XYT Super Polishing Process for MTP®/MPO Connectors: PC & APC Polish for Fiber Optic Cable (SM/MM 12/24 Fiber)

XYT Super Polishing Process for MTP®/MPO Connectors: PC & APC Polish for Fiber Optic Cable (SM/MM 12/24 Fiber)

Introduction

The precision polishing of MTP®/MPO connectors is essential for achieving high-performance optical fiber networks. The XYT Super Polishing Process ensures optimal end-face geometry, low insertion loss, and high return loss, meeting the stringent requirements of modern fiber optic systems. This step-by-step polishing method, utilizing XYT's advanced polishing films, guarantees consistent and repeatable results for both PC and APC polishes.

Importance of High-Precision Polishing

The performance of MTP®/MPO connectors heavily depends on the quality of their end-face geometry. Poor polishing can lead to excessive insertion loss, high return loss, and alignment issues. The XYT Super Polishing Process is designed to:

• Improve fiber alignment and contact quality.

• Enhance performance for both Single-Mode (SM) and Multi-Mode (MM) fibers.

• Support 12-fiber and 24-fiber configurations.

• Provide industry-compliant PC (Physical Contact) and APC (Angled Physical Contact) polishing.

Step-by-Step Polishing Process

1st Step: SC15B – Rough Polishing

SC15B is a high-performance diamond lapping film designed for the initial stock removal process. This step efficiently grinds down excess material from the ferrule surface, preparing it for finer polishing.

• Abrasive Type: Diamond

• Grit Size: 15µm

• Purpose: Rapid material removal, surface leveling

• Result: Smooth and uniform ferrule surface

2nd Step: SC3D – Intermediate Polishing

SC3D is a finer diamond lapping film used to refine the surface after the initial rough polish. This step reduces surface roughness and prepares the ferrule for final finishing.

• Abrasive Type: Diamond

• Grit Size: 3µm

• Purpose: Refining the surface, removing scratches from the previous step

• Result: Improved surface smoothness and uniformity

3rd Step: SC1A OR SC1 Flocked Film – Pre-Final Polishing

Depending on the polishing process preference, either SC1A or SC1 Flocked Film is used to further enhance the smoothness of the fiber end face.

• SC1A:

  • Abrasive Type: Silicon Carbide PET

  • Grit Size: 1µm

  • Purpose: Best Geometry, Corp dip and Fiber Height Adjust, Pre-final smoothing, preparing for the ultimate finish

  • Result: Ultra-smooth and well-refined fiber end face

• SC1 Flocked Film:

  • Abrasive Type:  Silicon Carbide Flocked polishing material

  • Grit Size: 1µm

  • Purpose: Best Geometry, Corp dip and Fiber Height Adjust, Enhanced polishing action for optimal surface conditioning

  • Result: Consistent and uniform surface preparation

4th Step: CE0.5B Flocked Film – Final Polishing

The CE0.5B Flocked Film is used for the ultimate final polish, ensuring the highest possible quality finish on the MTP®/MPO fiber end face.

• Abrasive Type: Flocked polishing material with specialized abrasives

• Grit Size: 0.5µm

• Purpose: Final surface finishing, achieving optimal optical performance

• Result: Superior surface quality, high return loss, and low insertion loss

5. End-Face Inspection and Testing

After polishing, each connector undergoes a rigorous inspection using interferometers and video microscopes. Key parameters such as radius of curvature, apex offset, and fiber protrusion are measured to ensure compliance with IEC 61755-3-31 and Telcordia GR-326 standards.

PC vs. APC Polishing

PC Polishing:

• Used for Multi-Mode (MM) and some Single-Mode (SM) applications.

• Achieves a flat-to-curved fiber end face for optimal contact.

• Ensures return loss of at least -40 dB (MM) and -50 dB (SM).

APC Polishing:

• Used primarily for Single-Mode (SM) applications.

• Features an 8-degree angled end face to reduce back reflections.

• Ensures return loss of at least -60 dB.

Benefits of XYT Super Polishing Process

• Exceptional End-Face Geometry: Ensures optimal performance and reliability.

• Low Insertion Loss & High Return Loss: Reduces signal degradation and back reflections.

• Industry-Compliant Polishing Standards: Meets IEC and Telcordia specifications.

• Optimized for Mass Production: Designed for high-volume MTP®/MPO manufacturing.

Conclusion

The XYT Super Polishing Process for MTP®/MPO connectors delivers exceptional performance through a structured, multi-step approach. By using SC15B, SC3D, SC1A/SC1 Flocked Film, and CE0.5B Flocked Film, fiber optic professionals can achieve highly polished, high-performance end faces suitable for both SM and MM fiber applications. This process ensures long-lasting and reliable fiber optic connections in high-speed communication networks.