VIAVI Solutions has introduced its next-generation fiber test head for distributed acoustic sensing (FTH-DAS), expanding the capabilities of its NITRO Fiber Sensing solution. The new FTH-DAS is a true-phase interrogator equipped with an embedded AI and machine learning (ML) engine, designed to deliver advanced sensing, detection, and analytics right at the network edge.
By turning standard optical fibers into continuous sensors, distributed acoustic sensing (DAS) effectively transforms fiber networks into long-range “microphones” capable of detecting and pinpointing disturbances or potential threats.
The technology’s use cases have grown rapidly ranging from monitoring telecom and data center networks to securing borders and critical sites, and even detecting pipeline leaks or wear in undersea power cables.
Built on decades of VIAVI’s historical data, the FTH-DAS applies AI- and ML-based event detection and classification models that continuously learn and adapt over time. All processing runs locally on the device, eliminating the need for external or centralized systems.
This edge-based intelligence enables real-time multi-event detection, localization, and automated classification across multiple fibers with minimal setup or manual intervention. Model updates can be managed automatically through a private or VIAVI-managed cloud environment, ensuring continuous improvement and scalability.
At its core, the FTH-DAS leverages VIAVI’s patented phase-stepping interferometry technique to capture the optical phase from Rayleigh backscatter. This true-phase approach delivers precise, repeatable measurements of physical parameters such as strain, vibration amplitude, and acoustic power not just the presence of events.
The result is more consistent and comparable outputs across deployments, providing a robust foundation for advanced machine learning and long-term performance optimization.
Leadership Comment
“By combining on-device Machine Learning alongside a patented true-phase DAS technique, the VIAVI FTH-DAS delivers the enhanced measurement accuracy and interpretation needed for real-time intelligence,” said Kevin Oliver, Vice President and General Manager, Fiber and Access Solutions, VIAVI. “To put this into context, a gas pipeline operator would not only be able to detect leaks, but also nearby digging, vehicles and even footsteps, with the AI allowing for instantaneous and true alerts to prevent accidental damage before it happens. Classic OTDR, temperature, strain and acoustic monitoring is now possible in a single fiber core for both dark and in-service fiber links.”
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