Requirements for stripping length of optical cable splices

The typical stripping length for optical fiber splices ranges from 10 mm to 20 mm, depending on the splice type and equipment used.

Recommended Stripping Length

For both fusion and mechanical splices, the optical fiber coating must be removed to expose the bare glass for proper alignment and low-loss connection. Industry practice and ITU-T splicing guidelines suggest:

• Fusion splicing: 10–16 mm of bare fiber is commonly stripped to allow proper insertion into the fusion splicer's V-groove or clamps and to accommodate fiber cleaving and protection sleeve placement .
• Mechanical splicing: 12–20 mm is typical, depending on the splice holder design and whether index-matching gel or sleeve is used .
• Ribbon fiber splicing: Stripping length may be slightly longer (15–20 mm) to allow simultaneous alignment of multiple fibers in mass fusion splicing .

Factors Affecting Stripping Length

1. Splice type: Fusion splices generally require slightly shorter stripping lengths than mechanical splices due to precise alignment in the splicer .
2. Fiber type: Single-mode fibers often require more precise stripping and cleaving than multimode fibers to minimize splice loss .
3. Protection sleeve size: The stripped fiber must fit inside the splice protection sleeve without leaving excess bare fiber exposed, which could compromise mechanical strength .
4. Environmental conditions: In outdoor or high-stress installations, slightly longer stripping lengths may be used to ensure proper sleeve coverage and tensile strength .

Best Practices

• Use a precision fiber stripper to avoid nicking or damaging the glass.
• Ensure the stripped fiber is clean and free of debris before splicing.
• Follow the splicer manufacturer's recommended stripping length, as it may vary slightly depending on the model and fiber type.
• After splicing, always inspect the splice for proper alignment and minimal loss using an OTDR or optical power meter .

Summary

While ITU-T Recommendations L.12 and L.400/L.12 emphasize high-quality, low-loss, and stable splices, the practical stripping length for optical fiber splices is generally 10–20 mm, adjusted according to splice type, fiber type, and protection sleeve requirements. Proper stripping ensures reliable splices, optimal optical performance, and long-term stability of the fiber network.