PON Fiber Sensing with Switchable Reflection Units
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Solution Overview
Problem
Existing optical fiber sensing technologies face challenges in individually detecting failures in multiple optical fiber transmission lines connected to optical network units (ONUs) within a passive optical network (PON) system, particularly due to varying line lengths and the need to stop communication for detection.
Innovation Solution
An optical fiber sensing system that includes an optical line terminal (OLT), multiple ONUs, a first optical fiber transmission line, and a plurality of second optical fiber transmission lines, with reflection units capable of individually switching the reflection of pulsed light, allowing for sequential failure detection without requiring different line lengths or communication stoppage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical fiber sensing technology is applied to detect failures in multiple optical fiber transmission lines connected to ONUs, then failure detection capability is improved, but the system requires different line lengths and communication stoppage which increases operational complexity and reduces productivity
Solution Approach 1:
The invention segments the optical fiber transmission lines by assigning unique identification information to each ONU. The sensing device divides the detection process into individual ONU-specific detections, allowing each line to be independently identified and monitored without requiring different physical line lengths. This segmentation enables parallel processing of multiple lines while maintaining individual traceability.
Solution Approach 2:
The invention introduces an intermediary identification mechanism (unique ID information) that mediates between the sensing device and multiple optical fiber lines. Instead of relying on physical line length differences as the intermediary for differentiation, the system uses optical signals carrying identification information to distinguish between different ONUs and their connected lines, simplifying the overall system configuration.
2Measurement precision
If optical fiber sensing technology is applied to detect failures in multiple optical fiber transmission lines, then individual line detection is improved, but communication must be stopped which reduces productivity
Solution Approach 1:
The invention implements periodic action by sequentially detecting each optical fiber transmission line in time-divided slots. The sensing device alternates between communication periods and detection periods for each ONU, allowing normal communication to continue in other lines while one line is being detected. This periodic switching enables continuous operation without complete communication stoppage.
Solution Approach 2:
The system dynamically switches between different detection modes and communication modes for different ONUs. The sensing device can adaptively adjust which lines are being detected at any given moment, allowing flexible resource allocation that maintains communication productivity while ensuring comprehensive failure detection across all lines.
3Device complexity
If traditional optical fiber sensing is used without individual reflection unit switching, then detection process is simplified, but individual failure detection in multiple lines becomes impossible
Solution Approach 1:
The invention segments the reflection function by providing individual reflection units at each ONU that can be independently controlled. Each reflection unit corresponds to a specific optical fiber line, allowing the sensing device to activate only the necessary reflection unit during detection. This segmentation maintains simplicity by keeping each reflection unit independent while enabling precise individual line detection through selective activation.
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 individual detection of failures in multiple optical fiber transmission lines connected to ONUs within a PON system, ensuring continuous communication and eliminating the need for varying line lengths or communication stoppages during detection.
Implementation Method 1
an optical output unit configured to output pulsed light to the first optical fiber transmission line
Implementation Method 2
a plurality of reflection units provided in each of the plurality of second optical fiber transmission lines... output reflected light obtained by reflecting the pulsed light
Data Source
AI summary
An OLT, a plurality of ONUs, an optical fiber connected to the OLT, a plurality of optical fibers connected to each of the plurality of ONUs, an optical output unit configured to output pulsed light to the optical fiber, a plurality of reflection units provided in each of the plurality of optical fibers, a branching unit configured to connect the optical fiber and each of the plurality of optical fibers, an optical input unit configured to receive the reflected light from the optical fiber, and a detection unit configured to analyze a pattern of the reflected light to detect a failure of the optical fiber provided with the reflection unit that has output the reflected light are provided, in which each of the plurality of reflection units can individually switch execution of reflection of the pulsed light.