Recommended Polishing Process for Fiber Optics

Introduction

Polishing is a critical step in fiber optic connector manufacturing to ensure low insertion loss, high return loss, and optimal optical performance. Precision lapping films coated with diamond, aluminum oxide, silicon carbide, silicon oxide, and cerium oxide abrasives are essential for achieving the required end-face geometry and superior surface quality.

This guide outlines the recommended polishing process for fiber optic connectors, including FC, SC, ST, LC, MU, MTP/MPO, and MTRJ patch cords.

Why is Polishing Important in Fiber Optics?

✅ Minimizes insertion loss (IL) → Ensures efficient light transmission
✅ Maximizes return loss (RL) → Reduces back reflection for stable signal quality
✅ Ensures superior end-face geometry → Avoids fiber damage and performance degradation
✅ Increases connector lifespan → Improves reliability in telecom and data center applications

Recommended Fiber Optic Connector Polishing Process

Step 1: Epoxy Removal (30µm - 15µm Film)

Objective: Remove excess epoxy from the ferrule surface without damaging the fiber.

Recommended Polishing Film:
🔹 Silicon Carbide Film (30µm or 15µm) – Fast epoxy removal for ceramic ferrules.

Process Steps:
✔ Place the connector in a polishing jig.
✔ Use a medium-pressure polishing motion.
✔ Maintain a flat polishing angle to avoid fiber undercutting.

Step 2: Coarse Polishing (9µm - 5µm Film)

Objective: Begin shaping the fiber end-face and remove deep scratches.

Recommended Polishing Film:
🔹 Diamond Lapping Film (9µm or 5µm) – Creates a controlled fiber protrusion.

Process Steps:
✔ Use an orbital polishing machine or hand polishing jig.
✔ Apply light pressure with distilled water to reduce friction.
✔ Inspect under a microscope to check fiber exposure.

Step 3: Fine Polishing (3µm - 1µm Film)

Objective: Smooth the fiber surface and remove any micro-defects.

Recommended Polishing Film:
🔹 Diamond Lapping Film (3µm or 1µm) – Achieves uniform end-face geometry.

Process Steps:
✔ Reduce pressure for finer surface refinement.
✔ Use deionized water or a polishing solution to improve consistency.
✔ Check end-face geometry (radius of curvature, apex offset).

Step 4: Final Polishing (0.5µm - 0.02µm Film)

Objective: Achieve a high-gloss, defect-free fiber surface for optimal optical performance.

Recommended Polishing Film:
🔹 ADS Final Polishing Film (0.02µm) – Ultimate polishing for low insertion loss and high return loss.
🔹 Silicon Oxide / Cerium Oxide Film (0.5µm - 0.02µm) – Eliminates surface imperfections.

Process Steps:
✔ Use a minimal-pressure polishing motion.
✔ Apply a clean, dry polishing technique or use distilled water.
✔ Conduct end-face inspection using an interferometer or 400x microscope.

Polishing Process for Different Fiber Optic Connectors

Key Benefits of Using Precision Polishing Films for Fiber Optics

✅ Consistent Surface Finish → Reduces defects and improves transmission quality
✅ Superior End-Face Geometry → Ensures optimal fiber alignment
✅ Long-Lasting Polishing Performance → Reduces maintenance and production costs
✅ Complies with IEC & Telcordia Standards → Meets global telecom industry requirements

Conclusion

Precision polishing films play a crucial role in fiber optic connector manufacturing, ensuring high-performance signal transmission and low optical loss. By following the recommended polishing process, manufacturers can achieve reliable, long-lasting fiber connections.

For high-quality fiber optic polishing films, contact Shenzhen Xinyutong Optoelectronics Co., Ltd. at sales@xytbrands.com or +86-15702088819.

🚀 Upgrade your fiber optic polishing process with premium films today! 🚀

Let me know if you need further refinements! 👍

Recommended Polishing Process as following: 
- D30 / D9 / D3 / D1 / Final Polishing film (XYT's ADS)

- D15 / D9 / D3 / D1 / Final Polishing film (XYT's ADS)

- D9 / D3 / D1 / Final Polishing film (XYT's ADS)

- D15 / D3 / D1 / Final Polishing film (XYT's ADS)

- D30 / D9 / D1 / Final Polishing film (XYT's ADS)

Ceramic Connector Polishing

What’s more, the life time of XYT Diamond Laping Film is over 30 plates, while XYT's ADS is over 10 plates, which will help you save a great amount of cost.

During the process please use our suggested polish pads, do the cleaning accordingly and set the working time correctly, so you will get the ideal finish for your Ceramic Connectors.

Polishing Process with XYT’s MPO Lapping Film:

1. Step 1: Coarse Polishing – Begin the polishing process with a 15μm film to remove surface imperfections.
2. Step 2: Intermediate Polishing – Refine the surface with a 3μm film for a smoother and more uniform finish.
3. Step 3: Fiber Height Adjustment – Utilize the SC1A Silicon Carbide Film for precise fiber height adjustment, ensuring proper alignment.
4. Step 4: Final Polishing – Achieve a flawless, mirror-like finish using Flocked CE0.5 Film for the final polishing step.