LC connectors are the most commonly used fiber optic connectors for modern SFP optical modules, while SC and MPO/MTP connectors are used in legacy or high-density applications.

Recommended Connector Types

LC (Lucent Connector)

• LC connectors are the default choice for most SFP and SFP+ optical modules due to their small form factor (1.25 mm ferrule), which allows high-density connections in data centers and telecom racks .
• They support duplex channels and are easy to connect with a push-pull latch mechanism.
• LC-APC variants are used in PON backbones or test leads where high return loss performance is required . SC (Subscriber Connector / Square Connector)
• SC connectors use a 2.5 mm ferrule and a snap-in square interface.
• They are commonly found in legacy networks, enterprise environments, and FTTH deployments .
• SC connectors are larger than LC connectors and are less suitable for high-density applications but remain compatible with older equipment. MPO/MTP (Multi-Fiber Push-On / Multi-Fiber Termination Push-On)
• MPO/MTP connectors are designed for high-density cabling and multi-fiber connections, often used in 40G, 100G, or 400G optical transceivers .
• They are ideal for parallel optics and backbone connections but are generally not used for standard SFP modules.

Selection Guidelines

1. Check the optical module specification: The module datasheet will indicate the required connector type.
2. Consider network density: Use LC for high-density racks, SC for legacy or lower-density setups, and MPO/MTP for multi-fiber high-speed backbones.
3. Match patch cables: Ensure the fiber patch cable connector matches the module connector to avoid adapters, insertion loss, or operational complexity .
4. Account for single-mode vs multimode: Connector type does not define fiber type, so verify compatibility with single-mode or multimode fiber. In summary, LC connectors are the standard for modern SFP optical modules, SC connectors are used for legacy systems, and MPO/MTP connectors are reserved for high-density, multi-fiber applications. Correct connector selection ensures optimal signal transmission, network reliability, and ease of maintenance .