Alarmed Fiber Optic Lines for Intrusion Detection
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Solution Overview
Problem
Current protective distribution systems for fiber optic cables rely on costly and error-prone human visual inspections for intrusion detection, and existing alarmed carrier systems are expensive to install and limited in their ability to continuously monitor data transmission.
Innovation Solution
A protected distributed fiber optic network with alarmed fiber optic lines that connect secured junction boxes to user lock boxes, using looped alarm lines for continuous monitoring and tamper detection, eliminating the need for periodic visual inspections and allowing for secure data transmission at 40 Gbps rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If human visual inspections are used for intrusion detection, then the system is simple to implement, but it is error-prone and cannot provide continuous monitoring
Solution Approach 1:
The patent replaces manual visual inspection with an optical monitoring system that uses fiber optic cables and light-based detectors to continuously monitor for intrusion. The system substitutes mechanical human inspection with an automated optical detection mechanism that can operate continuously without human intervention.
Solution Approach 2:
The patent implements continuous monitoring by maintaining constant optical contact between the monitoring fiber and the protected cable. The system provides uninterrupted detection capability through continuous light transmission and real-time signal analysis, eliminating the periodic nature of manual inspections.
2Reliability
If alarmed carrier systems are installed, then continuous monitoring is achieved, but installation cost increases significantly
Solution Approach 1:
The patent makes the protected cable serve multiple functions: it acts as both the data transmission medium and the intrusion detection sensor. The same cable that carries information also contains the alarm function through embedded optical elements, eliminating the need for separate alarmed carrier infrastructure.
Solution Approach 2:
The patent combines the data transmission function and intrusion detection function into a single integrated cable system. The monitoring fiber is integrated within the protected cable structure, merging what were previously separate systems into one unified component that reduces installation complexity and cost.
3Object-affected harmful factors
If encryption is used to protect data transmission, then data security is improved, but transmission speed decreases and equipment requirements increase
Solution Approach 1:
The patent substitutes encryption-based security with physical security through the protective distribution system. Instead of using cryptographic mechanisms that process data, the system uses physical protection and optical monitoring to prevent interception, allowing data to travel unencrypted at full fiber optic speeds.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides continuous, cost-effective intrusion detection and secure data transmission without the need for concrete encasement or manual inspections, enabling rapid redeployment and higher data transfer rates than copper systems while meeting government security standards.
Implementation Method 1
data is sent by fiber optic cables
Implementation Method 2
An alarm fiber optic line in the cable connects the junction box to the user box
Data Source
AI summary
A fiber optic network has alarmed fiber optic lines in the cables connecting a secured junction box to plural user lock boxes. An outgoing alarm line and return alarm line in each cable connect the junction box to each user box. The outgoing alarm line is looped to the return alarm line inside the user lock box. The return alarm line is looped to the outgoing alarm line of a different cable inside the junction box to interconnect a plurality of alarm lines passing through a plurality of user boxes. A detector detects an alarm signal in the connected alarm lines to trigger an intrusion alarm. Power to the components in the box is disconnected when the box is opened and ventilation openings to the box are closed when the box is closed.