What is the grinding sequence for pigtail fiber

The process flow for grinding (polishing) pigtail fibers involves cutting, stripping, epoxy application, curing, polishing, and quality inspection to ensure optimal optical performance.

Step-by-Step Process

1. Material Preparation Start with fiber optic cables and pre-selected connectors. Fiber cables are typically supplied on reels and must be cut to the required lengths using a precision cutting machine to ensure uniformity and minimize fiber damage . 2. Stripping the Fiber Remove the outer jacket using a jacket stripper, which may vary in diameter (e.g., 3.0 mm, 2.0 mm, or 0.9 mm). Then, use a fiber miller stripper to remove the tight-buffered inner coating, exposing the bare fiber core . 3. Epoxy Application and Connector Insertion Apply a specialized epoxy (commonly 353 epoxy) to the ferrule of the connector. Insert the stripped fiber into the ferrule carefully, either manually or using automated machinery, ensuring proper alignment . 4. Curing the Epoxy Solidify the epoxy using a vertical or horizontal solidification furnace. This step ensures the fiber is securely bonded within the connector ferrule . 5. Polishing the Fiber End Polish the connector end to achieve a smooth, flat, or angled surface depending on the connector type (e.g., PC, UPC, APC). Polishing removes excess epoxy and aligns the fiber core with the ferrule to minimize insertion loss and back reflection . 6. Cleaning and Inspection Clean the polished connector using an ultrasonic cleaning machine. Inspect the fiber end under a microscope (400x–600x) to ensure the fiber is centered and free of dust or scratches. Re-clean if necessary . 7. Testing and Quality Control Perform functional tests, including insertion loss and return loss measurements, to verify optical performance. Only pigtails meeting the required specifications proceed to final assembly . 8. Final Assembly Assemble any additional connector components and prepare the pigtail for packaging and shipment. The bare fiber end remains ready for field splicing, either by fusion or mechanical methods .

Notes on Splicing

The bare fiber end of a pigtail is designed for fusion or mechanical splicing to the main fiber cable. Fusion splicing provides a seamless, low-loss connection, while mechanical splicing is faster but may have slightly higher insertion loss . This workflow ensures that fiber pigtails deliver factory-grade connector quality while remaining flexible for field termination, optimizing both performance and installation efficiency.