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
12%
20%
16%
52%
25
flagthe United States
8%
14%
32%
44%
34
flagPoland
19%
29%
20%
30%
1231
flagthe United Kingdom
38%
23%
9%
28%
21
flagAustralia
35%
21%
14%
28%
14
flagIndia
25%
37%
18%
18%
16
flagGermany
21%
45%
20%
12%
55