The application of the warning network (security monitoring and early warning network system) in the fiber optic cable line is crucial to ensure the security of the communication network, improve the efficiency of operation and maintenance, and prevent service interruptions. As the backbone of modern communications, the security of fiber optic cables directly affects key areas such as the Internet, finance, and medical care. The following are the main application areas of the warning network in fiber optic cable lines:

1. Fiber breakage and fault location

Application technology: OTDR (Optical Time Domain Reflectometer): Real-time monitoring of fiber reflection signals to accurately locate the break or bend point (accuracy can reach ±1 meter).
Distributed acoustic sensing (DAS): Use the optical fiber itself as a sensor to detect abnormal vibrations along the line (such as excavation, human damage).
Advantages: Quickly repair broken fibers and reduce network interruption time (such as shortening the repair time of submarine optical cable breaks from several days to hours).

2. Third-party construction damage warning

Application technology: Intelligent vibration sensor: Deployed along the cable to detect construction activities such as excavators and pile drivers.
AI video surveillance: Automatically identify construction machinery approaching prohibited areas and link sound and light alarms.
Advantages: Prevent accidents similar to the one in France in 2022 that caused the European aviation system to be paralyzed due to the digging of optical cables during construction.

3. Fiber optic eavesdropping and security protection

Applied technology: Polarized light monitoring: Detect changes in the polarization state of optical fibers and discover the access of eavesdropping devices.
Quantum key distribution (QKD): Deploy quantum communication warning networks on sensitive lines (such as government and financial dedicated lines).
Advantages: Prevent data leakage (such as military or financial data transmission being intercepted).

4. Natural disaster warning and protection

Applied technology: Earthquake warning: Use fiber DAS technology to monitor seismic waves and shut down vulnerable nodes in advance.
Flood monitoring: Install water level sensors in flood risk areas to trigger optical cable lifting or protection measures.
Advantages: Reduce the situation of large-scale damage to submarine cables similar to the 2011 Japanese earthquake.

5. Fiber optic performance degradation monitoring

Applied technology: Optical power monitoring: Real-time analysis of optical signal attenuation, predicting fiber aging or connector degradation.
Dispersion compensation monitoring: Ensure the quality of long-distance transmission signals.
Advantages: Shift from passive maintenance to predictive maintenance, reducing operation and maintenance costs.

6. Smart inspection and drone collaboration

Applied technology: Drone + infrared thermal imager: inspect optical cables at high altitudes or in remote areas to identify damaged outer skin or hot spots.
Robotic inspection: automatically inspect optical fiber distribution frames in confined spaces such as data centers.
Advantages: Replace high-risk manual inspections (such as optical cables on cliffs and high-voltage towers).

7. Network attack defense

Applied technology: Optical layer abnormal traffic detection: identify DDoS attacks or illegal access attempts.
Dynamic optical path switching: automatically switch to backup routes when an attack occurs.
Advantages: Improve the anti-attack capabilities of critical infrastructure (such as national Internet backbone networks).

8. Special protection of submarine optical cables

Applied technology: Sonar monitoring: prevent fishing boats from trawling or anchoring (accounting for 60% of submarine optical cable failures).
Shark bite detection: warn of marine life damage through optical fiber strain sensing.
Advantages: Reduce the number of repair ship dispatches (each cost exceeds one million US dollars).

9. Data center optical link health management

Applied technology: End-to-end optical performance analysis: real-time monitoring of the bit error rate and latency of interconnected optical cables between data centers.
Advantages: ensure low-latency demand scenarios such as cloud computing and high-frequency trading.

10. Public and emergency communication guarantee

Applied technology: emergency broadcast linkage: when the trunk optical cable is disconnected, automatically switch to satellite or microwave backup links.
Advantages: ensure smooth communication in emergency situations (such as rescue command during disasters).