Multi-Pulse OTDR Testing for Proximal Saturation Control
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Solution Overview
Problem
Existing optical time domain reflectometers (OTDRs) face limitations in expanding their dynamic range without costly hardware modifications, leading to scattering saturation at the proximal end, which hinders the detection of structural defects in optical fibers.
Innovation Solution
A pulse testing method that uses multiple pulses of different widths to obtain and fit test data, avoiding hardware modifications by controlling the emission of test beams with varying pulse widths to expand the dynamic range and cover scattering saturation areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the dynamic range of OTDR is increased to measure longer optical fibers, then the measurable fiber length is extended, but scattering saturation occurs at the proximal end
Solution Approach 1:
The patent segments the optical fiber testing into multiple pulse width stages: a first pulse width for proximal end testing and a second pulse width for distal end testing. This segmentation allows each pulse width to be optimized for its specific testing range, avoiding scattering saturation while extending the overall measurable length.
Solution Approach 2:
The patent dynamically adjusts the pulse width parameter based on the testing requirements. The OTDR automatically selects between first and second pulse widths depending on the fiber length and testing conditions, making the system adaptable to different measurement scenarios without hardware modifications.
2Adaptability or versatility
If hardware modifications are made to expand dynamic range, then the test capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent changes the operational parameters (pulse width) of the existing OTDR hardware to achieve expanded dynamic range. By using different pulse widths instead of modifying hardware, the system achieves greater adaptability while maintaining simple device architecture.
Solution Approach 2:
The patent uses data fitting and processing to create a complete test curve from multiple partial tests. The processing module synthesizes results from tests using different pulse widths to produce what would require complex hardware modifications to obtain directly.
3Ease of operation
If a single pulse width is used for testing, then the testing process is simple, but the dynamic range is limited
Solution Approach 1:
The patent employs periodic action by automatically switching between different pulse widths based on testing progress. The system performs initial testing with one pulse width, then transitions to another pulse width to continue testing, creating a systematic multi-stage testing process that maintains simplicity while expanding capability.
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
The method effectively extends the testable dynamic range of OTDRs, allowing for longer optical fiber measurements with reduced hardware dependence and costs, while maintaining accurate detection of fiber conditions.
Implementation Method 1
Optical Time Domain Reflectometer (OTDR) is an instrument that measures an optical fiber by using the scattering of light as it travels through the optical fiber.
Implementation Method 2
An OTDR emits a test beam from a test port and simultaneously tests a reflected or scattered beam formed by the test beam.
Data Source
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Figure 3
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AI summary
A pulse testing method and device, a testing apparatus, and a storage medium are disclosed, the pulse testing method includes: performing (S 110) a pulse test on an optical fiber by using a plurality of pulses of different pulse widths respectively to obtain test data; and fitting (120) the test data corresponding to the plurality of pulses of different pulse widths.