Adjustable-Gain Power Measurement for Wide-Range Light Signals
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Solution Overview
Problem
Fiber optic receivers lack the resolution and accuracy to measure the power of weaker light signals over a wide dynamic range, as they typically only provide precise measurements for strong signals near the top end of their input power capabilities.
Innovation Solution
The implementation of an adjustable gain amplifier with multiple gain values and calibration factors, coupled with an analog-to-digital converter, allows for improved resolution and accuracy in electromagnetic radiation power measurements across a wider dynamic range by adjusting the gain based on digital samples and applying calibration factors to the samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed gain amplifier is used in the measurement system, then the circuit complexity is reduced, but the measurement precision deteriorates for weak signals within a wide dynamic range
Solution Approach 1:
The patent implements an adjustable gain amplifier that can dynamically switch between multiple gain values (e.g., 2x, 4x, 8x) based on the input signal strength. This dynamic adjustment allows the system to maintain high measurement precision across a wide dynamic range by selecting appropriate gain levels for different signal conditions, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The system changes the gain parameter of the amplifier based on the detected signal level. By adjusting the gain parameter dynamically rather than using a fixed value, the system achieves high precision measurements for both strong and weak signals within the same device, effectively resolving the technical contradiction.
2Measurement precision
If multiple gain values are implemented to improve measurement resolution, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The system employs feedback mechanisms where the digital sample values are used to determine the appropriate gain setting. The controller monitors the input signal level and automatically selects the suitable gain value, eliminating the need for manual configuration and reducing the perceived complexity while maintaining high measurement precision.
Solution Approach 2:
The measurement system performs self-adjustment by automatically selecting the appropriate gain value based on the detected signal strength. This self-service capability allows the system to maintain high resolution measurements across different signal conditions without requiring external intervention or complex manual configuration.
3Adaptability or versatility
If a single measurement range is used, then the device complexity is reduced, but the adaptability deteriorates for measuring signals of varying strengths
Solution Approach 1:
The measurement system is designed to handle multiple measurement ranges within a single device by implementing adjustable gain settings. This multi-functionality allows the same device to accurately measure both strong and weak signals across a wide dynamic range, achieving universality without proportionally increasing complexity.
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 solution enhances the measurement system's ability to accurately measure light signal power over a broader range, providing higher resolution and accuracy for both strong and weak signals, thereby improving the performance of fiber optic receivers.
Implementation Method 1
a photodiode configured to receive electromagnetic radiation and generate a first electrical signal in response to the received electromagnetic radiation. The magnitude of the first electrical signal may be based on the power of the electromagnetic radiation.
Data Source
AI summary
A method to measure and report electromagnetic radiation power includes receiving electromagnetic radiation and generating an electrical signal having a magnitude based on the power of the electromagnetic radiation. An adjustable gain may be applied to the electrical signal to generate an amplified electrical signal that may be sampled to generate a digital sample. The adjustable gain may be controlled based on the value of the digital sample and the digital sample may be associated with a gain value. One or more calibration factors may be selected based on the gain value associated with the digital sample and the selected calibration factor(s) may be used to calculate the power of the electromagnetic radiation.