How to coil fiber optic cables inside a splice closure

Properly coiling fiber optic cables inside a splice closure involves careful management of fiber length, gentle loops, and organized placement in splice trays to prevent bending stress and ensure long-term reliability.

Preparation Before Coiling

Before coiling, ensure the fiber cables and pigtails are pre-processed: strip the cable jacket, clean the fibers, and prepare the strength members according to the manufacturer's instructions. Calculate the reserved fiber length needed for splicing and future maintenance, as uneven lengths can make coiling difficult and reduce closure efficiency. Heat-shrink sleeves should be applied to spliced fibers to protect the joints.

Coiling Techniques

Single Loop per Splice: After splicing and heat-shrinking, coil each fiber once in the tray or designated groove. This prevents tangling and maintains a tidy layout.

Middle-

First Method: Place the heat-shrunk sleeves in the center of the tray first, then coil fibers on both sides. This method is useful when tray space is limited and helps protect the splices.

End-

First Method: Start coiling from one end of the tray, fix the heat-shrink tube, and then coil the remaining fiber toward the other side. This is faster and allows flexible placement based on fiber length. Special Cases: For fibers that are unusually long or short, coil them separately at the tray ends to avoid sharp bends or stress.

Placement and Securing

Use splice trays or grooves inside the closure to guide the fiber loops and prevent pinching. Avoid sharp bends; maintain a minimum bend radius as specified by the fiber manufacturer. Secure fibers with nylon straps or clips without excessive force to prevent movement while keeping the layout neat.

Stagger layers if multiple fibers are coiled in the same tray to prevent pressure points.

Final Steps

Ensure all fibers are neatly arranged and do not cross over each other unnecessarily. Close the splice tray and the closure carefully, checking that no fibers are pinched or stressed. Follow the closure manufacturer's instructions for sealing and grounding any metallic components.

By following these steps, fiber optic cables inside a splice closure will be organized, protected, and maintain low signal loss, facilitating future maintenance and ensuring network reliability.