By Robie Szyper
Orange: OM1 62.5-Micron Multimode
Orange: OM2 50-Micron Multimode
Aqua: OM3 Laser-Optimized 50-Micron Multimode
Aqua/Violet*: OM4 Laser-Optimized 50-Micron Multimode
Yellow: OS1/OS2 Single-mode
Blue: Polarization-maintaining Single-Mode
Black: Outdoor fiber
*OM4 cable is not specified in the standard. Aqua is used for OM3/OM4 cable (and some higher-grade OM2 cable). Violet is used for OM4 cable in Europe and is becoming more common in North America.
If not specified, jacket colors are the same as for non-military applications.
Bare Fiber Color Coding
When multiple, bare fibers are housed in one buffer tube, the fibers are color coded for identification. This enables installers to easily identify the individual fibers on each end of the link.
Fiber Position Color and Tracer
Fiber Connector Color Coding
Fiber connectors and the connector/strain-relief boot are also color coded, although often the boot colors vary by manufacturer. The following colors are listed in TIA 568-C.3.
Fiber Type Connector Connector/Boot
OM1 62.5-Micron Beige/Black/Aqua Beige
OM2 50-Micron Beige/Black/Aqua Black
OM3 50-Micron Beige/Black/Aqua Aqua
Single-mode Blue Blue
Single-mode APC Green Green
In addition, the fiber connector/strain-relief boots are also color coded to indicate the polish style of the fiber endface. UPC stands for Ultra Physical Contact. APC stands for Angled Physical Contact. The UPC endface is polished at a 0° angle. The APC endface is polished at an 8° angle to prevent light from reflecting and traveling back up the interface. The boot colors may vary by manufacturer.
Connector Boot Endface Fiber Type
Blue UPC Single-mode
Green APC Single-mode
Black UPC OM2 50-Micron
Grey/Beige UPC OM1 62.5 Micron
White UPC OM3 50-Micron