Method for fusing 2-core sheath fiber and pigtail fiber

Fusion splicing is the recommended method to join a two-core sheath fiber to a pigtail fiber, ensuring minimal signal loss and a durable connection.Preparation

1. Gather Tools and Materials: You will need a fusion splicer, precision fiber cleaver, fiber strippers, lint-free wipes, 99% isopropyl alcohol, and heat-shrink splice protection sleeves .
2. Strip the Fibers: Carefully remove the outer jacket and coating from both the two-core sheath fiber and the pigtail fiber to expose the bare glass cores. Avoid nicking or scratching the fibers .
3. Clean the Fibers: Wipe the exposed cores with IPA-soaked lint-free wipes until they are free of debris and oils .

Cleaving

1. Use a Precision Cleaver: Cleave each fiber end to produce a flat, perpendicular surface. A clean cleave is critical for low-loss fusion .
2. Inspect the Cleave: Under a microscope, ensure the fiber ends are smooth and mirror-like. Any chips or angled surfaces can increase insertion loss .

Fusion Splicing

1. Align the Fibers: Place each fiber in the fusion splicer's V-groove. For a two-core sheath fiber, you may need to splice each core individually to the corresponding pigtail fiber, depending on the splicer's capabilities .
2. Set Splicing Parameters: Use the manufacturer-recommended settings for the fiber type. Multi-core fibers may require adjustments for core spacing and arc intensity .
3. Perform the Fusion: Activate the splicer to generate an electric arc that melts and fuses the fiber ends together. The result should be a continuous glass path with minimal reflection and low insertion loss (typically 0.01–0.05 dB for single-mode fibers), .
4. Inspect the Splice: Most splicers provide a visual or automated inspection to confirm alignment and splice quality .

Protection

1. Apply a Splice Sleeve: Slide a heat-shrink splice protection sleeve over the joint before splicing. After fusion, move the sleeve over the splice and heat it in the splicer's oven to create a rigid, waterproof shield .
2. Handle Carefully: Avoid bending the fiber sharply near the splice. Maintain a bending radius greater than 30 mm to prevent breakage .

Tips for Success

• Work in a Clean Environment: Dust and oils can compromise splice quality .
• Practice on Test Fibers: Especially for multi-core fibers, practice ensures proper alignment and reduces the risk of high-loss splices .
• Follow Manufacturer Guidelines: Each fusion splicer may have specific procedures for multi-core or specialty fibers . By following these steps, you can achieve a reliable, low-loss fusion splice between a two-core sheath fiber and a pigtail fiber suitable for high-performance optical networks .