Time-Varying Gain in Optical Signal Detection for Wider Dynamic Range
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Solution Overview
Problem
The optical signal detection apparatus in existing OTDRs has a limited capability for signal sampling, leading to low measurement accuracy and a small actual dynamic range.
Innovation Solution
An optical signal detection apparatus with an optical-to-electrical conversion module, control module, and gain adjustment module, which adjusts signal amplitude using different gain values in different detection time periods to ensure the electrical signal is within the sampling range of the analog-to-digital conversion module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed gain value is used in the optical signal detection apparatus, then the device complexity is reduced, but the measurement precision and dynamic range deteriorate due to inability to properly sample signals with varying amplitudes from different distances
Solution Approach 1:
The patent applies dynamics by making the gain value adjustable rather than fixed. The gain adjustment module dynamically changes the gain value based on the detection time period, allowing the system to adapt to signals with different amplitudes from various distances. This resolves the contradiction by introducing controlled variability that improves measurement precision without excessive complexity increase.
Solution Approach 2:
The patent changes the parameter of gain value over time, dividing the detection cycle into multiple time periods with different gain values. This parameter change approach allows proper sampling of both strong signals from near distances and weak signals from far distances, improving measurement accuracy and dynamic range while maintaining reasonable system complexity.
2Device complexity
If a fixed gain value is used in the optical signal detection apparatus, then the device complexity is reduced, but the actual dynamic range deteriorates due to limited sampling capability for signals with large amplitude differences
Solution Approach 1:
The patent makes the gain value dynamic by introducing a gain adjustment module that changes gain based on detection time period. This allows the system to handle a wider range of signal amplitudes from different distances, thereby expanding the actual dynamic range without significantly increasing device complexity.
Solution Approach 2:
The patent segments the detection cycle into multiple time periods, each with its own optimized gain value. This segmentation allows the system to properly process signals from different distance ranges (near end, middle, distal end) that have different amplitude characteristics, thereby improving the actual dynamic range while keeping the overall structure manageable.
3Device complexity
If signal amplitude is not adjusted for different detection time periods, then the device complexity is reduced, but the integrity of signal sampling deteriorates leading to loss of signal information
Solution Approach 1:
The patent changes the gain parameter according to detection time period to ensure that signal amplitudes from different distances are properly scaled for sampling. This prevents signal saturation for near-end signals and signal loss for distal-end signals, maintaining sampling integrity without excessive complexity increase.
Solution Approach 2:
The patent performs preliminary gain adjustment on the electrical signal before it enters the analog-to-digital conversion module. By pre-adjusting the signal amplitude according to the detection time period, the system ensures that signals are within the optimal sampling range, preventing information loss and maintaining sampling integrity.
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 improves the measurement accuracy and actual dynamic range of the optical fiber measurement device by ensuring integrity of signal sampling and continuity of the signal strength curve with distance.
Implementation Method 1
an optical-to-electrical conversion module configured to receive an optical signal, and convert the received optical signal into an electrical signal
Data Source
AI summary
An optical signal detection apparatus. The apparatus includes an optical-to-electrical conversion module, a control module, a gain adjustment module, and an analog-to-digital conversion module. The optical-to-electrical conversion module is configured to receive an optical signal, and convert a received optical signal into an electrical signal; the control module is configured to obtain a first gain value corresponding to a first detection time period, the first detection time period is a detection time period in the detection cycle, different detection time periods in the detection cycle correspond to different gain values, and the first gain value is used for controlling the gain adjustment module to adjust an amplitude of the electrical signal; and the analog-to-digital conversion module is configured to perform sampling on an adjusted electrical signal, where the adjusted electrical signal is in a sampling range of the analog-to-digital conversion module.