Optical Transmission System Digital and Optical Filter Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In optical transmission systems, the emphasis on high-frequency regions by digital signal processing leads to increased peak-to-average power ratio and significant signal waveform deterioration due to electronic and optical noise, making it difficult to maintain satisfactory transmission characteristics over a wide band.
Innovation Solution
The implementation of a digital filter that compensates for ripple components and an optical filter that compensates for non-ripple components of the transmission characteristic, derived through convolution processing or averaging, to reduce signal waveform deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital signal processing emphasizes high frequency region to compensate for low-pass transmission characteristic, then transmission characteristics become flat from low frequency to high frequency, but peak-to-average power ratio increases and signal waveform deterioration becomes significant
Solution Approach 1:
The patent segments the transmission characteristic compensation into two distinct parts: ripple components (micro-fluctuating components) handled by digital filter and non-ripple components handled by optical filter. This segmentation allows each filter to address specific aspects of the transmission characteristic, preventing excessive high-frequency emphasis while maintaining flat transmission characteristics across the band.
Solution Approach 2:
The patent applies different compensation strategies to different frequency characteristics: digital filter addresses local micro-fluctuations (ripple components) while optical filter addresses broader non-ripple components. This local quality approach ensures that high-frequency regions receive appropriate compensation without excessive emphasis that would increase PAPR and cause waveform deterioration.
2Reliability
If digital signal processing emphasizes high frequency region, then flat transmission characteristics are achieved, but influence of electronic noise and optical noise becomes significant
Solution Approach 1:
By segmenting compensation between digital and optical filters, the system avoids excessive high-frequency amplification that would magnify noise. The optical filter provides gentle compensation for non-ripple components while digital filter handles only localized ripple components, together achieving flat transmission characteristics without excessive noise amplification.
Solution Approach 2:
The optical filter acts as an intermediary between the transmitter and digital signal processing, providing preliminary compensation for non-ripple components before signals undergo digital filtering. This intermediary approach distributes the compensation burden and prevents any single stage from excessively emphasizing high frequencies, thereby reducing noise influence.
Data Source
AI summary
An optical transmission system is an optical transmission system for transmitting a signal from an optical transmitter to an optical receiver via at least a transmission line among one or more optical nodes and the transmission line, wherein the optical transmitter includes a digital filter that compensates for, between ripple components that are micro-fluctuating components in a frequency region representing a transmission characteristic of the signal in the optical transmitter and the optical receiver and non-ripple components of the transmission characteristic, at least the ripple components of the transmission characteristic, and at least one of the optical node and the optical transmitter includes an optical filter that compensates for the non-ripple components of the transmission characteristic.