Single Mode

 

An optical fiber in which the signal travels in one mode (path). It typically has an 8-10 µm core within a 125 µm cladding.

      Used for high-speed transmission over long distances, it provides greater bandwidth than multimode, but its smaller core makes it more difficult to couple the light source. Increasingly, singlemode fiber is used for shorter distances. When singlemode fiber is used in shorter distances, such as a campus or metropolitan area network (MAN), step-index fiber is used. For longer distances and for transmitting multiple channels (WDM), dispersion-shifted fiber is used.

 

Typically yellow outer jacketing.

Multimode

An optical fiber in which light travels in multiple modes.

An optical fiber with a larger core than singlemode fiber. It is the most commonly used fiber for short distances such as LANs. Light can enter the core at different angles, making it easier to connect the light source to broader light sources such as LEDs. However, light rays travel down multiple reflective paths (modes) in multimode fiber, causing modal dispersion, which is a broadening of the pulses at the receiving end. Also available in 50 µm core Diameters.

 

62.5 µm typically Orange or Grey outer jacketing while 50 µm is typically Aqua in color.

Fiber Modes

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