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With the development of the Internet and the popularity of computers, television is seldom watched. However, televisions are still one of the household appliances that are indispensable to every family. Most of them are cable television. When watching TV, the phenomenon of "snowflake" is a common occurrence. Sometimes it takes even a long time to recover. This situation generally occurs because of problems with the transmission route. Understand the specific situation of fiber optic cable cable communications for everyone to analyze why this happens.
Here, we do not discuss what effect the external force has on the physical properties of the fiber. Think of the fiber as a plastic water pipe. When you step on it, the water in the pipe slows or even stops. When the fiber is folded to a certain degree, there will be a similar situation where the fiber is under pressure. Obviously, they all have a great relationship with external forces.
One is that the fiber undergoes deformation when it is under pressure . This deformation directly leads to an increase in loss: because the material of the fiber is quartz glass, it has a certain hardness, but under the effect of pressure, its geometrical form will change and cause structural defects. Loss increases.
When this pressure reaches a certain degree, it will also cause permanent damage: In the process of a circuit transformation, there will be sand particles in the heat shrinkable tubing. After the thermal shrinkage, the optical fiber is pressed to gradually increase the welding loss. Large, and after a few months the fiber was completely broken.
The second is that the situation of the fiber bending is a little more complicated: from the interpretation of the electromagnetic field theory, the optical fiber can be approximated as a cylindrical optical waveguide. If this issue is discussed from the perspective of the electromagnetic field theory, it will be very complicated and arduous, but the aforementioned The assumption of the water pipe does not apply here, and it cannot be assumed that the loss of the optical fiber after bending is the water flow in the water pipe, because the water pipe leaks after bending to a certain extent.
When the fiber is bent very much and the bend radius is comparable to the core diameter, its transmission characteristics change. Or, another type of waveguide is no longer suitable for conducting light waves of the original wavelength. When light of the wavelength suitable for the original optical fiber transmission passes through such an optical fiber, a large number of conduction modes are converted into radiation modes and no longer continue to be transported, but enter the cladding to be absorbed by the coating or cladding.