Fusion & Mechanical Splicing
Fusion splicer operation, mechanical splice installation, Fresnel reflection, index-matching gel, splice protection, and enclosures.
- Describe the fusion splicing process and typical loss targets
- Explain mechanical splicing and the role of index-matching gel
- Define Fresnel reflection and its impact on splice performance
- Identify splice protection methods including sleeves and trays
- Compare fusion and mechanical splice characteristics
Lección 1
Fusion Splicing - Equipment, Process & Loss Targets
What Is Fusion Splicing?
Fusion splicing permanently joins two fiber ends by melting (fusing) them together with an electric arc. A fusion splicer uses precision alignment and a controlled electric discharge to heat the fiber tips to approximately 2000 degrees C, causing the glass to flow together into a continuous strand.
Fusion splicing produces the lowest loss permanent splice - typically 0.02 to 0.05 dB for singlemode fiber with a modern core-alignment splicer. This is less loss than any mechanical splice or connector pair.
The Fusion Splicing Process
- Strip buffer/coating from both fibers (expose bare glass)
- Clean bare fiber with isopropyl alcohol
- Cleave both fibers with a precision cleaver
- Load fibers into the splicer's fiber holders
- Align - the splicer automatically aligns the fiber cores
- Arc - electric discharge fuses the fibers together
- Estimate loss - the splicer displays estimated splice loss
- Protect - slide heat-shrink splice protector over the splice and cure
Why Use Fusion Over Mechanical?
Fusion splicing is preferred over mechanical splicing when:
- Lowest possible loss is required (long-haul, high-speed links)
- Permanent installation where the splice will not be re-done
- High fiber count cables where cumulative splice loss matters
- Singlemode fiber where alignment precision is critical
Fusion splicing produces the lowest loss permanent splice (typically 0.02 - 0.05 dB for singlemode). The process involves stripping, cleaving, automatic alignment, arc fusion, and heat-shrink protection. It is preferred over mechanical splicing for performance-critical applications.