High-Volume Automated MPO Testing with the VIAVI MAP Platform

As hyperscale data centres drive demand for 400G and 800G links, MPO (Multi-Fibre Push-On) connectors have become the industry standard. This case study explores how one manufacturer achieved a 60% production increase by automating MPO verification with the VIAVI MAP-300.

Background

As hyperscale data centres and high-density network deployments expand, the use of MPO connectors has skyrocketed. Each MPO connector can carry 12, 16, or 24 fibres — and emerging configurations for parallel optics demand even tighter performance tolerances.

For one optical cable assembly manufacturer, demand for MPO trunk and breakout cables had increased by more than 60%. Their manual testing process — relying on handheld loss test sets and manual switching — couldn’t keep pace with the volume or ensure consistent accuracy across hundreds of fibre channels.

To maintain production throughput and guarantee compliance with IEC and Telcordia standards, the company invested in an automated MPO test system built around the VIAVI MAP (Modular Automated Platform).

The Challenge: Complexity of Parallel Optics

Testing MPO assemblies presents unique difficulties compared to standard duplex patch cords:

• Each connector contains multiple fibres (12–24), requiring individual measurement of all transmit/receive paths.
• Polarity verification (Type A, B, or C) must be confirmed for every channel.
• Any contamination or high-loss fibre in the array can compromise overall link performance.

Manual testing across 24 channels is slow, repetitive, and error-prone. The engineering team needed a scalable solution to test insertion loss, return loss, and polarity while interfacing with robotic handling equipment.

The Solution: VIAVI MAP-300 Platform

The manufacturer selected the VIAVI MAP-300 chassis as the core of its new test station. It was populated with optical switches, power meters, and light sources configured specifically for multi-fibre parallel testing.

The system was controlled via custom automation software using VIAVI’s open Ethernet API, allowing seamless integration with the factory’s robotic fibre positioning system.

The Automated Workflow:

1. Routing: The MAP system automatically routed optical signals through each fibre channel using high-speed optical switches.
2. Measurement: Light source and power meter modules measured insertion loss for every fibre pair.
3. Verification: Return loss modules verified reflection levels, while sequential illumination checked polarity (Type A/B/C).
4. Data Logging: All measurements were written to a central database with time-stamped records.

The Results

With the MAP-based test system in operation, the manufacturer achieved significant gains:

• Testing time reduced by over 80% — dropping from minutes to seconds per connector.
• Full automation eliminated manual errors and reduced connector wear.
• Measurement repeatability improved, with insertion loss accuracy better than ±0.05 dB.
• Polarity verification automated, ensuring consistent mapping for Type A, B, and C assemblies.
• Comprehensive traceability linked every fibre’s results to product serial numbers.

Engineers could easily scale the system for different MPO formats (12, 16, or 24 fibres) simply by reconfiguring switch matrices within the MAP chassis — no hardware redesign required.

Conclusion

By adopting the VIAVI MAP Platform for automated MPO testing, the manufacturer transformed its test process into a fast, accurate, and fully traceable operation.

The system’s modular architecture provided the flexibility to adapt to evolving MPO standards while maintaining high throughput. Today, the facility tests thousands of multi-fibre assemblies per week with complete confidence in optical performance — delivering the quality required for the next generation of data centre infrastructure.