Optical Spectral Analyzer Parallel Detection for Fast Multi-Channel Measurement
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Solution Overview
Problem
Current optical spectrum analyzers take a long time to measure multi-channel signals, often exceeding 150 milliseconds, and suffer from reduced resolution and increased signal noise due to detector saturation, while also being bulky and limited in placement options.
Innovation Solution
The solution involves a spectral analyzer that separates a multi-channel signal into multiple single-channel signals, measured simultaneously using a demultiplexer, tunable filters, and multiple detectors, reducing measurement time to less than 120 milliseconds, improving resolution, and compactifying the device to fit in smaller spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional optical spectrum analyzer measures a multi-channel signal sequentially, then the measurement can be performed with simple equipment, but the measurement time exceeds 150 milliseconds
Solution Approach 1:
The patent divides the multi-channel signal into multiple single-channel signals using a demultiplexer, allowing parallel measurement of individual channels. This segmentation enables the system to measure multiple wavelength segments simultaneously rather than sequentially, reducing measurement time from over 150ms to under 120ms while maintaining measurement accuracy
Solution Approach 2:
The patent transitions from a single-channel sequential measurement approach to a multi-channel parallel measurement approach by introducing multiple optical paths and detectors. This dimensional expansion from one measurement dimension to multiple simultaneous dimensions enables faster measurement of the complete spectral profile
2Measurement precision
If a conventional optical spectrum analyzer uses a single detector to measure the multi-channel signal, then the device structure remains simple, but detector saturation causes reduced resolution and increased signal noise
Solution Approach 1:
The patent segments the multi-channel signal into multiple single-channel signals before detection, distributing the signal load across multiple detectors. This prevents any single detector from becoming saturated while measuring the complete spectral range, thereby maintaining resolution and reducing noise floor effects
Solution Approach 2:
The patent introduces tunable filters as intermediary components between the demultiplexer and detectors. These filters dynamically select and pass specific wavelength segments to individual detectors, preventing saturation while ensuring all channels are measured with appropriate dynamic range and resolution
3Adaptability or versatility
If a conventional optical spectrum analyzer is designed with bulky components for comprehensive measurement capability, then the device can perform all required measurements, but the device size is large and placement options are limited
Solution Approach 1:
The patent merges multiple measurement functions into a single integrated device by combining the demultiplexer, tunable filters, multiple detectors, and signal processing capabilities in one compact unit. This consolidation maintains comprehensive measurement capability while significantly reducing the overall device footprint compared to traditional benchtop OSAs
Solution Approach 2:
The patent designs a universal measurement platform where the demultiplexer and tunable filters can dynamically reconfigure to measure different wavelength ranges and signal types. This multi-functional design enables a single compact device to perform various spectral analysis tasks without requiring multiple separate instruments
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 measurement time, enhances resolution, and minimizes signal noise, while significantly reducing the size of the spectral analyzer, allowing for faster and more precise analysis in smaller spaces.
Implementation Method 1
separating the multi-channel signal into a plurality of single-channel signals
Implementation Method 2
detectors configured to measure an optical power of the respective single-channel signals and convert the optical power into a plurality of respective electrical signals
Data Source
AI summary
An optical spectral analyzer for measuring an optical multi-channel signal by separating the multi-channel signal and measuring a plurality of single-channel signals simultaneously. The spectral analyzer can include a demultiplexer configured to receive the multi-channel signal. The multi-channel signal can be a multi-channel wavelength range. The demultiplexer can separate the multi-channel signal into the plurality of single-channel signals including a first single-channel signal and a second single-channel signal. The spectral analyzer can include a plurality of optical paths. The plurality of optical paths can include a plurality of respective detectors for measuring an optical power of the respective single-channel signals. The detectors can convert the optical power of the respective single-channel signals to corresponding electrical signals. In some examples, the spectral analyzer includes a controller configured to obtain the plurality of respective electrical signals simultaneously to correspondingly detect the optical power of the multi-channel signal across the multi-channel wavelength range.