Optical Receiver Equalization for Distortion Accuracy vs Power
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Solution Overview
Problem
Existing coherent optical receivers face challenges in balancing the number of tap stages in digital filters to ensure accurate compensation for signal distortion while minimizing power consumption, as reducing tap stages compromises compensation accuracy and increasing stages increases power consumption.
Innovation Solution
Implementing a dual-compensation mechanism with a fixed compensator (FEQ) and an adaptive compensator (AEQ) in the optical receiver, where a controller calculates and updates tap coefficients to adaptively compensate for signal distortion, using a separate calculator and updater to fine-tune the fixed compensator's coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of tap stages in the adaptive equalizer is increased, then signal distortion compensation accuracy is improved, but power consumption increases
Solution Approach 1:
The patent divides the adaptive equalizer into multiple independent adaptive equalization units, each with its own tap coefficients. This segmentation allows the system to distribute the computational load across multiple smaller units rather than requiring one large equalizer, enabling more efficient power management while maintaining compensation accuracy.
Solution Approach 2:
The patent implements dynamic adjustment of tap coefficients through iterative updates during the equalization process. The tap coefficients are continuously refined based on feedback from the received signal, allowing the system to adapt to changing channel conditions without requiring a fixed large number of tap stages from the beginning.
2Use of energy by moving object
If the number of tap stages in the adaptive equalizer is reduced, then power consumption decreases, but signal distortion compensation accuracy deteriorates
Solution Approach 1:
The patent incorporates feedback mechanisms where the output of each adaptive equalization unit is monitored and used to adjust the tap coefficients of subsequent units. This feedback loop enables the system to achieve high compensation accuracy with fewer tap stages per unit, as the iterative refinement process compensates for the reduced number of stages.
Solution Approach 2:
The patent ensures continuous equalization processing through multiple sequential adaptive equalization units. Rather than relying on a single large equalizer, the system maintains continuous signal processing across multiple stages, each contributing to the overall compensation accuracy while consuming less power individually.
Data Source
AI summary
An optical receiver includes a receiver to receive an optical signal, a convertor to convert an electrical analog signal into a digital signal, a first compensator to fixedly compensate for a first signal distortion of the digital signal based on a first tap coefficient, a second compensator to adaptively compensate for a second distortion of the digital signal that has been compensated by the first compensator, based on a second tap coefficient with a second tap stage number different from a first tap stage number of the first compensator, and a controller to acquire the digital signal output from the first compensator before being input to the second compensator, calculate a third tap coefficient that adaptively compensates for the second signal distortion with the first tap stage number, and update the first tap coefficient of the first compensator based on the first tap coefficient and the third tap coefficient.