Hybrid MIMO Equalizer Circuit for Optical Signal Crosstalk Reduction
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Solution Overview
Problem
In high-capacity optical transmission systems, the increase in circuit size on the receiving side is a challenge due to the need for MIMO processing of subcarrier signals, particularly when the number of subcarriers to be multiplexed increases, leading to increased crosstalk and degradation of signal quality.
Innovation Solution
The implementation of a hybrid MIMO equalizer that combines frequency-domain MIMO equalizers and time-domain MIMO equalizers to perform MIMO equalization processing, reducing the circuit size by optimizing filter coefficients and tap numbers, thereby minimizing the increase in circuit size while effectively compensating for crosstalk and waveform distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of subcarrier signals to be multiplexed is increased, then the transmission capacity is improved, but the circuit size on the receiving side increases
Solution Approach 1:
The patent divides the MIMO equalization processing into two separate stages: frequency-domain MIMO equalization and time-domain MIMO equalization. This segmentation allows the system to handle multiple subcarriers more efficiently by processing them in distinct domains, thereby reducing the overall circuit size required on the receiving side while maintaining high transmission capacity
Solution Approach 2:
The patent transitions from single-domain processing to dual-domain processing by introducing both frequency-domain and time-domain MIMO equalization. This dimensional change enables the system to optimize circuit architecture by distributing processing functions across different domains, reducing the complexity and size of individual processing circuits while handling increased numbers of multiplexed subcarriers
2Productivity
If the number of subcarrier signals to be multiplexed is increased, then the transmission capacity is improved, but the crosstalk between subcarriers increases
Solution Approach 1:
The patent segments crosstalk compensation into two distinct processing stages: frequency-domain MIMO equalization for initial crosstalk reduction and time-domain MIMO equalization for residual crosstalk elimination. This segmented approach enables effective crosstalk suppression even when multiple subcarriers are multiplexed, maintaining signal quality while increasing transmission capacity
Solution Approach 2:
The patent introduces frequency-domain MIMO equalization as an intermediary processing stage between signal reception and time-domain equalization. This intermediate frequency-domain processing effectively reduces crosstalk before the time-domain stage, enabling the system to handle densely multiplexed subcarriers with minimal crosstalk interference
Data Source
AI summary
An optical signal processing circuit (1) includes: an FDE-MIMO equalizer (2) configured to generate, based on continuous subcarrier signals including a target subcarrier signal in an optical multicarrier signal to be received, the continuous subcarrier signals that have been subjected to frequency-domain MIMO equalization processing; and a TDE-MIMO equalizer (3) configured to generate, based on the continuous subcarrier signals that have been subjected to the frequency-domain MIMO equalization processing, the target subcarrier signal that has been subjected to time-domain MIMO equalization processing.