Fiber optic cold splices 55 and 60
Fiber optic cold splices (mechanical splices) like 55 and 60 provide a low-cost, temporary or permanent method to join fibers without fusion, typically differing in sleeve length or fiber compatibility.
Overview of Cold (Mechanical) Splices
Mechanical splicing, also called cold splicing, joins two optical fibers without melting them. The fibers are precisely aligned in a splice sleeve or fixture, often using an index-matching gel to reduce light loss and reflection . Unlike fusion splicing, which permanently fuses fibers with an electric arc, mechanical splices are faster to deploy and require minimal equipment, making them ideal for emergency repairs, field installations, or temporary connections .
Characteristics of 55 and 60 Cold Splices
The numbers "55" and "60" typically refer to splice sleeve lengths in millimeters or specific product models. Key differences include:
- Length and protection: A 60 mm sleeve provides slightly more fiber protection and strain relief than a 55 mm sleeve, which can be important in outdoor or high-stress environments.
- Fiber compatibility: Both types are designed for single-mode or multimode fibers, but the sleeve diameter and internal alignment mechanism may vary slightly to accommodate different fiber coatings or diameters.
- Insertion loss: Mechanical splices generally have 0.2–0.5 dB loss, higher than fusion splices (0.02–0.1 dB), but still acceptable for many field applications .
- Durability: Longer sleeves (like 60 mm) may offer better mechanical stability and environmental protection, reducing the risk of microbending or misalignment over time .
Installation Best Practices
- Clean fibers thoroughly: Use isopropyl alcohol and lint-free wipes to remove dust and oils .
- Precision cleaving: Ensure fiber ends are flat and perpendicular to the axis to minimize insertion loss .
- Proper alignment: Place fibers in the V-groove or mechanical fixture carefully; misalignment increases loss and reflection .
- Use index-matching gel: This reduces Fresnel reflection and improves optical performance .
- Protect the splice: After alignment, encase the splice in the sleeve and secure it to prevent movement or environmental damage .
Applications
- Emergency restoration: Quick repairs in telecom or data networks.
- Temporary connections: During testing or network expansion.
- Field installations: Where fusion splicing equipment is unavailable or impractical.
Summary
55 and 60 fiber optic cold splices are mechanical splices differing mainly in sleeve length and protection. They provide a practical, low-cost solution for joining fibers without fusion, with slightly higher insertion loss but faster deployment. Proper cleaning, cleaving, alignment, and protection are essential to ensure reliable performance .
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