Optical Spectrum Correction for Narrow Bandwidth Signals
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Solution Overview
Problem
Conventional optical spectrum analyzers face issues in obtaining accurate spectra when the wavelength bandwidth of measured light is narrower than the measurement wavelength resolution, leading to rounded peak portions and reduced sharpness, as well as discrepancies in peak power before and after correction.
Innovation Solution
A spectrum correction device and method that analyze the shape of optical spectra, perform correction processes based on selected methods such as wavelength resolution correction or shape correction, and synthesize the corrected data to minimize shape changes and maintain peak power consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple moving averaging correction process is performed on the measured optical spectrum, then the wavelength resolution is corrected and accurate optical spectrum can be obtained in many cases, but an accurate optical spectrum cannot be obtained when the wavelength bandwidth of light to be measured is narrower than the measurement wavelength resolution
Solution Approach 1:
The patent changes the correction parameters (correction depth, correction width) based on the measured optical spectrum characteristics. By dynamically adjusting these parameters, the system adapts to different light sources including narrow bandwidth DFB lasers, resolving the contradiction between general accuracy and narrow bandwidth applicability
Solution Approach 2:
The correction process transitions from static (fixed correction parameters) to dynamic (adaptive correction parameters based on spectrum analysis). The system continuously analyzes the optical spectrum shape and adjusts correction parameters in real-time, enabling accurate correction for both broad and narrow bandwidth light sources
2Ease of operation
If conventional correction processes are applied to narrow bandwidth light, then the measurement can be completed, but the peak portions become rounded and sharpness is reduced
Solution Approach 1:
The patent introduces dynamic adjustment of correction parameters based on peak detection and spectrum analysis. By reducing correction depth for narrow bandwidth signals and adjusting correction width based on peak characteristics, the system maintains peak sharpness while still performing necessary correction
Solution Approach 2:
The correction process is localized to specific regions of the optical spectrum. The system identifies peak portions and applies different correction strategies to peak regions versus non-peak regions, preserving peak sharpness while correcting baseline drift and other artifacts
3Ease of operation
If conventional correction processes are applied to narrow bandwidth light, then the measurement can be completed, but peak power discrepancies occur before and after correction
Solution Approach 1:
The patent implements a feedback mechanism where the system measures peak power before correction, performs adaptive correction, then verifies peak power after correction. If discrepancies are detected, the system iteratively adjusts correction parameters to minimize peak power changes, ensuring measurement accuracy
Solution Approach 2:
The system performs preliminary analysis of the optical spectrum to detect narrow bandwidth characteristics before applying correction. By identifying potential issues in advance and pre-adjusting correction parameters, the system prevents peak power discrepancies from occurring
Data Source
AI summary
A spectrum correction device includes an analyzer configured to analyze a shape of an optical spectrum obtained by measuring a light to be measured using spectrum data representing the optical spectrum, a corrector configured to perform a correction process according to the shape of the optical spectrum to the spectrum data based on an analysis result of the analyzer, and a synthesizer configured to synthesize the spectrum data corrected by the corrector.