Distributed Fault Sensing in Optical Communication Systems
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Solution Overview
Problem
Optical fiber communication systems face challenges in fault recovery, especially in undersea and remote terrestrial systems, where alternate routes for rerouting signals are difficult and expensive to establish, and reliance on a single centralized network management system is undesirable for distributed fault sensing and recovery.
Innovation Solution
A distributed fault sensing and recovery system that uses autonomous controllers at cable stations to detect and respond to faults by adjusting transmitter parameters, such as channel power levels and tone distribution, without requiring a centralized network management system, allowing for localized decision-making and parallel processing to maximize channel recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a centralized network management system is used for fault recovery, then fault management is simplified, but response time increases and system reliability decreases
Solution Approach 1:
The patent divides the centralized network management system into distributed master controllers located at each cable station. Each master controller independently monitors local faults and executes recovery actions autonomously, eliminating the single-point bottleneck and reducing fault response time while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent combines fault detection, fault decision-making, and fault recovery execution functions directly at the cable station level within the master controller. This merging of functions eliminates communication delays with centralized systems and enables immediate local response to faults.
2Reliability
If alternate routes are provided for protection switching, then system reliability improves, but device complexity and cost increase
Solution Approach 1:
The patent changes the operational parameters of existing transmission paths by dynamically adjusting transmitter parameters (power levels, modulation schemes) and switching between forward and reverse directions of the same fiber. This enables protection switching without requiring physical alternate routes, maintaining reliability while avoiding the complexity of redundant infrastructure.
Solution Approach 2:
The patent utilizes the reverse direction of the same fiber optic cable for protection switching instead of requiring separate forward-direction paths. By inverting the signal transmission direction, the system creates protective alternate paths using existing infrastructure, reducing complexity while maintaining reliability.
3Productivity
If transmitter parameters are adjusted for fault recovery, then channel recovery improves, but signal quality may deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where the master controller continuously monitors signal quality metrics (BER, power levels) after adjusting transmitter parameters. Based on this feedback, the system can fine-tune parameters or revert adjustments if signal quality deteriorates, ensuring that channel recovery does not compromise overall signal integrity.
Solution Approach 2:
The patent employs dynamic adjustment of transmitter parameters based on real-time fault conditions and network state. Rather than fixed parameter changes, the system adapts power levels, modulation formats, and switching decisions dynamically to maximize channel recovery while maintaining acceptable signal quality thresholds.
Data Source
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AI summary
A method and system for distributed fault sensing and recovery in a communication system. A master controller is provided in each cable station of the system. Each master controller receives local alarms, e.g. aggregated alarms from associated shelf controllers, and may receive remote alarms from other master controllers. Local and remote alarms are compared to a profile provisioned in the master controllers for determining whether to perform a fault recovery function.