BEYOND THE EPISODE | AMANDA FROM NIS
How fiber optic cables can detect activity, identify threats, and help protect critical assets.
In our latest Amanda from NIS episode, we're breaking down Distributed Acoustic Sensing (DAS)—a technology that transforms standard fiber optic cable into a powerful sensing system.
But how does it work, and what can it actually do?
Let's take a closer look at the technology and how Network Integrity Systems (NIS) uses DAS to protect critical infrastructure.
Most people think of fiber optic cable as a way to transmit data. But that same fiber can also detect activity happening around it.
DAS works by sending pulses of light through an optical fiber and analyzing tiny changes in the light scattered back. When vibrations or acoustic energy affect the fiber, they create measurable changes that sophisticated processing technology can analyze.
The result? A fiber optic cable becomes a continuous sensor capable of detecting and locating activity along its length.
Unlike traditional sensors installed at individual locations, DAS can monitor long stretches of infrastructure using a single optical fiber, often leveraging existing fiber infrastructure.
What Can DAS Detect?
Depending on the application and installation environment, DAS can detect a wide range of activity, including:
But detecting vibration is only the beginning.
Advanced DAS systems can analyze activity patterns to help distinguish routine events from potential threats. For example, a vehicle passing near a buried cable may be harmless, while an excavator digging in that same location could require immediate attention.
The real value lies in knowing what is happening, where it's happening, and whether action is needed.
Underground fiber networks and utility infrastructure face threats from accidental excavation damage, intentional cuts, and other physical disturbances.
DAS provides early warning of potentially damaging activity, often before a cable is severed or service is interrupted.
At NIS, we've conducted extensive real-world testing with different fiber cables, conduit configurations, burial depths, and excavation equipment to evaluate detection and classification capabilities.
Explore VANGUARD FOCUS – Infrastructure Protection
Cameras are an important part of physical security, but they have limitations. Blind spots, poor visibility, terrain, and even individuals who know how to avoid camera coverage can leave critical facilities vulnerable.
DAS adds a powerful layer of security by detecting physical activity along protected boundaries, even when that activity isn't visible to a camera.
Fiber can be installed along fences, buried underground, or deployed across expansive borders and remote terrain to detect activities such as walking, climbing, digging, cutting, or unauthorized vehicle movement.
For facilities such as data centers, substations, power plants, and military installations, DAS can help identify intrusion activity before an individual reaches a sensitive area.
For large borders and remote perimeters, it provides continuous monitoring across long distances, helping security teams detect, locate, and track potential intrusions without relying solely on cameras or individual point sensors.
And detection is just the beginning.
Through NIS INSIGHT software, verified events can be used to direct other security systems—including cameras and potentially drones—toward the activity, giving security personnel greater situational awareness and a more coordinated response.
The advantage is a layered security approach: DAS detects the activity, while other systems help verify and respond to the threat.
Explore SENTINEL FOCUS – Perimeter and Border Security
Pipelines, transportation corridors, borders, and other critical assets can extend across vast distances.
DAS enables continuous monitoring without installing individual electronic sensors at every location. Depending on the technology and deployment conditions, sensing distances can reach up to 100 kilometers.
This makes it especially valuable for remote or geographically dispersed infrastructure.
Detecting activity is important. Knowing what to do with that information is what makes it valuable.
NIS FOCUS technologies, combined with advanced processing and alarm management, help organizations:
Detect. Recognize activity that may threaten critical infrastructure.
Identify. Distinguish between different types of events and potential threats.
Locate. Pinpoint where activity is occurring.
Alarm. Generate actionable alerts so teams can respond.
NIS INSIGHT software further processes and validates events, helping reduce unnecessary alarms and integrate sensing data with existing security and operational systems.
Rather than overwhelming operators with vibration data, the objective is to deliver meaningful intelligence that supports faster, more informed decisions.
Learn more about NIS INSIGHT Alarm Management
While DAS technologies share common sensing principles, performance can vary considerably.
Factors such as sensing distance, cable construction, installation methods, environmental conditions, and event classification capabilities all affect results.
That's why NIS emphasizes real-world testing. Our technologies are evaluated in practical environments to understand not just whether an event can be detected, but how accurately it can be identified, located, and alarmed.
Fiber optic infrastructure is essential to modern communications. With DAS, that same infrastructure can also become a powerful tool for protecting the physical world around it.
From preventing fiber cuts to detecting perimeter intrusions and monitoring remote borders, DAS is helping organizations identify threats earlier and respond more effectively.
At Network Integrity Systems, we're focused on turning that capability into practical, actionable solutions.
Detect Earlier. Respond Smarter.
Want the quick explanation?
Watch Amanda from NIS: Making Sense of Fiber Optic Sensing — What Is DAS?
Episode 3: What Is DAS? | Making Sense of Fiber Optic Sensing™
Explore NIS fiber optic sensing solutions: