What primarily affects the quality and attenuation value of a mechanical splice of optical fibers?

The quality of the cleaving tool used can significantly impact the quality and attenuation value of a mechanical splice of optical fibers because a precise and clean cleave is critical for ensuring optimal light transmission between the two fiber ends being joined. When the fibers are cleaved, the cut surfaces must be flat and aligned properly; otherwise, there may be gaps or misalignments that allow some light to escape, leading to increased signal loss or attenuation.

A high-quality cleaving tool will produce the necessary clean and exact cuts that allow for a better interface between the fibers, minimizing scattering and reflection that could compromise the splice's performance. While factors like the condition of the fiber, the environment in which splicing occurs, and the experience of the technician all play roles in the overall effectiveness of the splicing process, the cleaving is a fundamental step with a direct correlation to the splice's eventual quality.