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How to splice multimode pigtails

How to splice multimode pigtails

How to splice multimode pigtails - BENNIE OPTICAL [PDF]

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Splicing multimode fiber pigtails involves carefully preparing the fiber, aligning it with the pigtail, and using either fusion or mechanical splicing to create a low-loss, durable connection.

Tools and Materials Needed

To splice multimode pigtails effectively, you will need:

Fusion Splicer: Uses an electric arc to fuse the fiber ends into a continuous optical path.
Fiber Strippers: Specialized tools to remove the outer jacket and coating without damaging the glass core.
High-Precision Cleaver: Ensures a perfect 90-degree cut for seamless fusion.
Cleaning Supplies: Lint-free wipes and 99% isopropyl alcohol to remove debris and oils.
Heat-Shrink Splice Protection Sleeves: Protects the fragile splice after fusion .

Step-by-Step Fusion Splicing Procedure

Prepare the Fiber: Strip the outer jacket and coating from both the multimode pigtail and the incoming fiber. Clean the exposed glass until it “squeaks” when wiped with alcohol .
Cleave the Fiber: Use a precision cleaver to create a flat, perpendicular end on both fibers. This ensures minimal signal loss during fusion .
Insert Splice Protection Sleeve: Slide a heat-shrink sleeve onto the pigtail before splicing to protect the joint afterward .
Align and Fuse: Place the fibers in the fusion splicer. The machine aligns the cores and melts them together using an electric arc, forming a continuous optical path .
Protect the Splice: Slide the heat-shrink sleeve over the fused joint and activate the splicer's internal oven to shrink and secure the sleeve .
Test the Connection: Use an optical power meter or OTDR to verify low insertion loss and proper signal transmission .

Mechanical Splicing Option

Mechanical splicing is an alternative when fusion splicing is not available. It involves:

Aligning the pigtail and fiber in a precision mechanical holder.
Using index-matching gel to reduce signal loss.
Securing the assembly in a splice tray for protection .

Multimode Considerations

Fiber Type: Multimode pigtails typically use 50/125 µm or 62.5/125 µm fibers, with OM3/OM4 types for 10G networks.
Connector Color: Standard multimode pigtails are orange (OM1/OM2) or aqua (OM3/OM4) to distinguish them from single-mode yellow pigtails .
Alignment Sensitivity: Multimode fibers are less sensitive to core alignment than single-mode, but careful cleaving and cleaning are still critical to minimize loss .

Best Practices

Always use high-quality tools and clean fibers to prevent contamination.
Avoid bending the fiber near the splice; multimode fibers are fragile at the junction.
Order slightly longer pigtails to allow slack for adjustments or re-splicing .
Label and organize pigtails in splice trays to maintain network integrity . By following these steps and precautions, you can achieve reliable, low-loss splices for multimode fiber pigtails suitable for data centers, LANs, or FTTH deployments.

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