Passive Optical Network Fault Isolation via OLT Power Detection
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Solution Overview
Problem
Existing Passive Optical Network (PON) systems face challenges in detecting and isolating faulty ONUs that constantly emit light, which can disrupt the entire network, leading to packet collisions and maintenance issues, especially since using active splitters compromises the reliability and increases costs.
Innovation Solution
The system employs an Optical Line Terminal (OLT) with an optical power detector to parse upstream signals, detect faulty ONUs by recording optical power, and remotely disable the optical transmitter of the faulty ONU using a control message, thereby isolating it without affecting other ONUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If active splitters are used to monitor sub-channels, then fault detection capability is improved, but system reliability deteriorates and maintenance costs increase
Solution Approach 1:
The system uses the existing passive optical network components and upstream signals to perform fault detection. The OLT analyzes the upstream signals from ONUs to detect faults, eliminating the need for active monitoring devices. This self-service approach maintains the passive nature of the network while achieving fault detection capability.
Solution Approach 2:
The invention extracts the fault detection function from the physical layer (optical signals) and implements it at the signal processing layer. By analyzing the upstream signals' optical power and characteristics, the system identifies faulty ONUs without requiring active splitters or additional monitoring hardware in the optical path.
2Difficulty of detecting and measuring
If active splitters are used to monitor sub-channels, then fault detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The OLT performs multiple functions: it processes upstream signals for data communication, detects optical power levels, identifies faulty ONUs, and controls downstream transmissions. This multi-functionality eliminates the need for separate active splitter devices, reducing overall system complexity while maintaining fault detection capability.
3Difficulty of detecting and measuring
If a faulty ONU constantly emits light, then the fault is obvious, but network stability deteriorates due to packet collisions
Solution Approach 1:
The system continuously monitors the optical power of upstream signals from all ONUs. When a fault is detected (such as constant light emission or abnormal optical power levels), the OLT sends feedback control messages to disable the affected ONU, preventing further packet collisions and restoring network stability.
Solution Approach 2:
The system performs preliminary detection of optical power anomalies before they cause extensive network disruption. By monitoring upstream signals continuously and identifying faulty ONUs early, the system can take preliminary action to isolate the fault and prevent widespread packet collisions.
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
This method enhances the security, stability, and self-recoverability of the PON by detecting and isolating faulty ONUs, preventing network disruptions and maintaining normal operations while reducing maintenance costs.
Implementation Method 1
the OLT detects the fault by recording the optical power of the upstream signal, locates the faulty ONU using the optical power
Data Source
AI summary
The present disclosure relates to a passive optical network (PON) and discloses a method and system for maintaining the PON where the optical line terminal (OLT) is provided with an optical power detection module for measuring the total power of optical signals received by the PON, and the optical network units (ONUs) are provided with an optical transmitter power supply module.