Which connector is commonly associated with fiber optics and has a small design for high-density applications?

The Lucent Connector (LC) is well-known for its compact size and is specifically designed for high-density applications in fiber optic systems. Its small form factor allows for a greater number of connections to be made within a limited space, making it ideal for environments like data centers where space efficiency is a priority.

The LC connector features a push-pull mechanism which simplifies connecting and disconnecting fibers. Additionally, its design supports single-mode and multimode fiber, making it versatile for various network setups.

In contrast, the Straight Tip Connector (ST) is larger and traditionally used for multimode systems, while the Mechanical Transfer Register Jack (MTRJ) also has a smaller design but is less common than the LC. The F-Type Connector is primarily used for coaxial cables in cable television and broadband, rather than fiber optics. Therefore, the identification of the LC as the connector suited for high-density fiber optic applications is well-founded.