Undersea Cable Aggression Detection via Polarization Analysis
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Solution Overview
Problem
In undersea optical fiber communication systems, pinpointing the location of external damage caused by external aggression, such as fishing trawlers or anchors, is time-consuming and costly when equipping each cable with sensors, and regulatory issues restrict the use of additional undersea equipment.
Innovation Solution
A system that uses existing coherent transponders to analyze the State-of-Polarization (SOP) of signals for rapid polarization changes, determining a time offset between signal directions to estimate the location of external aggression without adding new sensors or equipment to the optical cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are equipped on optical cables to detect external aggression, then detection capability is improved, but cost and device complexity increase significantly
Solution Approach 1:
The optical cable system uses its own existing infrastructure (coherent transponders and optical signals) to detect external aggression, rather than adding separate sensing equipment. The detection function is achieved by analyzing changes in the optical signal's state of polarization that occur when the cable is subjected to external forces, making the communication system itself serve the dual purpose of data transmission and security monitoring
Solution Approach 2:
The coherent transponder equipment, originally designed solely for optical signal transmission and reception, is enhanced to perform both communication and security detection functions. By analyzing the state of polarization of the optical signals passing through the cable, the same infrastructure provides both data transmission and external aggression detection, eliminating the need for dedicated sensing equipment
2Reliability
If sensors are equipped on optical cables to detect external aggression, then detection capability is improved, but cost increases significantly
Solution Approach 1:
The system uses its own existing infrastructure (coherent transponders and optical signals) to detect external aggression, rather than adding separate sensing equipment. The detection function is achieved by analyzing changes in the optical signal's state of polarization that occur when the cable is subjected to external forces, making the communication system itself serve the dual purpose of data transmission and security monitoring
Solution Approach 2:
The coherent transponder equipment, originally designed solely for optical signal transmission and reception, is enhanced to perform both communication and security detection functions. By analyzing the state of polarization of the optical signals passing through the cable, the same infrastructure provides both data transmission and external aggression detection, eliminating the need for dedicated sensing equipment
3Reliability
If additional undersea equipment is added to detect external aggression, then detection capability is improved, but regulatory compliance becomes difficult
Solution Approach 1:
The optical cable system uses its own existing infrastructure (coherent transponders and optical signals) to detect external aggression, rather than adding separate sensing equipment. The detection function is achieved by analyzing changes in the optical signal's state of polarization that occur when the cable is subjected to external forces, making the communication system itself serve the dual purpose of data transmission and security monitoring
Solution Approach 2:
The coherent transponder equipment, originally designed solely for optical signal transmission and reception, is enhanced to perform both communication and security detection functions. By analyzing the state of polarization of the optical signals passing through the cable, the same infrastructure provides both data transmission and external aggression detection, eliminating the need for dedicated sensing equipment
4Reliability
If traditional methods are used to locate external aggression on long cables, then detection is possible, but time consumption increases significantly
Solution Approach 1:
The system continuously monitors the state of polarization of optical signals in real-time as they traverse the cable, rather than waiting for an event to occur and then initiating a search. This continuous preliminary monitoring allows the system to immediately detect and locate external aggression when it happens, dramatically reducing the time required compared to traditional post-event location methods
Solution Approach 2:
The system replaces traditional mechanical or manual cable location methods (such as physical inspection or time-consuming signal tracing) with optical field-based detection. By analyzing changes in the state of polarization of light signals, the system can precisely locate external aggression events along the cable based on the timing and characteristics of the polarization changes, eliminating the need for slow mechanical location procedures
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
Enables real-time detection and location of external aggression on undersea optical cables without additional costs or equipment, overcoming the challenges of sensor costs and regulatory compliance, allowing for swift data transmission resumption.
Implementation Method 1
determines whether a first rapid polarization change occurred during the recovery of the first SOP, where the first rapid polarization change indicates an external aggression has occurred on an optical cable
Data Source
AI summary
A novel system and apparatus for detecting and locating an external aggression on at least one optical cable of an optical communication system is provided. For example, a signal from a transmitter may be received and analysis may be performed to recover a state-of-polarization (SOP) associated with the signal. A first rapid polarization change that occurs may be identified, which may indicate that an external aggression has occurred on the at least one optical cable. A time offset between the first rapid polarization change and a second rapid polarization change may be used to estimate a location of the external aggression.