When are optical fiber cables likely to experience microbending?

Microbending occurs in optical fiber cables when the fibers are subjected to tight bends or excessive pressure. This phenomenon is a result of mechanical stresses that distort the fiber's structure, leading to increased attenuation of the light signals passing through. When a fiber optic cable is bent at sharp angles, the slight deformations in the core can cause light to escape, resulting in signal loss.

This is particularly problematic because optical fibers are designed to guide light through internal reflection, and any physical distortion can disrupt this process. The integrity of the fiber's structure is crucial for maintaining optimal performance; hence it is important to avoid tight bends or placing undue pressure on the cables during installation or use.

Other options may contribute to fiber performance issues, but they do not specifically relate to the phenomenon of microbending in the same way that tight angles or pressure do. For example, excessive heat can affect the material properties but does not directly cause microbending, and routine cleaning does not impose mechanical stress. Similarly, while metal conduits provide protection, they can introduce challenges such as compression, but again, they are not the primary cause of microbending itself.