25mm ferrule for high-density networks. Fiber Optic connectors are essential components in fiber optic communication systems, allowing for the connection of fiber optic cables to various network devices. Each type of connector has unique characteristics, advantages, and applications. What is a Fiber Connector? The optical fiber connector is a kind of detachable passive optical component used. Of the more than a dozen types of fibre-optic connectors available, the four most commonly used today are LC, SC, FC, and ST. The following guide systematically describes. They are small, often overlooked components, yet they are essential for ensuring high-speed, low-loss, and reliable optical transmission.