Coded-Sequence OTDR Trace Reconstruction for Artefact Suppression
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Solution Overview
Problem
Existing technologies fail to effectively address the issue of noise interference in coded-sequence OTDR systems, leading to artefacts in OTDR traces, especially in the presence of strong reflective events.
Innovation Solution
The method involves performing multiple coded-sequence OTDR acquisitions with different inter-pulse intervals to shift the positions of artefacts in the OTDR traces, followed by combining these traces to reconstruct a high-quality OTDR trace, using techniques such as masking and averaging to eliminate or reduce artefacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If coded sequence OTDR is used to enhance dynamic range, then the required averaging time is reduced, but artefacts are generated in the OTDR trace
Solution Approach 1:
The invention segments the coded sequence into multiple sub-sequences, each processed separately to generate individual OTDR traces. By dividing the original coded sequence (e.g., Golay codes) into smaller segments and processing them independently, the system reduces the artefact generation while maintaining the dynamic range enhancement benefits of coded sequence OTDR.
Solution Approach 2:
The invention applies partial action by using only a portion of the coded sequence information. Instead of processing the complete coded sequence as a single unit, the method processes segments of the sequence, applying correlation or matrix operations to each segment separately. This partial processing approach reduces artefact generation while still achieving dynamic range enhancement.
2Loss of time
If long pulse widths are used to minimize acquisition time, then the required averaging time is reduced, but spatial resolution deteriorates
Solution Approach 1:
The invention changes the parameter of pulse width by using variable pulse widths within the coded sequence. Instead of using a single long pulse width for the entire sequence, the system employs a series of pulses with different widths, allowing optimization of both acquisition time and spatial resolution through parameter variation.
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 approach significantly reduces or eliminates artefacts in OTDR traces, enhancing the accuracy and clarity of event detection in optical fiber characterization, particularly for low-loss or low-reflectance events.
Implementation Method 1
returning light, arising from backscattering and reflections along the fiber link, is detected and analyzed
Implementation Method 2
returning light, arising from backscattering and reflections along the fiber link, is detected and analyzed
Data Source
AI summary
There are provided coded-sequence OTDR methods and devices which diminish or erase artefacts created in the OTDR trace by performing multiple coded-sequence OTDR acquisitions with mutually different inter-pulse intervals so as to change the positions of the artefacts in the OTDR traces derived from these OTDR acquisitions and combining the multiple OTDR traces to reconstruct a reconstructed OTDR trace.