When a fiber optic pigtail is properly fusion-spliced, the light remains strong with minimal signal loss, often lower than 0.1 dB per splice.

Impact of Pigtail Splicing on Light

The strength of light after a pigtail splice depends primarily on the quality of the splice. A well-executed fusion splice creates a nearly seamless connection between the pigtail and the main fiber, allowing light to pass through with very low attenuation . If the splice is done correctly, the light remains strong, and the connection can even be stronger than the original fiber due to the protective splice sleeve .

Factors Affecting Light Strength

1. Preparation of Fiber Ends: The fibers must be stripped, cleaned, and cleaved precisely. Any dust, oil, or uneven cleave can create bubbles or dark spots, causing signal loss .
2. Alignment Accuracy: The cores of the fibers must be perfectly aligned in the fusion splicer. Misalignment can reduce light transmission and increase back reflection .
3. Fiber Type and Diameter: Mismatches in core diameter, mode field diameter, or cladding can lead to light leakage and reduced signal strength .
4. Bends and Handling: Sharp bends (macro-bends) near the splice can cause light to escape the core, weakening the signal .

Best Practices for Strong Light Transmission

• Use a high-precision cleaver to ensure a perfect 90-degree cut .
• Clean fibers thoroughly with lint-free wipes and 99% isopropyl alcohol .
• Protect the splice with a heat-shrink sleeve to prevent bending or damage .
• Avoid excessive bending and maintain the minimum bend radius in the splice tray .

Conclusion

If all steps are followed carefully, pigtail splicing does not significantly weaken the light. Fusion splices typically achieve very low insertion loss, maintaining strong signal strength comparable to factory-terminated connections . Poor technique or contamination, however, can lead to noticeable signal degradation.