Optical Receiver Equalization for Residual Dispersion Slope
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Solution Overview
Problem
In wavelength division multiplexing optical transmission systems, accurately compensating for chromatic dispersion and dispersion slope is challenging due to unknown or varying types and lengths of optical fibers, leading to deteriorated transmission characteristics.
Innovation Solution
An optical receiver with a dispersion compensation circuit, adaptive equalization circuit, and monitor circuit that compensates for chromatic dispersion and residual dispersion based on monitored dispersion slope, using adaptive equalization and tap coefficients to improve compensation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If dispersion compensation is performed using fixed parameters, then the compensation process is simple, but the transmission characteristics deteriorate due to unknown or varying fiber types and lengths
Solution Approach 1:
The patent applies dynamics by transitioning from fixed dispersion compensation parameters to adaptive parameters that automatically adjust according to actual transmission conditions. The equalization circuit dynamically modifies compensation parameters based on monitor values to match varying fiber characteristics, resolving the contradiction between simple fixed processing and reliable adaptive compensation.
Solution Approach 2:
The patent implements feedback through the monitor circuit that continuously measures transmission quality and feeds this information back to the equalization circuit. This closed-loop system enables automatic adjustment of dispersion compensation parameters based on actual performance, ensuring reliable transmission characteristics while maintaining manageable system complexity.
2Measurement precision
If adaptive equalization is used to compensate for residual dispersion, then compensation accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies self-service through the adaptive equalization circuit that automatically adjusts its own parameters without external intervention. The circuit uses monitor values to self-optimize compensation performance, achieving high accuracy while the automated nature prevents excessive complexity from manual configuration requirements.
Solution Approach 2:
The patent utilizes parameter changes by dynamically modifying equalization parameters based on monitor values from the transmission line. This allows the system to adapt to varying dispersion conditions through parameter adjustment rather than structural complexity, improving accuracy while maintaining manageable device complexity.
Data Source
AI summary
An optical receiver includes a dispersion compensation circuit that compensates for chromatic dispersion of an optical transmission line, for an electric signal corresponding to an optical signal received through the optical transmission line, an adaptive equalization circuit that adaptively compensates for residual chromatic dispersion remaining due to insufficient compensation in the dispersion compensation circuit, for a compensated electric signal by the dispersion compensation circuit, and a monitor circuit that monitors a dispersion slope of the residual chromatic dispersion based on a tap coefficient of the adaptive equalizer circuit. The dispersion compensation circuit compensates for the chromatic dispersion based on a monitor value of the dispersion slope.