1. Poor Cleaving A precise cleave is essential for a successful splice. Angled, chipped, or uneven cleaves prevent proper core alignment, leading to high insertion loss. Common issues include jagged edges, cleave angles not at 90°, and worn cleaver blades. Regular maintenance of cleaving tools and careful handling of fibers can prevent these problems . 2. Contamination and Dirty Fiber Ends Dust, oil, or residue on fiber ends can block light transmission, cause microbubbles, or even result in complete splice rejection. Contamination often comes from touching fibers with bare hands, dusty environments, or unclean fiber holders. Cleaning fibers with isopropyl alcohol and lint-free wipes before splicing is critical . 3. Misalignment Incorrect positioning of fibers during splicing can cause light leakage and signal loss. Misalignment may result from operator error, poor handling, or vibration during the splicing process. Proper alignment using high-quality splicing equipment and verification with tools like OTDRs helps reduce this risk . 4. Core Diameter or Fiber Type Mismatch Joining fibers with different core diameters or incompatible types can lead to significant splice loss. Even slight variations in fiber refractive index or core size can reduce light transfer efficiency. Ensuring fiber compatibility and using appropriate splicing techniques is essential . 5. Hollow, Cracked, or Damaged Fibers Fibers may appear intact externally but have internal defects such as cracks or hollows, which compromise splice quality. These defects can be caused during manufacturing, handling, or installation . 6. Equipment and Environmental Factors Worn or contaminated electrodes in fusion splicers, unstable arcs, wind, dust, vibration, or temperature fluctuations can disrupt splicing. Outdoor splicing requires protective tents or enclosures to maintain alignment and prevent moisture infiltration, especially in freeze-thaw conditions . 7. Improper Splice Protection and Routing Mechanical stress, subtle bends, or pressure from buried cables can distort optical paths, leading to long-term performance degradation. Using protective tubing and proper routing techniques helps maintain splice integrity .
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