Insert the heat shrink tubing before stripping the fiber, position it over the splice, and then heat it to protect and reinforce the joint.

Step-by-Step Guide

1. Slide the Heat Shrink Tubing onto the Cable Before stripping the fiber, slide the heat shrink tubing onto the cable. It is crucial to do this before preparing the fiber ends, as inserting it afterward is not possible without risking damage to the fiber or splice . 2. Strip and Clean the Fiber Carefully remove the outer jacket and buffer coating using precision fiber strippers. Clean the exposed fiber with alcohol wipes to remove any debris or oils, ensuring a smooth surface for splicing . 3. Cleave the Fiber Ends Use a high-quality fiber cleaver to make precise, straight cuts on both fiber ends. Proper cleaving is essential for optimal fusion splicing and minimal signal loss . 4. Perform the Splice Insert the prepared fiber ends into the fusion splicer. The splicer will align the fibers using high-resolution cameras and fuse them with a plasma arc. Verify the alignment and estimated splice loss on the splicer screen . 5. Position the Heat Shrink Tubing After splicing, slide the pre-placed heat shrink tubing so that the splice is centered within the tube. Gently straighten the joint to avoid bending or stress on the fiber . 6. Heat the Tubing Use a splicer's built-in heater or a heat gun to shrink the tubing around the splice. Apply heat evenly until the tubing tightly conforms to the splice, providing mechanical protection and environmental sealing . 7. Organize and Coil Excess Fiber Arrange the fibers systematically in the splice tray to minimize additional loss and prevent breakage. Coil any excess fiber around the largest possible diameter to maintain uniformity and avoid compression . 8. Test the Splice After the tubing has cooled, perform an optical time-domain reflectometer (OTDR) or optical power meter test to ensure the splice is functioning correctly and that optical loss is within acceptable limits . By following these steps, the heat shrink tubing will effectively protect the fiber splice, maintain signal integrity, and ensure durability under environmental stress.