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Fiber Patch Cables

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Definition: a protected and connectorized fiber-optic cable

German: Faser-Patchkabel

Category: fiber optics and waveguides

How to cite the article; suggest additional literature

Fiber patch cables, also called fiber-optic patch cords, are cables typically containing one or two optical fibers, which are equipped with standardized fiber connectors on both ends. They are generally sold in large quantities, rather than custom-made, although quite special models are also available.

Typically, the used fiber cables have some additional mechanical protection for the fiber(s), e.g. some aramid yarns surrounded by a polymer jacket. The outer diameter is usually several millimeters, i.e., far more than the diameter of the contained fiber, which is e.g. 125 μm. There are also armored fiber cables containing stainless steel tubes.

Path cables are used in many applications:

fiber connector

Figure 1: A fiber connector at the end of a fiber patch cable. The photograph has been kindly provided by NKT Photonics.

A typical length of a fiber patch cable is between 0.5 m and a few meters, but cables with dozens of meters or more are also available.

The actual fiber is usually a glass fiber and sometimes (e.g. for consumer-grade TOSLINK cables) a plastic optical fiber (polymer fiber).

Fiber patch cables are available with a very wide range of fiber connectors; see the corresponding article for an overview on connector types. They can be different types of fiber connectors on the ends, e.g. LC on one end and ST on the other end.

Although some fiber cables can carry extremely high optical powers (e.g. several kilowatts), patch cables are limited to much lower powers – typically a most a few watts, as is sufficient e.g. for telecom applications.

Patch cables can contain different types of optical fiber, e.g. single-mode or multimode telecom fibers – even various specialty fibers. The color of the cable often indicates the type of transmission medium – for example, yellow cables with blue connectors containing single-mode fibers, and orange or gray fibers with black connectors for multimode fibers. Some fiber cables are called “bend-insensitive”, which more precisely means that the used fibers have reduced bend losses for a given bend radius, and a reduced critical bend radius.

Duplex patch cables contain two fibers. Their connectors can have two fiber connections; alternatively, there can be two connectors on each side.

See also: fiber connectors, fiber cables, fiber optics, fibers, telecom fibers
and other articles in the category fiber optics and waveguides

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