Fiber Connectors

Common Connector Types and Characteristics

FC connectors use a threaded coupling mechanism that provides secure and stable alignment, making them common in laboratory optics and precision measurement systems.

ST connectors use a bayonet-style twist-lock interface that enables quick connection and disconnection in instrumentation and legacy fiber networks.

SC connectors use a push-pull latching mechanism with a 2.5 mm ferrule and are widely used in telecommunications equipment and patch panels.

LC connectors are compact push-pull connectors with a 1.25 mm ferrule designed for high-density fiber connections in telecom and data center applications.

SMA connectors are large-bore threaded connectors commonly used for multimode fibers and fiber bundles in illumination, spectroscopy, and sensing systems.

MPO / MT connectors are multi-fiber connectors that terminate multiple fibers in a single ferrule for high-density parallel optical connections.

 

FC connector — most common for precision optics

FC connector

Why it is common

  • Threaded coupling provides very stable alignment
  • Good resistance to vibration
  • Widely used in lasers, interferometers, spectroscopy, and research laboratories

Typical uses

  • Single-mode patch cables
  • Polarization-maintaining fibers
  • Fiber array fan-outs
  • Laser diode coupling

In many optics laboratories, FC/APC is the default connector type.

SMA connector — dominant for fiber bundles

SMA 905 connector

Why it is common

  • Large bore supports large-core multimode fibers
  • Mechanically robust
  • Simple and cost-effective interface

Typical uses

  • Illumination fiber bundles
  • Spectroscopy probes
  • Medical light guides
  • Optical sensing systems

For fiber cores ≥200 µm, SMA connectors are commonly used.

ST connector — common in instrumentation

ST connector

Why it is used

  • Bayonet-style coupling allows quick connection and disconnection
  • Suitable for repeated connection cycles

Typical uses

  • Test equipment
  • Industrial instrumentation
  • Legacy multimode fiber systems

LC connector — used when compactness matters

LC connector

Why it appears

  • Compact connector design
  • Allows higher connection density

Typical uses

  • Compact photonics modules
  • Instrumentation systems
  • Optical sensing devices

MPO connector — used for fiber arrays

MPO connector

Where it appears

  • Multi-fiber systems
  • Fiber arrays
  • Parallel optical connections

Typical uses

  • Optical engines
  • Silicon photonics testing
  • Fiber array interfaces