The buffer or jacket on patchcords is often color-coded to indicate the type of fiber used. The strain relief “boot” that protects the fiber from bending at a connector is color-coded to indicate the type of connection. Connectors with a plastic shell (such as SC connectors) typically use a color-coded shell. Standard color codings for jackets (or buffers) and boots (or connector shells) are shown below:
|Orange||multi-mode optical fiber|
|Aqua||OM3 or OM4 10 G laser-optimized 50/125 µm multi-mode optical fiber|
||OM4 multi-mode optical fiber (some vendors)
||OM5 10 G wideband 50/125 µm multi-mode optical fiber|
|Grey||outdated color code for multi-mode optical fiber|
|Yellow||single-mode optical fiber|
|Blue||Sometimes used to designate polarization-maintaining optical fiber|
|Blue||Physical contact (PC), 0°||mostly used for single mode fibers; some manufacturers use this for polarization-maintaining optical fiber.|
|Green||Angle polished (APC), 8°|
|Black||Physical contact (PC), 0°|
|Grey||Physical contact (PC), 0°||multimode fiber connectors|
|White||Physical contact (PC), 0°|
|Red||High optical power. Sometimes used to connect external pump lasers or Raman pumps.|
Remark: It is also possible that a small part of a connector is additionally color-coded, e.g. the lever of an E-2000 connector or a frame of an adapter. This additional colour coding indicates the correct port for a patchcord, if many patchcords are installed at one point.
Individual fibers in a multi-fiber cable are often distinguished from one another by color-coded jackets or buffers on each fiber. The identification scheme used by Corning Cable Systems is based on EIA/TIA-598, “Optical Fiber Cable Color Coding.” EIA/TIA-598 defines identification schemes for fibers, buffered fibers, fiber units, and groups of fiber units within outside plant and premises optical fiber cables. This standard allows for fiber units to be identified by means of a printed legend. This method can be used for identification of fiber ribbons and fiber subunits. The legend will contain a corresponding printed numerical position number or color for use in identification.
The colour code used above resembles PE copper cables used in standard telephone wiring.
In the UK the colour codes for COF200 and 201 are different. Each 12 fibre bundle or element within a Cable Optical Fibre 200/201 cable is coloured as follows:
Each element is in a tube within the cable (not a blown fibre tube) The cable elements start with the red tube and are counted around the cable to the green tube. Active elements are in white tubes and yellow fillers or dummies are laid in the cable to fill it out depending on how many fibres and units exists – can be up to 276 fibres or 23 elements for external cable and 144 fibres or 12 elements for internal. The cable has a central strength member normally made from fiberglass or plastic. There is also a copper conductor in external cables.
Post time: Aug-20-2019