Quiz Entry - updated: 2026.07.14
What are the four common types of fiber-optic connectors?
ST (straight-tip), SC (subscriber connector), LC (Lucent connector), and duplex multimode LC.
* ST (bayonet twist), SC (square push-pull), LC (small, dense), and Duplex LC (two LC joined for TX + RX). *
| Connector | Name | Characteristics |
|---|---|---|
| ST | Straight-Tip | Bayonet-style twist lock; older style |
| SC | Subscriber Connector | Square shape; push-pull mechanism |
| LC | Lucent Connector | Smaller form factor; popular for dense applications |
| Duplex LC | Duplex Multimode LC | Two LC connectors joined; for bidirectional transmission |
Tip: A fiber connection always requires two fibers - one for transmit (TX), one for receive (RX).
Go deeper:
Optical fiber connector — Wikipedia — ST, SC, and LC connector families, mating mechanisms, and how LC came to dominate.