Which of the following is NOT a cause of signal loss in optical fibers?

Optical fibers can experience signal loss due to several factors, but interference from compatible frequencies is not one of them. Signal loss in optical fibers primarily occurs due to physical phenomena that affect the light traveling through the fiber.

Scattering, for example, occurs when light is redirected in various directions as it passes through the fiber material. This phenomenon can lead to some portion of the light not reaching the detector, contributing to signal loss. Macrobends refer to larger curves or bends in the fiber that can cause light to escape from the core, further increasing signal loss.

Crosstalk typically pertains to electrical signals in copper cabling rather than optical fibers; however, in situations where multiple fibers are bundled closely together, it can sometimes refer to unintentional transfer of signals between fibers due to their electromagnetic fields.

Interference, while relevant in other types of signal transmission, specifically in the domain of electrical cables, does not apply to optical fibers in the same way since they rely on light transmission rather than electrical signals. As a result, interference from compatible frequencies is not a recognized cause of signal loss in optical fibers.