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SingleMode/MultiMode Fiber
Fiber-optics are made in one of two
forms: SingleMode and MultiMode. MultiMode fiber
has a larger core, and allows hundreds of rays of light to
pass through the fiber at the same time. SingleMode fiber is
much smaller and only allows one ray of light to pass
through. SingleMode fiber maintains integrity over longer
distances. MultiMode fibers used when distance requirements
are 2 km or less. Fiber-Optic cable comes in different diameters.
SingleMode is typically 8-10 um with the outside jacket
measuring 125 um. Contrast this to Multimode, which while retaining
the 125um outer diameter typically has either a 50um or a 62.5um
core. The actual fiber can be made of glass or in
some cases, less expensive plastic. Some MultiMode fiber creators
are offering a core of 125um!
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