Multimode fiber optic interfaces commonly use LC, SC, and MTP/MPO connectors paired with LED or VCSEL transceivers such as SFP, SFP+, and QSFP for short-range high-speed applications.

Common Multimode Fiber Interfaces

Connectors:

• LC (Lucent Connector): Small form factor, widely used in data centers and enterprise networks for OM3, OM4, and OM5 fibers.
• SC (Subscriber Connector): Larger connector, often found in older installations using OM1 or OM2 fibers.
• MTP/MPO (Multi-Fiber Push-On): High-density connectors used for parallel optics in 40G, 100G, and 400G multimode links, typically with OM3, OM4, or OM5 fibers. Transceivers:
• SFP (Small Form-factor Pluggable): Supports 1G–10G Ethernet over multimode fiber, compatible with OM1–OM4 depending on distance.
• SFP+: Enhanced version for 10G–25G Ethernet, optimized for OM3/OM4 fibers.
• QSFP/QSFP28: Used for 40G–100G Ethernet, often paired with OM3/OM4/OM5 fibers in data centers.
• SWDM (Short Wavelength Division Multiplexing) Transceivers: Designed for OM5 fiber, allowing multiple wavelengths over a single fiber pair to increase bandwidth.

Fiber Type Compatibility

• OM1 (62.5 µm core): Typically uses LED sources; supports SFP transceivers for 1G Ethernet up to ~275 m and 10G Ethernet up to 33 m. SC or LC connectors are common.
• OM2 (50 µm core): LED-based, supports 1G Ethernet up to 550 m and 10G Ethernet up to 82 m; LC or SC connectors.
• OM3 (50 µm, laser-optimized): VCSEL-compatible, supports 10G–40G Ethernet up to 300 m; LC or MTP/MPO connectors.
• OM4 (50 µm, enhanced laser-optimized): Higher bandwidth than OM3, supports 10G–100G Ethernet over longer distances; LC or MTP/MPO connectors.
• OM5 (50 µm, SWDM-optimized): Supports multiple wavelengths for 40G–400G Ethernet; LC or MTP/MPO connectors with SWDM transceivers.

Practical Considerations

• Short-range applications: Multimode fiber with LC connectors and SFP/SFP+ transceivers is cost-effective for enterprise LANs and data centers.
• High-density or high-speed links: MTP/MPO connectors with QSFP or SWDM transceivers are preferred for 40G–400G deployments.
• Legacy networks: Older OM1/OM2 fibers may still use SC connectors and LED-based transceivers, but are limited in distance and speed. By selecting the appropriate connector type and transceiver for the multimode fiber generation, network engineers can optimize performance, cost, and scalability for short-range optical networks in buildings, campuses, and data centers .