When fiber starts listening in research and education networks

Research and education (R&E) networks are built to transport massive volumes of scientific data between universities, laboratories, supercomputing centers, instruments and cloud platforms. But the optical fibers that carry the data can provide value beyond transport. 

In September 2026, a construction crew accidentally cut a backup fiber optic cable used for air traffic control systems, causing widespread flight delays in the US. Their error was detected only after the main air traffic control systems failed. 

This didn’t need to happen because the threat could have been detected before the cable was physically damaged. By choosing the right technologies, network operators can turn fibers into distributed sensors that proactively protect the network’s physical infrastructure. For R&E network operators, this can also create new opportunities for collaboration.

From fiber monitoring to fiber sensing

Growing data traffic, emerging high-performance computing applications and AI are all prompting R&E network operators to deploy advanced optical transport that depends on coherent detection and digital signal processors (DSPs). These technologies provide performance, capacity and reach enhancements that can meet the tough demands of the research community. 

Advanced coherent optics and DSPs offer another valuable capability: They can analyze disruptions to light within deployed fiber cables to detect, locate and characterize physical events along terrestrial and subsea routes. These capabilities are far more advanced than conventional fiber monitoring, which provides limited information about problems after they occur. Fiber sensing provides specific, real-time insights about what’s happening in and around the fiber plant.

Systems that combine coherent detection, powerful DSPs and AI help R&E network operators uncover, pinpoint and identify subtle changes associated with anomalous events that could put their fiber cables at risk. These include vibration, strain, cable movement, construction, component degradation, environmental and temperature changes. Operators can use insights from fiber sensing to mitigate the risk created by any of these events. Best of all, they can use data that’s already in the network to get these insights, which means no bandwidth impact and no disruptions to live traffic.

AI makes fiber sensing smarter

Artificial intelligence (AI) technologies can help R&E network operators get more value from fiber sensing. By combining fiber sensing with AI that can learn what different physical signals indicate, an operator can find problems before they impact the network and help its teams make smarter decisions to resolve them.

Operators may get higher-than-anticipated volumes of event data when they make the shift from fiber monitoring to fiber sensing. AI can extract meaningful insights from this data by using machine learning to determine the difference between normal and abnormal occurrences for a given network site or fiber corridor. 

For example, if a network hut is located in a busy area, AI can learn to recognize and filter normal background noise and vibration patterns. It can also learn routine maintenance schedules and treat these activities as normal. If the AI system detects an unexpected event such as the presence of a person in the hut outside normal or planned maintenance periods, it can trigger an alert.

AI can also learn to address abnormal events proactively, such as identifying an unexpected construction crew digging dangerously close to a cable. In the air control outage, it’s quite probable that an alarm could have sounded well before the cable was damaged, stopping the crew in advance. R&E network operators could similarly benefit from having better information and more time to act when threats arise.

Fiber sensing applications for R&E networks

A simple example illustrates how real-time insights from fiber sensing provide important advantages over the post-event data provided by fiber monitoring. With fiber monitoring, an R&E network operator might learn that one of its fiber cables was cut in a university campus server room in the early hours of the morning. Armed with the sophisticated sound detection capabilities of fiber sensing, the same operator might learn that an abnormal event began a few minutes earlier, with a door being forced open, followed by footsteps or talking. 

But there’s more to this than network reliability; it also means the fiber can be used as a sort of continuous microphone. For example, fiber sensing can simplify route characterization, turn-up validation, fault localization and post-repair verification. It can also be used in studies for monitoring seismic conditions, weather events, and vehicular, train or pedestrian traffic. The fiber itself is a highly sensitive sensor that can offer data for many research applications.  One example, the Norwegian NREN, Sikt, has been conducting seismic studies using subsea cables for several years. 

Elsewhere, fiber sensing might detect heat from a fire within a fiber corridor or vibrations that indicate a fishing trawler is dragging a net too close to an undersea fiber cable. In all cases, fiber sensing gives the operator advance warning and detailed insights that help it take action to prevent the damage and avoid the related cost, downtime and reputational damage. This improved responsiveness can also help operators fulfill regulatory requirements relating to network monitoring, security and resilience, such as those detailed in NIS2 and the EU 5G Security Toolbox.

Opportunities for collaborative innovation

Fiber sensing can provide a shared platform for experimentation and scientific discovery. For instance, R&E network operators could make their fiber sensing capabilities available to support research applications such as seismic, weather and ocean monitoring using optical communications infrastructure already deployed across regions and continents.

As discussed in a recent GÉANT white paper, offering access to fiber sensing could enable R&E network operators to attract collaborators across a variety of fields, from scientific research and civil engineering to smart cities and energy. Potential users and beneficiaries of fiber sensing innovations include academic and research institutions, national research and education networks (NRENs), civilian government and defense agencies, telecommunication providers, oil and gas companies, and power utilities.

An investment in network health and scientific discovery

R&E network operators need to modernize their fiber optic networks to keep pace with the data and performance demands of the research community. As coherent optics and DSPs provide improved sensitivity, and AI models get better at recognizing abnormal events, fiber sensing will become a standard feature of the network. By taking advantage of fiber sensing, operators will be able to protect their network infrastructure more proactively and fuel new forms of innovation within the research community and beyond.

Let’s talk about fiber sensing

We’ll be at Supercomputing 2026 in Chicago November 15-20. We invite you to visit us and discuss how fiber sensing capabilities continue to evolve and could be helpful in your work. 

Find out more on our research and education networks web page.