Bayonet coupling type with 2.5 mm ferrule. Used in multimode networks.
SC
0.3 dB (MM) 0.15 dB (SM)
0.2 dB (MM) 0.25 dB (SM)
Snap-in connector with 2.5 mm ferrule. Used in single-mode systems.
FC
0.3 dB (MM) 0.15 dB (SM)
0.2 dB (MM) 0.25 dB (SM)
Key and screw connector with 2.5 mm ferrule. Typically used in single-mode systems.
LC
0.3 dB (MM) 0.15 dB (SM)
0.2 dB (MM) 0.25 dB (SM)
Small form factor (SFF) connecter with snap-in coupling type and 1.25 mm ferrule. Used where space is limited.
MU
0.3 dB (MM) 0.15 dB (SM)
0.2 dB (MM) 0.25 dB (SM)
Snap-in coupling type with 1.25 mm ferrule. Popular in Japan.
FC/APC**
0.3 dB
0.1 dB
Standard FC connector with angle polish.
* Insertion Loss data from Alliance Fiber Optic Products (AFOP).
** Angle Polished Connectors (APC) are connectors where the ferrule is angled to prevent reflections at the fiber-air interface from being captured by the fiber core.
APC connectors have a green sleeve to differentiate between flat angled finish connectors.