The FC connector is a fiber-optic connector with a threaded body, which was designed for use in high-vibration environments. Among them, FC, SC, ST and LC are applied commonly. Fiber optic cables utilize a few different connectors that can be used to terminate the cable. The connector mechanically orients the fiber cores, allowing light to pass and travel through. What are Fiber Optic Connectors? A fiber optic connector is a mechanical device that allows two fibers to be joined precisely, enabling light to pass with minimal insertion loss and reflection. Ensures low return loss. Understanding fiber connector types—SC/APC, SC/PC, LC/UPC, LC/APC, ST/PC, FC/PC, and FC/APC—is essential for selecting the right interface for your application. The purpose of this guide is to present the most used FC connectors, their.