Before starting, ensure proper safety measures: wear industrial safety goggles and cut-resistant gloves to protect against glass shards and burns from the fusion arc, which can exceed 5,000°C. Maintain a clean, static-free workspace using anti-static mats or wrist straps to prevent damage to fibers and splicer electronics .
Remove the outer jacket and protective coatings carefully using a precision stripper. For single-mode fibers, strip 10–20 mm of coating without bending or twisting the fiber to avoid microfractures. Use strippers calibrated for the fiber diameter (typically 250 µm for bare fibers and 900 µm for coated fibers), .
Clean the exposed fiber ends thoroughly with isopropyl alcohol wipes to remove dust, oils, or other contaminants. Even microscopic debris can increase splice loss significantly .
Use a precision fiber cleaver to cut the fiber ends at a 90° angle. Ensure the cleave is flat, perpendicular, and free of chips or cracks. Inspect under a microscope to verify quality, as imperfections can cause insertion loss of 0.1–0.2 dB or more .
Place the cleaved fibers into the fusion splicer's V-grooves, aligning the cores precisely along the centerline. Maintain balanced tension to prevent microbends or breakage. Modern splicers often provide automatic core alignment for high precision .
Activate the splicer to generate an electric arc that melts the fiber ends together. Typical parameters involve a brief arc at high temperature (e.g., 0.5 seconds at 2000°C). This creates a permanent, low-loss joint, often with losses as low as 0.02–0.05 dB .
Slide a protective sleeve over the splice and shrink it using heat to secure the joint. This prevents mechanical damage and maintains fiber integrity. The sleeve typically shrinks in 30 seconds, completing the splice protection .
Use an Optical Time-Domain Reflectometer (OTDR) or similar testing device to verify splice quality and ensure minimal signal loss. Proper testing confirms the splice meets network performance standards .
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