Nonlinear Compensation Filter Tap Selection for Optical Systems
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Solution Overview
Problem
In high-speed optical communication systems, existing nonlinear compensation methods face challenges in achieving optimal performance while controlling power consumption, as the power consumption of filters for nonlinear compensation increases exponentially with memory length, making it difficult to effectively compensate for nonlinear effects in high-bandwidth scenarios.
Innovation Solution
A nonlinear compensation method and apparatus that determine the optimal coefficients and taps of a linear filter based on end-to-end channel linear response and hardware compensation ability, allowing for efficient nonlinear compensation by selectively opening and using fewer taps of the nonlinear compensation filter, thereby optimizing power consumption and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the memory length of the nonlinear compensation filter is increased to improve compensation performance, then the nonlinear compensation performance is improved, but the power consumption of the filter increases exponentially
Solution Approach 1:
The patent segments the nonlinear compensation filter into multiple parallel sub-filters, each processing a portion of the input signal. By dividing the filter into segments, the memory length requirement for each individual sub-filter is reduced while maintaining overall compensation performance. This segmentation approach allows the system to achieve effective nonlinear compensation with shorter memory lengths, thereby reducing the exponential power consumption growth associated with long memory filters.
2Use of energy by moving object
If the memory length of the nonlinear compensation filter is reduced to decrease power consumption, then the power consumption is reduced, but the nonlinear compensation performance deteriorates
Solution Approach 1:
The patent combines multiple parallel sub-filters with shorter memory lengths to achieve the equivalent compensation effect of a single long memory filter. By merging the outputs of these sub-filters, the system maintains high nonlinear compensation performance while each individual sub-filter operates with a reduced memory length, thereby lowering the overall power consumption. This merging approach allows the system to distribute the computational burden across multiple smaller units rather than requiring one large power-consuming filter.
3Use of energy by moving object
If a small numerical value for memory length n is used to control power consumption, then the power consumption is controlled, but the nonlinear compensation is unable to achieve expected effect in high-speed optical communication
Solution Approach 1:
The patent implements dynamic tap coefficient adjustment where the coefficients of the parallel sub-filters are adaptively optimized based on the input signal characteristics and channel conditions. This dynamic approach allows the system to achieve effective nonlinear compensation with shorter memory lengths by intelligently distributing the compensation task across multiple sub-filters with dynamically adjusted parameters. The dynamic optimization ensures that the compensation effect meets high-speed optical communication requirements while maintaining controlled power consumption through shorter memory lengths.
Data Source
AI summary
A nonlinear compensation method and apparatus and a system in a multicarrier optical communication system where the method includes: determining a coefficient of a linear filter in nonlinear compensation according to an end-to-end channel linear response of the system; determining taps of a nonlinear compensation filter needing to be opened and coefficients of the taps according to a hardware compensation ability of the system and the coefficient of the linear filter; and compensating for a nonlinear damage of the system by using the selected coefficients of the nonlinear compensation filter. With the method, apparatus or the system provided by this application, very good compensation performance may be achieved in a range of power consumption of the multicarrier optical communication system by only opening and using few taps of the compensation filter.