1. Fiber Breakage and Physical Damage Fiber breakage can occur due to improper handling, external forces, or stress on the cable. In splice boxes, loose fibers may be squeezed or crushed, and improper storage or twisting can lead to microbending or macro-bending, causing increased attenuation or complete fiber breakage . Direct physical damage, such as pinching, crushing, or accidental cuts, also results in signal loss . 2. Bending Loss Bending losses occur when fibers are bent beyond their minimum radius. Macro-bending involves large-radius bends, while micro-bending results from small perturbations or stress during installation. These bends cause light leakage from the core, increasing attenuation, especially at longer wavelengths like 1550 nm . 3. Splice and Connector Loss Splice loss arises at fiber joints due to misalignment, poor fusion, or end-face defects. Connector issues, such as contamination from dust, oil, or improper cleaning, can lead to intermittent errors, high insertion loss, or unusual reflectance. Mating incompatible connectors (e.g., UPC to APC) or poor ferrule flatness also increases loss . 4. Signal Attenuation Attenuation is the reduction of optical power along the fiber, caused by intrinsic factors (absorption, scattering, dispersion) and extrinsic factors (bending, splicing, connector defects). Excessive attenuation weakens the signal and may cause network instability . 5. Environmental and Power-Related Issues Unstable power supply, overheating, or poor airflow in racks can cause intermittent connectivity. Loose cables or improper fixation can lead to fiber displacement, twisting, or bending, further increasing attenuation .
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