Optical Transmission Compensation Coefficients for Inter-Symbol Interference
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Solution Overview
Problem
In digital coherent optical communication, existing methods struggle to maintain signal quality due to inter-symbol interference and bandwidth limitations, leading to decreased transmission characteristics, particularly when excessive peaking characteristics are applied to compensate for high-frequency shortages.
Innovation Solution
An optical transmission and reception system that generates compensation coefficients to amplify specific frequency bands, using a combination of coefficients to balance signal quality by amplifying high-frequency and low-frequency bands, and applying these coefficients to pre-equalization and equalization circuits to compensate for losses in optical transmission apparatuses and lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If excessive peaking characteristics are applied to compensate for high-frequency shortages, then high-frequency signal quality is improved, but signal distortion and inter-symbol interference increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the peaking characteristics of the band characteristic. Instead of using excessive fixed peaking, the system optimizes the peaking parameters (frequency and amplitude) to achieve the minimum necessary compensation for high-frequency shortages while avoiding over-compensation that causes inter-symbol interference. This is implemented through controlled modification of the band characteristic parameters in the optical transmission apparatus.
Solution Approach 2:
The patent applies partial action by providing just enough peaking characteristic compensation to address the high-frequency shortage without excessive application. The system calculates and applies only the necessary degree of peaking to achieve adequate high-frequency signal quality while stopping short of the excessive peaking that would cause harmful inter-symbol interference effects.
2Adaptability or versatility
If peaking characteristics are applied to amplify high-frequency bands, then bandwidth coverage is improved, but signal quality decreases due to distortion
Solution Approach 1:
The system changes the parameter characteristics of the band characteristic by optimizing the peaking frequency and amplitude. This allows the system to achieve adequate bandwidth coverage for high-frequency signals while maintaining signal quality through controlled parameter adjustment that prevents excessive amplification and resulting distortion.
Solution Approach 2:
The patent applies partial action by providing just enough peaking characteristic to achieve the required bandwidth coverage without excessive application that would degrade signal quality. The optimization ensures sufficient high-frequency coverage while avoiding the harmful effects of over-amplification.
3Reliability
If compensation coefficients are applied to amplify low-frequency bands, then signal quality is improved, but high-frequency signal strength decreases
Solution Approach 1:
The patent applies local quality by providing frequency-selective compensation where needed. The band characteristic is designed to amplify specific frequency bands (low-frequency) while maintaining or appropriately shaping other frequency bands (high-frequency). This localized compensation approach improves overall signal quality in the low-frequency range without unnecessarily degrading high-frequency signal strength.
Solution Approach 2:
The system changes the frequency-dependent parameters of the band characteristic to achieve selective amplification. By adjusting the frequency response parameters, the system can amplify low-frequency components to improve signal quality while maintaining high-frequency signal strength through controlled parameter design that prevents excessive low-frequency amplification.
Data Source
AI summary
An optical transmission and reception system includes an optical transmission apparatus to acquire, in a frequency band of an electric data signal, from a first coefficient for amplifying an amplitude level of the frequency band in a high-frequency side, a partial coefficient that represents a negative portion of the amplitude level in the first coefficient, generate a second coefficient that reduces at least a part of the partial coefficient, generate a first compensation coefficient based on the first coefficient and the second coefficient, compensate for a loss that occurs in the optical transmission apparatus, based on the first compensation coefficient, and an optical reception apparatus to generate a second compensation coefficient based on a third coefficient and a fourth coefficient opposite to the second coefficient, and compensate for a loss that occurs in an optical transmission line, for the electric data signal, based on the second compensation coefficient.