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Fiber Optic Connectors Overview

Sep 2, 2025

Overview

This lecture covers the main types of fiber optic connectors, their features, locking mechanisms, and common usage scenarios in networking environments.

Common Fiber Optic Connectors

  • Fiber optic connectors must match the connection type for proper installation and operation.
  • SC (Subscriber Connector) is a common square-shaped fiber connector with a locking mechanism.
  • The SC connector locks by snapping in place and requires pulling to remove.
  • SC connectors are often paired for separate transmit and receive fibers in data centers.
  • LC (Local Connector) is smaller than SC, features a top clip for locking, and is also known as the Lucent or Little Connector.
  • LC connectors can be paired for transmit and receive, and are removed by pressing the clip.
  • ST (Straight Tip) connectors use a bayonet locking system—push in, twist to lock, reverse twist to remove.
  • ST connectors have a protective ferrule and are less likely to be accidentally disconnected.
  • Different connectors use various locking mechanisms to prevent accidental disconnection in dense environments.

High-Density Fiber Connector

  • MTP/MPO (Multi-fiber Push-On) connectors can house 12 fibers in one connection for higher density.
  • MTP connectors lock similarly to SC (push in to lock, pull out to release).
  • MTP is also referred to as MPO, with the MTP name used by Corning.
  • MTP connectors allow for increased fiber capacity in smaller physical space.

Key Terms & Definitions

  • SC Connector — Subscriber Connector, square-shaped, push-pull lock, supports single fibers, often paired for TX/RX.
  • LC Connector — Local/Lucent/Little Connector, smaller form, top clip lock, often paired for TX/RX.
  • ST Connector — Straight Tip Connector, bayonet style, twist-lock mechanism.
  • MTP/MPO Connector — Multi-fiber Push-On, supports 12 fibers, high-density, push-pull lock.

Action Items / Next Steps

  • Review connector types and their locking mechanisms for lab practice or installation.
  • Identify connectors by appearance and function in future practical sessions.

Full transcript