Microbends and macrobends occur when fibers are subjected to uneven pressure or bent beyond their minimum radius, causing light leakage and increased attenuation. Microbends are small-scale distortions, while macrobends involve larger curves that exceed the cable's bend tolerance. Improper handling during installation, tight routing, or coiling fibers too tightly in splice trays can exacerbate these issues. Additionally, mechanical abrasion, crushing, or impacts from construction activities or heavy equipment can physically damage the fiber or protective jacket, leading to splice failure and signal degradation .
Fusion splices and mechanical splices are sensitive to preparation and execution. Common causes of splice damage include:
Splice bundles are vulnerable to moisture, temperature fluctuations, and dust. Water ingress in loose-tube or slotted-core cables can freeze and expand, damaging fibers. Outdoor splicing is particularly sensitive to wind, vibration, and dust, which can disrupt fiber alignment during the splicing process . UV exposure and extreme temperatures can also degrade protective materials over time.
After splicing, improper handling of fiber coils or protective enclosures can increase loss. Fibers must be maintained above the minimum bending radius and secured in splice trays to prevent stress. Residual contaminants trapped under heat-shrink tubes can deform fibers, increasing attenuation . Regular inspection and testing using OTDR, optical power meters, or visual fault locators help identify early signs of splice degradation .
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