Which bending radius specification applies to optical fiber when installed?

The correct specification for the bending radius of optical fiber when it is installed is based on the principle that the bend radius must be large enough to prevent damage and signal loss in the fiber. In this case, 15 times the internal diameter is frequently referenced to ensure that the optical fiber maintains its integrity under bending conditions.

Optical fibers are sensitive to bending; if they are bent too tightly, it can lead to microbending and macrobending, which can cause signal attenuation or even breakage. Therefore, adhering to a bending radius that is proportionate to the fiber's characteristics is crucial for maintaining performance.

The specification of using 15 times the internal diameter helps to provide a sufficient margin to prevent any undue stress on the fiber. This guideline is commonly accepted in installation and ensures optimal performance while minimizing risk.

In comparison, other options may not provide the necessary buffer to protect the fiber from damage in various installation scenarios. The emphasis on the internal diameter specifically aims to address the fiber’s construction and the impact of bends on performance, leading to the preference for the chosen correct answer.