How to use fiber array board polishing

Polishing a fiber array board requires precise alignment, sequential use of polishing films with decreasing grit sizes, and careful inspection to achieve high-quality fiber endfaces.

Preparation

1. Cleanliness and Workspace: Ensure the workspace is clean and free of dust. Contaminants can scratch fiber endfaces and reduce optical performance ( ).
2. Mounting the Fiber Array: Load the fiber array into a holder or carrier designed for your polishing system. Secure it firmly to prevent movement during polishing ( ).
3. Reference Setting: Set the reference plane on the polishing board or workholder to ensure uniform pressure and alignment across all fibers ( ).

Polishing Procedure

1. Initial Polishing: Start with a coarse polishing film (e.g., 30 µm diamond grit) to remove excess epoxy and shape the fiber ends ( ).
2. Sequential Grit Reduction: Progressively polish using finer grits: 6 µm, 3 µm, 1 µm, and finally 0.01 µm for the final polish. Each step removes scratches from the previous grit ( ).
3. Polishing Motion: Use a figure-eight motion or circular motion with a polishing puck to ensure even material removal and avoid undercutting ( ).
4. Lubrication: Apply distilled water or a compatible polishing fluid to the film to reduce friction and prevent fiber damage ( ).

Inspection and Quality Control

1. Microscopic Inspection: After each polishing step, inspect the fiber endfaces under a fiber microscope to check for scratches, chips, or uneven surfaces ( ).
2. Endface Geometry: Ensure the endfaces meet the required radius of curvature and apex offset for your application. Automated systems may use interferometry for precise 3D assessment ( ).
3. Re-polishing if Needed: If defects are detected, repeat the polishing steps carefully, starting from the appropriate grit to correct the issue without over-polishing ( ).

Best Practices

• Consistent Pressure: Maintain uniform pressure across all fibers to avoid uneven polishing ( ).
• Consumables: Use high-quality diamond or silicon dioxide polishing films to minimize scratches and prevent undercutting ( ).
• Automated vs Manual: Automated polishing systems provide more consistent results, especially for high-density fiber arrays, but manual polishing is feasible with proper technique ( ).
• Angle or Side Polishing: For specialized applications, angle polishing can reduce back-reflections, and side polishing can expose the fiber core for sensing applications ( ). By following these steps and maintaining precision, cleanliness, and careful inspection, you can achieve high-quality polished fiber array boards suitable for optical connectors, splicing, or photonic devices ( ).