PON Protection Device Isolating Signal Interference
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Solution Overview
Problem
In passive optical networks, signal interference from a single ONU can cause a collapse of the entire access network, requiring time-consuming manual intervention by technicians to identify and disconnect faulty branching lines, leading to prolonged network downtime.
Innovation Solution
A protection device with taps and switches, controlled by a detection system that temporarily disconnects branching lines to identify and isolate interference sources, using optical signal analysis to determine if a digital signal level sequence is present, and employing optical switches that can be turned off by optical signals or passive components like photodiodes and capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual intervention by technicians is used to identify and disconnect faulty branching lines, then the network can be recovered, but the network downtime is prolonged
Solution Approach 1:
The system enables automatic detection and isolation of faulty branching lines through the control device that monitors optical signals and activates switches to disconnect affected lines without technician intervention, making the system self-diagnosing and self-healing
Solution Approach 2:
The control device continuously monitors optical signals from taps in branching lines and the central cable, comparing detected signal characteristics against expected digital signal level sequences to automatically identify interference sources and trigger isolation actions
2Loss of time
If automatic detection and isolation systems are implemented, then network downtime is reduced, but the device complexity increases
Solution Approach 1:
The optical network is divided into separable branching lines with individual taps and switches for each line, allowing granular control and isolation of faulty segments while maintaining operational independence of healthy lines
Solution Approach 2:
Taps are introduced as intermediary components that extract monitoring signals from branching lines and the central cable without disrupting the main optical signal flow, enabling passive monitoring and automatic fault detection
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
Automates the identification and isolation of signal interference, reducing network downtime by quickly determining and disconnecting faulty lines, allowing the network to recover rapidly with minimal disruption to undisturbed branches.
Implementation Method 1
a first tap which is used for tapping off an optical signal flowing in the respective branching line to the central cable and a second tap which is arranged in the central cable and is used for tapping off an optical signal flowing in the central cable
Implementation Method 2
a converter device arranged at the second tap which converts light energy of the tapped-off optical signal into electrical voltage for controlling the corresponding switch in the branching line
Data Source
AI summary
The invention relates to a protection device for removing signal interference in a passive optical network and to a corresponding passive optical network and to a method for removing signal interference in a passive optical network.