The duplex LC connector is commonly used in applications where two fibers are needed, such as in data transmission or networking scenarios. The LC connector, known for its small form factor, allows more connections per unit area, making it ideal for high-density applications in telecommunications, data centers, and enterprise. This article explains what Duplex LC connectors are, how they work, the difference between single-mode and multimode use, how to choose and maintain them, and why they remain central to fiber network design. LC stands for Lucent Connector, named after the company that first developed it. Form. An SFP duplex LC connector is a fiber optic interface used in many small form-factor pluggable (SFP) optical transceivers to enable full-duplex optical communication. This article provides an overview of its features.