Fiber SenSys delivers fibre optic intrusion detection systems built for high security environments. The technology protects outdoor perimeters and physical data networks where early detection and precise location matter.
Security teams across the world rely on Fiber SenSys to monitor fences, buried infrastructure, and critical communication routes. The systems detect climbing, cutting, digging, and tampering attempts along the protected line. Operators receive accurate alerts with clear location data, which supports faster investigation and response.
Fiber SenSys solutions operate across some of the most sensitive facilities in the world. Deployments protect airports, data centres, government facilities, utilities, and other critical infrastructure sites where perimeter security and network protection play a central role.
Using fibre optic sensing technology, the cable itself becomes the sensor. This approach allows long distance monitoring with stable performance and minimal electronics in the field. The result is reliable intrusion detection across large perimeters and sensitive infrastructure routes.
Perimeter Breaches
Because attempts to cut, bend, or open the cables will trigger an alarm, they are highly resilient against even the most thorough intruders. Plus, they can be deployed over large areas, for monitoring intrusion over longer distances, making them a go-to choice for protecting pipelines and larger perimeters. When used as PDS, their ability to detect naturally occurring damage, as well as intentional, makes them a vital part of any critical communications infrastructure. For example, they can signal an early warning if an underground or underwater communications line has caved in, allowing maintenance to be carried out faster.
Advanced detection capabilities
Fibre optic perimeter intrusion detection systems have many benefits that stem from their highly sensitive intrusion detection capabilities. The sensitivity of fibre optic sensors means intruders will be detected even if they try to climb a fence slowly and quietly to avoid detection. However, detection capabilities are best evaluated in comparison to other types of detection, such as LiDAR security systems. The main strength of fibre optic detection is that because it is a light, rather than an electronic-based system, it cannot be affected by natural or intentional electromagnetic interference. This lowers false alarms and keeps your security tight when you need it most.
Extreme durability and weatherproofing
These systems are built to be highly durable and resilient for decades of use in practical security applications. Sections are also able to be repaired or replaced easily, such as if intruders cut cables. We offer a redundant processing option with our processors, which gives you fallback processors that activate if the first one fails or is destroyed. Redundant processing means that even if intruders manage to enter the top-security area where your security processors are kept, and destroy the electronics there, the system can switch to a backup elsewhere and continue running.
The standard cable jacketing we deploy in all our fibre optic intrusion detection systems is highly weatherproof. On average, they are designed to maintain reliable detection while mounted outside for over 20 years. However, we also offer more robust solutions for extreme weather conditions, so you can detect intruders in any circumstance. Utilising enclosures, or embedding the system in a fence, wall or underground adds to the level of durability.
OPTEX Fiber Defender fibre optic devices detect vibration and disturbance
Fiber Defender sensors use fibre optic sensing cable to protect fences, walls and long perimeters. The cable detects physical disturbances such as cutting, climbing, lifting or tampering. When movement affects the protected structure, the Alarm Processing Unit analyses the vibration pattern and turns it into an alarm event. This gives security teams early warning before an intruder reaches the protected asset.
Fibre optic perimeter detection for harsh environments
Fiber Defender systems are designed for demanding outdoor sites, including critical infrastructure, utilities, solar farms, transport sites and high-security perimeters. Since the sensing cable is passive and contains no electronics in the field, it is immune to EMI, RFI and lightning. This helps maintain stable detection performance in exposed environments where weather, electrical interference and long fence lines create challenges for conventional systems.
Independent detection zones and system integration
Fiber Defender systems divide the protected perimeter into independent zones. Each zone has its own tuning and alarm output, helping security teams identify where an intrusion attempt is taking place. These zones support integration with CCTV, VMS platforms, lighting, warning systems and alarm systems, so each section of the perimeter triggers the right response.
Different models support different site sizes. The FD7104 provides up to four independent zones with up to 800m of sensing cable per zone. The FD525 and FD525R support up to 25 independent, tunable zones with up to 800m of sensing cable per zone. This makes Fiber Defender suitable for both medium-sized sites and large-scale perimeter projects.
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FAQ
Fibre optic sensing is immune to electromagnetic interference and radio frequency interference because the sensing cable uses light rather than electrical signals.
This makes it well suited to sites with high electrical noise, power equipment, communications infrastructure, rail environments or exposed outdoor perimeters.
Fibre optic sensing cable also contains no powered electronics along the fence line, which helps reduce exposure to lightning-related electrical damage at the perimeter.
Yes. Fibre optic detection can be used on fences, walls and other perimeter structures.
On fences, the sensing cable detects activity such as climbing, cutting, lifting, impact and tampering. It is commonly used on chain link, welded mesh and other fence types.
On walls, the cable can detect attempts to climb, disturb or interfere with the protected structure. Suitability depends on the wall construction, fixing method and site conditions.
Fibre optic perimeter detection usually protects a perimeter by dividing the sensing cable into detection zones. When an alarm occurs, the system identifies the affected zone.
Point location DAS, such as EchoPoint, provides more precise location information along the cable. It can identify where the activity occurred, rather than only which zone was triggered.
Simple difference:
Fibre optic detection tells you which zone is in alarm.
Point location DAS tells you where along the cable the activity happened.
Choose fibre optic detection for reliable zoned perimeter protection.
Choose point location DAS when the site needs long-range coverage with more precise alarm location, such as large airports, energy sites, rail routes or critical infrastructure.
Choose fibre optic detection when you need long-distance perimeter protection across a fence, wall or defined boundary.
It is well suited to datacentres, airports, utilities, rail sites, prisons, military sites, energy facilities, warehouses and other critical infrastructure.
It is a strong choice when you need:
Long perimeter coverage
Early warning at the boundary
Passive sensing cable with no powered electronics along the fence line
Stable outdoor performance
Multiple detection zones
Resistance to EMI, RFI and lightning
Integration with wider security systems
Fibre optic perimeter detection uses a sensing cable to detect intrusion activity along a fence, wall or boundary.
The cable acts as the sensor. When someone climbs, cuts, lifts, tampers with or disturbs the protected structure, the system analyses the vibration and triggers an alarm. It helps security teams detect intrusion attempts before an intruder reaches the protected asset.
How does fibre optic perimeter detection work?
A fibre optic sensing cable is installed along the protected perimeter, usually on a fence, wall, gate line, cable route or other boundary structure.
When activity occurs, such as climbing, cutting, lifting, impact or tampering, the cable detects the vibration created by that movement. The alarm processing unit analyses the signal and decides whether it matches a real intrusion event.
Depending on the system, the perimeter can be divided into multiple detection zones. Each zone can be adjusted to suit the fence type, site layout and environmental conditions.
