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
flagAustria
0%
33%
16%
50%
12
flagPoland
18%
28%
20%
32%
1100
flagAustralia
35%
21%
14%
28%
14
flagthe United States
16%
11%
44%
27%
18
flagthe United Kingdom
50%
25%
0%
25%
12
flagIndia
23%
30%
23%
23%
13
flagGermany
24%
41%
20%
13%
29