Distinguishing between multimode and
single mode fiber:
The core of a multimode fiber is thicker than that of a
single mode.
Multimode is usually either 50 or 62.5 microns while single mode is
usually 7 to 9 microns. The difference is that with multimode, light
rays may travel the length of the fiber and bounce within the core in
many paths, whereas with single mode, the smaller core allows only rays
perpendicular to the core to be transmitted. Also, a much higher power
laser light source is employed in single mode transmission. Multimode
can use LED's as light sources. Otherwise, both multi- and single mode
fibers have the same diameter cladding:125 microns.ons
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