1. ST (Straight Tip): ST connectors use a bayonet coupling and are commonly used in networking and telecommunications applications.

2. SC (Subscriber Connector): SC connectors feature a push-pull coupling mechanism and are widely used in data center and telecommunications environments.

3. LC (Lucent Connector): LC connectors are small, featuring a snap-in design. They are popular in high-density environments like data centers.

4. MTP/MPO (Multiple-Fiber Push-On/Pull-Off): MTP/MPO connectors are used for multiple fibers in a single connector, making them suitable for high-density applications, such as in data centers for parallel optic connections.

5. MT-RJ (Mechanical Transfer-Registered Jack): MT-RJ connectors have two fibers in a single small form factor, making them suitable for duplex connections in limited space.

6. FC (Fiber Connector): FC connectors use a screw-on coupling mechanism and are common in older installations or high-vibration environments.

7. SMA (SubMiniature version A): SMA connectors are commonly used in industrial and military applications.

8. BNC (Bayonet Neill–Concelman): BNC connectors are commonly used for coaxial cables but are also adapted for some fiber optic applications.

Each connector type serves specific purposes and is chosen based on factors like application requirements, available space, and the type of optical fiber being used.