cable news: optical fiber in the light is color?
from：guichao author：admin click： 461 addtime：2017-04-02 09:35:28
the light we see in daily life is called visible light. we often use red, orange, yellow, green, green, indigo and violet to represent different colors of visible light,
the range of visible light is 390 ~760nm, which reflects the different optical frequencies and wavelengths in visible light,
among them, the wavelength of red light is the longest, and the frequency is the lowest. greater than 760nm is infrared light,
less than 390nm part is uv.
so the light used in optical fiber communication is also so colorful?
to answer this question, we need to talk about the scientists' understanding of fiber optics.
as we all know, diving in the deep sea, in addition to wearing a diving suit, but also need to bring a bright enough flashlight,
this is because the deep sea is full of darkness, the outside of the sun here almost disappeared.
in the same way, the transmission of light in the optical fiber is also weakened by the "resistance", but scientists have found a long time,
when the light passes through the optical fiber with three wavelengths of 850nm, 1310nm and 1550nm, the resistance is much smaller than that of other wavelengths,
so today, we use the wavelength of optical fiber communications on these main. obviously, these wavelengths are not within the range of visible light,
they're in the infrared, so we can't see them.
need to be reminded here, if you have the opportunity to contact the optical fiber, do not look at the cross section of the optical fiber,
because the optical fiber in the transmission of the signal, the energy of light is very concentrated, a little attention will burn eyes.