Developed by Lucent Technologies in the late 1990s, these small form-factor connectors have revolutionized fiber optic connectivity with their compact design and superior performance characteristics. Fiber connector types LC, SC, FC, ST, MTP, and MPO are widely used in past and present. What are the differences between them? Who is the most popular one? Find the answer in the article. The guide covers in depth their features, types, installation techniques, troubleshooting and applications. Whether you're planning an FTTH deployment, upgrading a data center, or working in telecom infrastructure, this guide will help you make informed decisions. LC (Lucent Connector) represents one of the most widely adopted fiber optic connector types in modern telecommunications and data networking infrastructure. Single mode networks have used FC or SC.