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Related Experiment Video

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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

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Low-complexity nonlinear equalizer based on absolute operation for C-band IM/DD systems.

Yukui Yu, Tianwai Bo, Yi Che

|July 17, 2020

Summary

This summary is machine-generated.

This study introduces a low-complexity nonlinear equalizer using absolute operations for intensity-modulation/direct-detection systems. It effectively compensates for distortions, matching Volterra nonlinear equalizers (VNLEs) performance while significantly reducing complexity.

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Area of Science:

Optical Communications
Signal Processing

Background:

Intensity-Modulation/Direct-Detection (IM/DD) systems face nonlinear waveform distortions from fiber chromatic dispersion.
Volterra Nonlinear Equalizers (VNLEs) can mitigate these distortions but are complex to implement.

Purpose of the Study:

To propose and demonstrate a low-complexity nonlinear equalizer for cost-sensitive IM/DD systems.
To reduce the implementation complexity of nonlinear equalizers while maintaining performance.

Main Methods:

Developed a novel nonlinear equalizer utilizing an absolute operation to replace cross-beating product terms.
Evaluated the equalizer's performance in a 56-Gb/s 4-ary pulse amplitude modulation (PAM4) transmission system.

Main Results:

The proposed equalizer achieves performance comparable to a 2nd-order diagonally-pruned VNLE.
Implementation complexity is reduced by over 20% compared to VNLEs.
Outperforms VNLEs when implementation complexities are similar.

Conclusions:

The absolute-operation-based nonlinear equalizer offers a cost-effective solution for IM/DD systems.
This approach significantly lowers hardware complexity without sacrificing performance.
Provides a viable alternative to traditional VNLEs for high-speed optical communications.