up to 550 meters.
• OM5: 50 µm core, wideband multimode fiber (WBMMF), optimized for short wavelength division multiplexing (SWDM) to increase data capacity .

Key Advantages

• High-speed support: Optimized for 10G, 25G, 40G, and 100G Ethernet.
• Backward compatibility: Can be integrated with OM1 and OM2 networks.
• Cost-effective: Less expensive than single-mode fiber for short-range connections.
• Reliable for data centers: Supports scalable network requirements and high-bandwidth applications . In summary, OM3 in a fiber optic patch cord indicates a 50 µm laser-optimized multimode fiber capable of high-speed data transmission over moderate distances, making it a standard choice for modern enterprise and data center networks.