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

Infrared
Multimode
Radio
Single mode
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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Answers by country

Infrared
Multimode
Radio
Single mode
answers
flagPoland
19%
30%
22%
27%
823
flagthe United States
7%
15%
53%
23%
13
flagGermany
25%
37%
18%
18%
16