In case of fiber-optic cables, which transmission mode is used for transmitting data over long distances?

Infrared
52
Multimode
85
Radio
54
Single mode
62
In fiber-optic communication, a single-mode optical fiber (SMF) is an optical fiber designed to carry light only directly down the fiber - the transverse mode. These modes define the way the wave travels through space, i.e. how the wave is distributed in space.
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