Fiber is already the nervous system of the digital economy. It carries our calls, video streams, cloud traffic, financial transactions and AI workloads across continents and under oceans. But what if those same strands of glass could also feel what’s happening around them?

That’s the possibility emerging from distributed fiber sensing. By reading subtle changes due to vibration, strain, temperature and acoustic activity, optical fiber can act as a continuous sensing layer across vast distances. The network begins to understand the places it connects, helping operators detect events, monitor assets and respond to risk with greater precision, while improving the safety and resilience of critical infrastructure.

At ECOC 2026, our teams and collaborators are contributing multiple papers that explore this shift. Vishal Rai and colleagues will share work on combining communication and sensing without compromising data performance. Konstantinos Alexoudis and collaborators will present research into power-grid and subsea sensing, while Tjorven Hilbert and colleagues will show how fiber sensing can support localization and battery monitoring. 

Together, the papers show how fiber sensing is moving far beyond traditional link assurance and becoming a practical tool for infrastructure awareness. As this data scales, combining sensing with analytics will be key to turning raw signals into actionable insight.

From fault detection to physical awareness

Operators already use fiber monitoring to detect faults and measure performance. That remains essential. But distributed sensing changes the question. Instead of asking only “is the fiber working?”, operators can begin to ask “what’s happening along the fiber?”

That could mean detecting vibration from machinery or traffic, measuring strain on a power line, monitoring environmental forces on a subsea cable or identifying the early signs of overheating in a battery system. Across these use cases, fiber takes on a wider role. It becomes a sensing platform that can span vast distances and reach environments where traditional monitoring is difficult or expensive to deploy.

Sensing without sacrificing performance

One of the key challenges is whether sensing can happen without disrupting communications. Adtran’s ECOC work on joint communication and acoustic sensing addresses this directly. Using a modified special coding, the research shows how interspatial crosstalk in the sensing signal can be significantly reduced. Furthermore, the co-directional propagation of this enhanced sensing signal shows minimal impact on data transmission performance, addressing a key challenge associated with legacy sensing signals.

That’s key because connectivity and visibility are beginning to converge, bringing network performance and real-world awareness into a single operational view. Fiber networks must continue moving more data than ever, while also becoming more responsive to the infrastructure they support and the environments they pass through.

Connectivity and visibility are converging, bringing network performance and real-world awareness into a single operational view.

Some of the most compelling possibilities emerge in the power grid. Optical ground wires, already deployed on high-voltage transmission lines, contain fiber that can be used as a continuous sensing layer. 

In another ECOC paper, Adtran researchers and partners outline how distributed sensing was used to monitor live maintenance on a 110-kV transmission line. During a crane-based lifting sequence, the system followed cable movement in real time, identified mechanical events such as chain collisions and revealed residual strain left after the work was complete.

For grid operators, that opens up a powerful idea: networks that can verify maintenance activity remotely and provide insight into the mechanical condition of assets, without relying solely on manual reporting.

Networks that know where they are

Another practical challenge in fiber networks is localization. An operator can often determine the distance to an issue along a fiber with high precision, but translating that into a real-world location isn’t always straightforward.

Another ECOC paper from our team explores how sensing signatures can identify physical reference points along a fiber route. These might include cabinets, road crossings or nearby infrastructure, each leaving a distinctive pattern in the data. By linking those signatures to real-world locations, the network becomes far more aware of its surroundings. That means faster fault resolution, improved asset records and more precise data-driven operations.

From seabeds to battery racks

The same sensing principles extend into very different environments. In related research alongside our partners, we’ve explored multi-modal sensing on a long subsea cable, observing how it responds to changing environmental conditions such as storms. Different sensing techniques provide different perspectives, from localized vibration to broader strain patterns, creating a more complete picture of how the cable behaves.

At the other end of the spectrum, similar techniques are being applied to battery energy storage systems. By placing fiber across battery surfaces, researchers have shown how localized hotspots could be detected early, even when they affect only a small part of the system. This could open up valuable safety capabilities in environments such as data centers and renewable energy storage sites.

These use cases may look worlds apart, but they share the same foundation: fiber as a distributed sensing platform.

A new layer of infrastructure intelligence

The real story is the emergence of fiber networks as a source of infrastructure intelligence. A single fiber route could one day detect events, classify activity, measure strain, monitor temperature and improve localization, all while continuing to carry high-capacity traffic.

Because fiber is already deployed across power grids, cities, transport corridors, subsea routes and data center environments, it offers something unique: continuous visibility over distance, without the need to install large numbers of individual sensors.

With fiber already deployed across critical infrastructure worldwide, the opportunity now is not access, but how effectively that data is used. 

There’s still work to do. Different applications require different sensing approaches, and integrating sensing into operational workflows and network management systems will be essential to unlock its full value. Yet the direction is clear, and the growing body of research we’re presenting at ECOC is accelerating that momentum. 

Fiber will continue to connect the world. Increasingly, it will also help operators understand it, protect it and act on what it reveals.